# DevToolLab

> DevToolLab (https://devtoollab.com) is a free library of 870 online developer tools and 218 hands-on guides and tool comparisons, written for working software developers in the United States. Most tools run entirely in the browser with no signup.

## About this site
- Tool pages describe what each tool does, its input and output formats, and its limits. Use the tool page as the source for tool behavior.
- Blog posts are dated. Comparison posts list vendor pricing and figures as published on the vendor's own pages on the date shown; check the "updated" date before quoting a number.
- Canonical URLs have no trailing slash. When citing, link the specific tool or article URL rather than the homepage.
- Contact and corrections: https://devtoollab.com/contact

## Articles (218, newest first within each category)

### Best Practices
- [AI Image Editor for Stale Doc Screenshots](https://devtoollab.com/blog/ai-image-editor-documentation-screenshots): Why documentation screenshots go stale, which ones to keep, how to redact keys and emails without blurring, and where an AI Image Editor speeds up a refresh. (updated 2026-10-21)
- [XML to JSON Conversion: Best Practices and Common Pitfalls](https://devtoollab.com/blog/xml-to-json-conversion-best-practices): Master XML to JSON conversion with expert tips, avoid common mistakes, and learn how to handle complex XML structures effectively in your applications. (updated 2026-03-08)

### Community
- [DevToolLab Discord Server is Now Live - Join the Free Developer Tools Community](https://devtoollab.com/blog/devtoollab-discord-community): Join the DevToolLab Discord server, a free community for developers using browser-based tools. Get help, suggest new tools, and stay updated on new releases. (updated 2026-06-15)

### Database
- [SQL Formatting Best Practices: An Engineer's Guide to Clean Queries](https://devtoollab.com/blog/sql-formatting-best-practices): Stop writing spaghetti SQL. Learn the engineering standards for query formatting, CTE structure, and how to write database queries that your team can actually debug. (updated 2026-03-16)

### Encoding
- [Base64 Encoding Explained: Complete Guide for Developers](https://devtoollab.com/blog/base64-encoding-explained): Learn everything about Base64 encoding and decoding, including use cases, implementation, and best practices for web development. (updated 2026-03-04)

### Engineering
- [How to Port Forward a Minecraft Server](https://devtoollab.com/blog/minecraft-port-forwarding-guide): Port forward a Minecraft server on TCP 25565, or skip the router entirely with Pinggy, Playit.gg and WireGuard tunnels when CGNAT blocks you. (updated 2026-09-19)

### General
- [Meta Muse Image Explained: How It Compares to GPT Image 2 and Nano Banana 2](https://devtoollab.com/blog/meta-muse-image-explained): Meta Muse Image ranks #2 on Arena, beating Nano Banana 2 and Grok Imagine - how it works, how it compares to GPT Image 2, and why there's no developer API yet. (updated 2026-07-08)
- [Claude Fable 5 Shutdown: US Export Control Order Explained for Developers](https://devtoollab.com/blog/claude-fable-5-shutdown): Anthropic disabled Claude Fable 5 and Mythos 5 three days after launch due to a US export control order. What happened, why, and how to migrate your API to Opus 4.8 right now. (updated 2026-06-14)

### Guide
- [5 Devin Alternatives for Teams in 2026](https://devtoollab.com/blog/devin-alternatives): Factory, Codex, Copilot, Claude Code and OpenHands compared with Devin on where the agent runs, how long a task can go and what five seats cost. (updated 2026-10-25)
- [Qwen3.8 27B VRAM Requirements, Measured](https://devtoollab.com/blog/qwen3-8-27b-vram-requirements): Qwen3.8 27B at Q4_K_M needs 23.74 GB of GPU memory for 128K tokens with a q8_0 cache. llama.cpp's own plan for 16, 24 and 32 GB GPUs. (updated 2026-10-24)
- [AWS Secrets Manager vs Parameter Store](https://devtoollab.com/blog/aws-secrets-manager-vs-parameter-store): Parameter Store SecureString or Secrets Manager for OpenAI and Anthropic keys on AWS: limits, rotation, Lambda caching, and the keyless STS option. (updated 2026-10-23)
- [AI Support Chatbot Cost: Buy vs Build](https://devtoollab.com/blog/customer-support-chatbot-cost): Intercom Fin, Zendesk AI agents and a custom GPT-5.4 Mini bot priced at 10,000 support chats a month, plus the volume where building your own pays off. (updated 2026-10-23)
- [Human-in-the-Loop AI Marketing Workflows](https://devtoollab.com/blog/human-in-the-loop-ai-marketing): AI marketing agents can research and draft alone, but anything public should wait for a person. A six-step approval workflow, review checklist and permissions. (updated 2026-10-23)
- [GDPR Compliant Employee Monitoring Tools](https://devtoollab.com/blog/gdpr-compliant-employee-monitoring-software): Apploye is the best GDPR compliant employee monitoring software for dev teams in 2026. Compare 6 tools on DPA, privacy controls, pricing, and developer fit. (updated 2026-10-22)
- [Claude Prompt Caching Pricing in 2026](https://devtoollab.com/blog/prompt-caching-guide): Claude prompt caching pricing for Opus 5.5, Sonnet 5.5 and Haiku 5.5, OpenAI GPT-6 cache-write fees, Gemini storage, and the hit rate where caching pays off. (updated 2026-10-22)
- [AI Agent Memory Platforms Compared: Mem0, Zep, Letta, GoodMem and Open Source](https://devtoollab.com/blog/ai-agent-memory-platforms): Mem0, Zep, Letta and GoodMem compared on memory model, pricing, benchmarks and self-hosting, plus the Apache-2.0 and MIT options worth running yourself. (updated 2026-10-21)
- [Best HR Software for UK Enterprise (1000+)](https://devtoollab.com/blog/best-hr-software-uk-enterprise): Nine HR platforms ranked for UK companies past 1,000 employees, from HiBob to Workday, SAP SuccessFactors and Oracle, on scale, security and UK payroll. (updated 2026-10-19)
- [Gemini Code Assist vs Antigravity in 2026](https://devtoollab.com/blog/gemini-code-assist-vs-antigravity): Google stopped selling Gemini Code Assist on October 9, 2026. The renewal deadlines, what Antigravity changes, seat costs, and a tested Gemini CLI migration. (updated 2026-10-18)
- [7 Best NotebookLM Alternatives in 2026](https://devtoollab.com/blog/notebooklm-alternatives): NotebookLM is now Gemini Notebook. ChatGPT, Claude and Copilot projects plus Open Notebook, SurfSense, AnythingLLM and kotaemon, tested on 32 RFCs. (updated 2026-10-18)
- [REA: AI Reverse Engineering Tool, Tested](https://devtoollab.com/blog/rea-reverse-engineer-anything): REA, the 304k-star reverse engineering repo, rebuilt all 121 bridge members of an Electron app exactly, then missed a webview override. GhidraMCP compared. (updated 2026-10-18)
- [ElevenLabs Alternatives in 2026, Priced](https://devtoollab.com/blog/elevenlabs-alternatives): 1M characters in a cloned voice costs $80 on Eleven v4. Cartesia, Fish Audio, Murf, Deepgram, Rime, Google, Chatterbox and Kokoro priced on the same job. (updated 2026-10-18)
- [LangChain Alternatives in 2026: 7 Tested](https://devtoollab.com/blog/langchain-alternatives): A one-tool LangChain agent installs 44 packages. Pydantic AI, LlamaIndex, Haystack, DSPy, OpenAI Agents SDK, Vercel AI SDK and Mastra measured the same way. (updated 2026-10-18)
- [7 Best Manus AI Alternatives in 2026](https://devtoollab.com/blog/manus-alternatives): Manus charges $20 for 4,000 credits. ChatGPT Work, Claude, Perplexity Computer, Genspark, DeerFlow, OpenManus and Kortix compared on price and self-hosting. (updated 2026-10-18)
- [Best Amazon S3 Clients for Mac and Windows](https://devtoollab.com/blog/amazon-s3-clients): CloudMounter, Cyberduck, Mountain Duck, Transmit, FileZilla Pro and CS Browser compared for managing Amazon S3 buckets on Mac and Windows. (updated 2026-10-17)
- [7 Best Deno Deploy Alternatives in 2026](https://devtoollab.com/blog/deno-deploy-alternatives): Deno Deploy shuts down six months after the Cloudflare deal. Workers, Supabase, Netlify, Fly.io, Val Town, Vercel and self-hosted workerd compared. (updated 2026-10-17)
- [8 Best Granola Alternatives in 2026](https://devtoollab.com/blog/granola-alternatives): Bot-free notes are now standard. Otter, Fireflies, Fathom, Bluedot, Notion and local Anarlog, Meetily and Foresight compared on where your audio goes. (updated 2026-10-17)
- [AI Taste Skills: Taste Skill vs Impeccable](https://devtoollab.com/blog/ai-taste-skills): Taste Skill, Impeccable, Anthropic frontend-design, Emil Kowalski's skills and Hallmark compared, with both slop checkers run on one generic page. (updated 2026-10-16)
- [Best GEO and AEO Tools in 2026, Compared](https://devtoollab.com/blog/best-geo-aeo-tools): Which AI engines Otterly.AI, Ahrefs Brand Radar, Peec AI, Profound, Semrush, Scrunch, AthenaHQ, HubSpot AEO and Elmo track, for how many prompts. (updated 2026-10-16)
- [Best Flowise Alternatives in 2026](https://devtoollab.com/blog/flowise-alternatives): Flowise was archived on August 13, 2026. Keelflow, Langflow, Dify, n8n, Sim, Activepieces and StackAI compared on license, self-hosting, RAG and MCP. (updated 2026-10-16)
- [n8n Alternatives for AI Workflows in 2026](https://devtoollab.com/blog/n8n-alternatives): One AI workflow at 10,000 runs a month: $129 on Dify, $136 on n8n, $489 on Zapier. Make, Activepieces, Windmill and Gumloop priced the same way. (updated 2026-10-15)
- [Stripe Alternatives in 2026: Fees Compared](https://devtoollab.com/blog/stripe-alternatives): A $49,000 month costs $1,818 on Stripe. Braintree, Square, Airwallex, Authorize.net, Adyen, Helcim, Finix and Hyperswitch priced on the same charges. (updated 2026-10-15)
- [Supabase Alternatives for AI Apps in 2026](https://devtoollab.com/blog/supabase-alternatives): 500,000 embeddings turn Supabase's $25 plan into $225 a month. InsForge, Appwrite, Firebase, Neon, Convex, Nhost and PocketBase priced on the same AI app. (updated 2026-10-15)
- [8 Best Firecrawl Alternatives in 2026](https://devtoollab.com/blog/firecrawl-alternatives): 20,000 docs pages to Markdown costs $94 on Firecrawl. Jina Reader, Exa, Tavily, Spider, Browserbase, ScrapeGraphAI, Crawl4AI and self-hosting, same job. (updated 2026-10-14)
- [7 Best Ollama Alternatives in 2026](https://devtoollab.com/blog/ollama-alternatives): Ollama ran 7 to 9 percent slower than llama.cpp on the same model in our M3 Pro test. llama.cpp, LM Studio, vLLM, Jan, LocalAI, Docker and MLX LM compared. (updated 2026-10-14)
- [8 Best Cursor Alternatives in 2026](https://devtoollab.com/blog/cursor-alternatives): Cursor's new X Subscription bills Claude and GPT at API rates. Claude Code, Copilot, Codex, Devin Desktop, Antigravity, Zed, Cline and Kiro compared. (updated 2026-10-13)
- [Best MCP Security Tools in 2026](https://devtoollab.com/blog/best-mcp-security-tools): We ran Cisco MCP Scanner and NVIDIA SkillSpector on a poisoned MCP server and put agentgateway in front of it. Plus Snyk, Docker, IBM, Obot and Runlayer. (updated 2026-10-12)
- [LLM API Outages in 2026: 90 Days of Data](https://devtoollab.com/blog/llm-api-outages): OpenAI's API had incidents open 72.7 hours and Anthropic's 76.5 hours in 90 days, but only 36 minutes overlapped. Data from 12 status pages, with a free CSV. (updated 2026-10-12)
- [11 Best Webhook.site Alternatives (2026)](https://devtoollab.com/blog/best-webhook-site-alternatives): Webhook.site free URLs expire in 7 days. DevToolLab, Smee.io, Beeceptor, Hookdeck, Svix Play, ngrok and self-hosted testers compared on free limits and price. (updated 2026-10-11)
- [Best AI Video Editors for Developers](https://devtoollab.com/blog/best-ai-video-editors-for-developers): Descript, DaVinci Resolve, Shotstack, Remotion and auto-editor compared for product demos and code-driven video, with prices, licenses and a tested auto-cut. (updated 2026-10-10)
- [Best HubSpot Alternatives for Developers](https://devtoollab.com/blog/hubspot-alternatives-for-developers): HubSpot, Attio, Twenty, Close and EspoCRM compared on published API limits, webhooks, licenses and per-seat prices, plus how long a 50,000-record sync takes. (updated 2026-10-09)
- [Best Bolt.new Alternatives in 2026](https://devtoollab.com/blog/bolt-new-alternatives): Lovable, v0, Replit, Base44, Dyad, bolt.diy compared on October 2026 prices: tokens versus credits, per-seat versus flat plans, and what a 4-person team pays. (updated 2026-10-08)
- [Best Text-to-Speech APIs in 2026, Compared](https://devtoollab.com/blog/best-text-to-speech-apis): ElevenLabs, Qwen, Cartesia, Inworld, Speechify, MiniMax, Fish Audio, Google and Azure TTS APIs ranked by blind tests and priced on one 5M-character workload. (updated 2026-10-06)
- [n8n vs Zapier vs Make: AI Automation 2026](https://devtoollab.com/blog/n8n-vs-zapier-vs-make): n8n, Zapier and Make priced on one AI ticket-triage workflow: tasks vs credits vs executions, plus Activepieces, Windmill, Node-RED and OpenClaw. (updated 2026-10-06)
- [Best CodeRabbit Alternatives 2026: AI Code Review Tools Compared](https://devtoollab.com/blog/coderabbit-alternatives): CodeRabbit works for most teams -- but not all. Compare Greptile, Qodo Merge, Cursor BugBot, and GitHub Copilot Code Review with real pricing benchmarks. (updated 2026-10-06)
- [Best AI Release Management Tools in 2026: Which Ones Actually Roll Back](https://devtoollab.com/blog/best-ai-release-management-tools): Harness AI Verification, Octopus Deploy Recovery Agent, LaunchDarkly guarded rollouts and Statsig compared on what their AI does when a deploy goes wrong, plus the open-source controllers that revert a release on their own: Argo Rollouts and Flagger. (updated 2026-10-05)
- [Best SQL Clients in 2026: 8 Tools Compared](https://devtoollab.com/blog/best-sql-clients): DBeaver, DataGrip, Beekeeper Studio, TablePlus, DbGate, DbVisualizer, Chat2DB and VS Code's MSSQL extension, priced for a five-developer team. (updated 2026-10-04)
- [9 Open Source Claude Code Alternatives](https://devtoollab.com/blog/open-source-alternatives-claude-code): OpenCode, Codex CLI, Pi, Gemini CLI, OpenHands, Cline, Goose, Aider and Qwen Code compared on license, stars, model access and free options, October 2026. (updated 2026-10-04)
- [5 Best Self-Hosted VPN Servers in 2026](https://devtoollab.com/blog/best-self-hosted-vpn): WireGuard, WG-Easy, Headscale, NetBird and AmneziaVPN compared on web UI, mesh, license and current version, with Docker setup for a homelab or a team. (updated 2026-10-04)
- [Self-Host Open Source AI Image Generators](https://devtoollab.com/blog/open-source-ai-image-generators-self-host): Open source AI image generators you can self-host: Z-Image-Turbo, FLUX.2, Krea 2, Qwen-Image and more, with verified licenses and real VRAM numbers. (updated 2026-10-04)
- [What Is an Agent Harness? Pi 1.0 Explained](https://devtoollab.com/blog/what-is-an-agent-harness): An agent harness is the loop, tools, permissions and context around a model. Watch Pi 1.0 run one, then compare Claude Code, Codex, OpenCode and DeepSeek. (updated 2026-10-03)
- [Best AI Penetration Testing Tools in 2026](https://devtoollab.com/blog/best-ai-penetration-testing-tools): Aikido, XBOW, NodeZero, RunSybil, Strix, Shannon and PentAGI compared on published prices, licenses and the one third-party head-to-head test of 2026. (updated 2026-10-02)
- [Git SHA-256: What Changes in Git 3.0](https://devtoollab.com/blog/git-sha256): Git 3.0 makes SHA-256 the default for new repos, with no release date yet. Check your repo's hash, create a SHA-256 repo, and see what breaks on GitHub. (updated 2026-10-02)
- [Kafka Alternatives in 2026: Costs Compared](https://devtoollab.com/blog/kafka-alternatives): Cloudflare K2, Redpanda, WarpStream, AutoMQ, Amazon MSK, Pulsar and NATS compared on one 5 MB/s workload using each vendor's published rates. (updated 2026-10-02)
- [Best AI Search APIs for Agents in 2026](https://devtoollab.com/blog/best-ai-search-apis): Exa, Tavily, Brave, Parallel, Perplexity and Serper priced on one workload of 100,000 agent searches a month, plus self-hosted SearXNG. (updated 2026-09-30)
- [GitHub Actions Runners: What Faster Costs](https://devtoollab.com/blog/ci-acceleration-services): Blacksmith, Ubicloud, Namespace and Depot priced against GitHub's per-minute rates on one workload, plus self-hosted RunsOn, ARC and Zoomies. (updated 2026-09-29)
- [Playwright vs Cypress vs Selenium in 2026](https://devtoollab.com/blog/playwright-vs-cypress-vs-selenium): Playwright, Cypress and Selenium compared on stars and downloads, plus what BrowserStack, Sauce Labs and TestMu AI charge to run them in CI. (updated 2026-09-28)
- [Best API Documentation Platforms in 2026](https://devtoollab.com/blog/best-api-documentation-platforms): Mintlify, ReadMe, Stoplight, Redocly and Scalar priced on what a custom domain and white-labeling cost, plus Swagger UI, the open-source core under most. (updated 2026-09-27)
- [Webhook vs API: What's the Difference?](https://devtoollab.com/blog/webhooks-vs-api): An API answers when you ask; a webhook calls your URL when an event happens. Cost, latency, security and failure handling compared, with runnable code. (updated 2026-09-27)
- [Best WAF and Bot Detection Tools in 2026](https://devtoollab.com/blog/best-waf-bot-detection-tools): Cloudflare, DataDome, HUMAN Security and Akamai compared on real pricing and behavior, plus CrowdSec, the open-source WAF that costs nothing to self-host. (updated 2026-09-26)
- [Developer Tools Pricing Index 2026](https://devtoollab.com/blog/developer-tools-pricing-index): 161 published prices for 76 products in 10 categories, each checked on September 26, 2026, with a free CSV. The same workload costs up to 36x more. (updated 2026-09-26)
- [Best Distributed Tracing Tools in 2026](https://devtoollab.com/blog/best-distributed-tracing-tools): Jaeger, Grafana Tempo, SigNoz, Honeycomb, Datadog, Dash0 and AWS X-Ray priced on the same sampled trace volume, using a span size we measured. (updated 2026-09-26)
- [Best Log Management Tools in 2026: Costs](https://devtoollab.com/blog/best-log-management-tools): Datadog, Grafana Cloud, Elastic and Better Stack priced on the same 500 GB of logs, plus the open source engines: Loki, OpenSearch, Graylog and VictoriaLogs. (updated 2026-09-26)
- [Best API Gateways in 2026: Costs Compared](https://devtoollab.com/blog/best-api-gateways): Kong, Traefik, Apache APISIX, KrakenD, Tyk and Amazon API Gateway compared on the prices their own pages publish, with a script that prices your own traffic. (updated 2026-09-26)
- [Firebase Alternatives in 2026, Priced](https://devtoollab.com/blog/firebase-alternatives): Supabase, Appwrite, Convex and PocketBase priced against Firebase on one app, with licenses and versions as of September 2026. One of them is not open source. (updated 2026-09-26)
- [Best CI/CD Tools in 2026: What They Really Cost and When to Self-Host](https://devtoollab.com/blog/best-ci-cd-tools): GitHub Actions, GitLab CI, CircleCI and Buildkite compared on the prices their own pages publish, plus the open-source engines worth self-hosting: Jenkins, Semaphore CE, Woodpecker and Argo CD. (updated 2026-09-26)
- [8 Best Video Caption APIs for Social Media](https://devtoollab.com/blog/video-caption-apis-social-media): ZapCap, Shotstack, Creatomate, Bannerbear, ReelWords, Veed, fal and Submagic compared for captioning social media video at scale, from pricing to languages. (updated 2026-09-25)
- [Best Secret Scanning Tools in 2026, Tested](https://devtoollab.com/blog/best-secret-scanning-tools): Gitleaks, Betterleaks, TruffleHog and Kingfisher run against one seeded repo, plus what GitHub Secret Protection and GitGuardian actually charge. (updated 2026-09-24)
- [Building a Content Moderation Pipeline That Catches AI-Generated Spam](https://devtoollab.com/blog/content-moderation-pipeline-ai-generated-spam): Wondering how to counter AI-generated spam? Find out some viable steps to build an impactful content moderation pipeline that catches AI-generated spam. (updated 2026-09-23)
- [Turborepo vs Nx: Best Monorepo Tools 2026](https://devtoollab.com/blog/best-monorepo-management-tools): Turborepo vs Nx compared on caching, CI speed and pricing, with pnpm Workspaces, Lerna and Bazel, plus the setup that gets a monorepo running in 10 minutes. (updated 2026-09-23)
- [Best Usage-Based Billing Platforms 2026](https://devtoollab.com/blog/best-usage-based-billing-platforms): Stripe bought Metronome and Adyen bought Orb in 2026. The metered billing options that are still independent, with verified prices, licenses and versions. (updated 2026-09-22)
- [Best DAST Tools in 2026: Prices Compared](https://devtoollab.com/blog/best-dast-tools): ZAP, Nuclei, Wapiti, Burp Suite, StackHawk and Detectify compared on the prices their own pages publish, with licenses and versions checked September 2026. (updated 2026-09-21)
- [11 Best Ngrok Alternatives for 2026](https://devtoollab.com/blog/best-ngrok-alternatives): Compare 11 Ngrok alternatives for local tunneling: Cloudflare Tunnel, Localtunnel, frp, bore, sish and more. Free tiers, licenses and self-hosted setups. (updated 2026-09-21)
- [System One Models vs LLM JSON in 2026](https://devtoollab.com/blog/system-one-models-typed-decisions): TypeSafe's Jev answers in 70 to 500 ms and Convai's Laya is Apache 2.0 on your own GPU. When a typed decision model beats constrained JSON from an LLM. (updated 2026-09-20)
- [Webpack Alternatives in 2026, Benchmarked](https://devtoollab.com/blog/webpack-alternatives): esbuild, Rspack, Vite with Rolldown and Turbopack benchmarked against webpack on the same module graph, with versions and licenses as of September 2026. (updated 2026-09-20)
- [9 Supply Chain Security Tools in 2026](https://devtoollab.com/blog/supply-chain-security-tools): One npm dependency pulls in 67 packages. Syft, Grype, Trivy, Cosign, OSV-Scanner, Dependency-Track, Snyk, Chainguard and Socket, with real versions and prices. (updated 2026-09-19)
- [6 Best Opsgenie Alternatives (2026)](https://devtoollab.com/blog/best-opsgenie-alternatives): Opsgenie shuts down April 5, 2027. PagerDuty, incident.io, Rootly, FireHydrant, Jira Service Management and open-source Keep compared on price and migration. (updated 2026-09-18)
- [Generative Engine Optimization (GEO) for Developers: Get Cited by ChatGPT, Perplexity, and Claude in 2026](https://devtoollab.com/blog/generative-engine-optimization-guide): Allow the right AI crawlers, publish llms.txt and structure pages so ChatGPT, Perplexity and Claude cite you. With a verified user-agent table. (updated 2026-09-18)
- [7 Fastest DNS Servers for Gaming (2026)](https://devtoollab.com/blog/best-dns-for-gaming): Cloudflare, Google, Quad9, OpenDNS and AdGuard compared on speed, IPv6 and filtering, plus the honest answer on whether DNS lowers your in-game ping. (updated 2026-09-18)
- [Best Uptime Monitoring Tools in 2026](https://devtoollab.com/blog/best-uptime-monitoring-tools): UptimeRobot, Better Stack, Checkly and Cronitor priced from their own pages, plus the open-source options worth self-hosting: Uptime Kuma, Gatus and Upptime. (updated 2026-09-17)
- [11 Free Playit.gg Alternatives in 2026](https://devtoollab.com/blog/best-playit-gg-alternatives): Eleven free Playit.gg alternatives for Minecraft and game servers, compared on free-tier limits, TCP/UDP support and setup: Tailscale, ngrok, Pinggy, Aternos. (updated 2026-09-17)
- [Best Workflow Orchestration Tools in 2026](https://devtoollab.com/blog/best-workflow-orchestration-tools): Temporal, Inngest and Trigger.dev priced on one workload, days after Temporal's $550M raise at a $12.55B valuation, plus Hatchet, the open-source pick. (updated 2026-09-16)
- [Best GitOps Tools 2026: Argo CD vs Flux](https://devtoollab.com/blog/best-gitops-tools): Argo CD, Flux, Rancher Fleet and Sveltos compared on install footprint, who actually pays the maintainers, and what Akuity and Octopus charge on top. (updated 2026-09-15)
- [Best Database Migration Tools in 2026](https://devtoollab.com/blog/best-database-migration-tools): Flyway, Liquibase, Atlas, Bytebase, Prisma Migrate and Alembic compared on license, price and drift detection, after Liquibase left Apache 2.0. (updated 2026-09-14)
- [Cybersecurity Lab Gear for Students 2026](https://devtoollab.com/blog/cybersecurity-lab-gear-students): Kali runs in 2GB of RAM. Security Onion standalone wants 24GB and refuses to run on ARM. What a security student actually needs to buy, and what to skip. (updated 2026-09-14)
- [How LLM Tokenization Actually Works](https://devtoollab.com/blog/how-llm-tokenization-works): A model never sees letters. We built a real BPE tokenizer on OpenAI's published vocabularies and measured why strawberry, numbers and Hindi all go wrong. (updated 2026-09-14)
- [Local LLM Hardware: GPU vs Mac in 2026](https://devtoollab.com/blog/local-llm-hardware-gpu-vs-mac): An 8GB GPU fits none of today's useful local models. We measured real download sizes against real machines to find which hardware actually holds which model. (updated 2026-09-14)
- [OpenRouter: One Model, 33 Providers](https://devtoollab.com/blog/openrouter-provider-routing): A model slug on OpenRouter is not one deployment. We measured the public API: an 11x price spread and a 15x context spread inside a single model name. (updated 2026-09-14)
- [RAG Chunking Strategies, Measured](https://devtoollab.com/blog/rag-chunking-strategies): Fixed-size chunking splits a sentence at 98% of its boundaries. We ran four strategies over RFC 9562 and measured how much each one breaks. (updated 2026-09-14)
- [Rate Limiting Algorithms: 5 Compared](https://devtoollab.com/blog/rate-limiting-algorithms-compared): A fixed window lets exactly twice your limit through at the boundary. We ran five rate limiting algorithms on identical traffic and measured each one. (updated 2026-09-14)
- [Temperature vs Top-p in LLMs, Measured](https://devtoollab.com/blog/temperature-vs-top-p): Every provider says do not tune temperature and top_p together. We measured why: the same top_p setting allows 1 token at temp 0.2 and 5 at temp 1.8. (updated 2026-09-14)
- [UUIDv7 vs UUIDv4: 200,000 Rows Measured](https://devtoollab.com/blog/uuidv7-vs-uuidv4): We benchmarked UUIDv7 against UUIDv4 as a primary key over 200,000 rows. Inserts got faster and range scans got much faster. The index size claim did not hold. (updated 2026-09-14)
- [What Is a Webhook? Anatomy of One Request](https://devtoollab.com/blog/what-is-a-webhook): A webhook is one signed HTTP POST. Here is exactly what lands on your server, why every provider signs it, and what Stripe and Anthropic do when you are down. (updated 2026-09-14)
- [What Is AGENTS.md? Inside 24 Real Repos](https://devtoollab.com/blog/what-is-agents-md): AGENTS.md is a README for coding agents, used by 60k projects. We surveyed 24 well-known repos to see what teams actually put in one, and what they skip. (updated 2026-09-14)
- [What Is llms.txt? 24 Vendors Checked](https://devtoollab.com/blog/what-is-llms-txt): We checked 24 developer platforms for llms.txt. 20 serve one, but only 16 on the apex domain, and Google says it does not use the file at all. (updated 2026-09-14)
- [Best Offline LLM Models and Tools 2026](https://devtoollab.com/blog/top-5-local-llm-tools-models): Which offline LLM models actually run on your own hardware in 2026: Qwen3.8, Gemma 4, Phi-4 and Mistral Small, plus Ollama, LM Studio, Jan and LocalAI. (updated 2026-09-14)
- [Best Load Testing Tools in 2026 Compared](https://devtoollab.com/blog/best-load-testing-tools): k6, Gatling, Locust, JMeter and Artillery compared on the prices their own pages publish, plus which engines still ship releases and which have gone quiet. (updated 2026-09-13)
- [GPT-6 Astra: OpenAI's Riskiest Model Yet](https://devtoollab.com/blog/gpt-6-astra-explained): OpenAI GPT-6 Astra broken down for developers: real pricing, the 1M token context window, a code example, and the risk OpenAI flagged in its own system card. (updated 2026-09-13)
- [OpenAI Agents API: What You Actually Get](https://devtoollab.com/blog/openai-agents-api): OpenAI opened the Codex harness as a public beta API on September 10, 2026. What it manages, what the hosted sandbox costs, and when to keep your framework. (updated 2026-09-13)
- [Best Merchant of Record Platforms in 2026](https://devtoollab.com/blog/best-merchant-of-record-platforms): Paddle, Lemon Squeezy, Polar, Stripe Managed Payments and FastSpring compared on real fees, and why merchant of record has no open source alternative. (updated 2026-09-12)
- [7 Datadog Alternatives and What They Cost](https://devtoollab.com/blog/datadog-alternatives): Grafana Cloud, New Relic, Better Stack, Axiom, SigNoz, OpenObserve and VictoriaLogs priced against Datadog list rates on one identical workload, with the open source licenses and versions that actually ship. (updated 2026-09-10)
- [Open Source AI Coding Models vs Fable 5.1](https://devtoollab.com/blog/best-open-source-ai-coding-models): Kimi K3, DeepSeek V4 Pro, GLM-5.3, MiniMax M2.5 and Qwen3.8-27B compared on the benchmarks their own cards publish, and how close they get to Claude Fable 5.1. (updated 2026-09-09)
- [Best MCP Servers in 2026 for Claude, Cursor & VS Code](https://devtoollab.com/blog/best-mcp-servers): The best MCP servers for Claude Code, Cursor and VS Code, updated for the 2026-07-28 spec: setup, top picks, and which reference servers are now archived. (updated 2026-09-09)
- [Best eBPF Observability Tools in 2026: Zero-Code Instrumentation Compared](https://devtoollab.com/blog/ebpf-observability-tools): OpenTelemetry eBPF Instrumentation, Coroot, Odigos, Pixie and groundcover compared on license, version and published price, plus what eBPF genuinely cannot see and why SDKs are not going away. (updated 2026-09-08)
- [Understanding Measurement Conversion Made Easy](https://devtoollab.com/blog/understanding-measurement-conversion): Measurement conversion is not as complicated as it looks. A plain guide to length, weight, and temperature units, how decimal and binary number systems relate, and when to convert by hand instead of reaching for a tool. (updated 2026-09-06)
- [What Is SOC 2 Type 2? Scope and Period](https://devtoollab.com/blog/what-is-soc-2-type-2): A SOC 2 Type 2 report covers how controls operated across a period, not a single day. Here is what the AICPA standard actually requires, why no rule fixes the window at 12 months, and the 2026 warnings from the AICPA's own SOC 2 Working Group. (updated 2026-09-06)
- [Best AI Voice Agent Platforms in 2026: Vapi vs Retell vs Bland vs ElevenLabs Agents](https://devtoollab.com/blog/best-ai-voice-agent-platforms): Vapi, Retell, Bland, ElevenLabs Agents, LiveKit and Pipecat compared on live September 2026 pricing: the same minute of AI phone call runs $0.03 to $0.31 depending on who meters the model. (updated 2026-09-05)
- [Best Email API Providers in 2026: Resend vs Postmark vs SendGrid vs Amazon SES vs Mailgun](https://devtoollab.com/blog/best-email-api-providers): Resend, Postmark, SendGrid, Amazon SES, Mailgun, Mailtrap, Loops and the open-source Plunk and Postal compared on live September 2026 pricing, with a script that prices your real monthly volume. (updated 2026-09-05)
- [Best SOC 2 Compliance Automation Platforms in 2026: Vanta vs Drata vs Secureframe vs Sprinto](https://devtoollab.com/blog/best-soc2-compliance-automation-platforms): Vanta, Drata, Secureframe, Sprinto, Thoropass, Oneleet, Scytale and open-source Comp AI compared: what each publishes about pricing, who delivers the audit, and a script that checks your public SOC 2 evidence. (updated 2026-09-05)
- [Best Web Scraping APIs for AI in 2026: Firecrawl vs Apify vs Bright Data vs Zyte](https://devtoollab.com/blog/best-web-scraping-apis-for-ai): Firecrawl, Apify, Bright Data and Zyte priced against the same 100,000-page workload, plus Crawl4AI, the Apache 2.0 self-hosted option with 81,000+ GitHub stars, for teams feeding a RAG pipeline or AI agent. (updated 2026-09-03)
- [Container Security Tools Compared: Image Scanning, Runtime Defense, and Open-Source Picks](https://devtoollab.com/blog/container-security-tools): Container security splits into three jobs that no single tool does well. We tested Trivy, Grype, Falco, Tetragon and Kubescape against the paid platforms, with real scan output and current pricing. (updated 2026-09-02)
- [Best LaunchDarkly Alternatives in 2026: Unleash, GrowthBook, Flagsmith and OpenFeature Compared](https://devtoollab.com/blog/best-launchdarkly-alternatives): LaunchDarkly launched AgentControl for AI agents and dropped per-seat pricing for a connection-and-MAU meter. Unleash, GrowthBook, Flagsmith and the OpenFeature standard compared with verified pricing, licenses, and a working provider-swap demo. (updated 2026-08-31)
- [Spec-Driven Development in 2026: The Method Replacing Vibe Coding](https://devtoollab.com/blog/spec-driven-development-ai-agents): Vibe coding breaks at scale. Spec-Driven Development fixes it: write specs first, generate code second. GitHub Spec Kit, AWS Kiro, and workflow examples. (updated 2026-08-31)
- [Best Heroku Alternatives in 2026: Render, Railway, Fly.io and Open Source PaaS Compared](https://devtoollab.com/blog/best-heroku-alternatives): Salesforce moved Heroku to sustaining engineering in February 2026. Six alternatives compared with verified August 2026 pricing: Render, Railway, Fly.io, DigitalOcean App Platform, Coolify and Dokku, plus a runnable cost script. (updated 2026-08-29)
- [Best Sentry Alternatives in 2026: Open Source Error Tracking Compared](https://devtoollab.com/blog/best-sentry-alternatives): Six Sentry alternatives compared with verified August 2026 pricing: GlitchTip, Bugsink, Honeybadger, BugSnag, PostHog, and SigNoz. Real license terms, self-hosting footprints, and a runnable cost script. (updated 2026-08-28)
- [Best PDF Parsers for RAG in 2026: Open Source vs Managed APIs](https://devtoollab.com/blog/best-pdf-parsers-for-rag): A 0.9B open-weights model now outscores Gemini 3 Pro at reading documents. A developer's guide to the best PDF parsers for RAG in 2026 - Docling, MinerU, Marker, PaddleOCR-VL, LlamaParse and cloud OCR - with real pricing and license traps. (updated 2026-08-27)
- [How to Add 3D Camera Moves to AI-Generated Video](https://devtoollab.com/blog/add-3d-camera-moves-ai-generated-video): A camera move added to already-generated video is a different problem than generating one from scratch. The scene's geometry and subject placement are already fixed, so the move has to work with what is there. (updated 2026-08-26)
- [Best AI Code Search Tools in 2026: Sourcegraph vs Open Source](https://devtoollab.com/blog/best-ai-code-search-tools): Bloop shut down in April 2026 and its domain is now parked. A hands-on look at what is left in AI code search: Sourcegraph Deep Search at $16K, Greptile's pivot to code review, and Zoekt indexing 31,300 Kubernetes files in six seconds on a laptop. (updated 2026-08-26)
- [Best Background Coding Agents in 2026: Devin, Codex Cloud and Jules](https://devtoollab.com/blog/best-background-coding-agents): Jules gives you 15 free agent tasks a day, Devin Pro starts at $20, and Codex cloud is bundled into ChatGPT plans. A hands-on comparison of background coding agents in 2026, including the self-hosted open-source option. (updated 2026-08-26)
- [How to Maintain Product Consistency in AI-Generated Ads and Marketing Videos](https://devtoollab.com/blog/product-consistency-ai-generated-ads): A product that looks slightly different in every ad variant undermines a campaign faster than almost any other visual mistake, and at 50 variants that drift shows up dozens of times before anyone catches it. (updated 2026-08-26)
- [How to Maintain Voice and Audio Consistency Across AI-Generated Video Scenes](https://devtoollab.com/blog/voice-audio-consistency-ai-generated-video): A voice that shifts slightly between scenes is a quieter problem than a character's face changing, but it is just as noticeable once a viewer's ear catches it. (updated 2026-08-26)
- [Best RAG Platforms & Tools in 2026: Frameworks vs Managed Services](https://devtoollab.com/blog/best-rag-platforms-and-tools): RAG runs 51% of enterprise LLM deployments versus 9% for fine-tuning. A developer's honest guide to the best RAG platforms and tools in 2026 - LlamaIndex, Haystack, DSPy, Bedrock, Vertex, and the managed services replacing DIY pipelines. (updated 2026-08-26)
- [Best AI Video Generation Models in 2026: Runway, Veo, Wan & More](https://devtoollab.com/blog/best-ai-video-generation-models): A comprehensive developer guide to AI video generation in 2026. Compare Veo 3.1, Runway Gen-4.5, Kling 2.6, Wan 2.2, HunyuanVideo, and LTX-2 - covering output quality, hardware requirements, pricing, and open-source self-hosting options. (updated 2026-08-26)
- [Best AI Code Migration Tools in 2026 for Legacy Modernization](https://devtoollab.com/blog/best-ai-code-migration-tools): AWS Transform bills a 17,000-line Java upgrade at $2.52 in agent minutes. A hands-on comparison of AI code migration tools in 2026, from OpenRewrite and ast-grep to AWS Transform, Copilot app modernization, and vFunction. (updated 2026-08-25)
- [How to Create Movie-Style Opening Titles Without an Editor](https://devtoollab.com/blog/movie-style-opening-titles-without-editor): A cinematic opening title used to need a motion designer and a compositing timeline. What changed is that a text description can now do a meaningful part of what a designer's hand used to do. (updated 2026-08-25)
- [Best AI Inference Platforms in 2026: Modal vs Baseten vs Replicate vs Together AI](https://devtoollab.com/blog/best-ai-inference-platforms): Modal, Baseten, Replicate, and Together AI compared on verified August 2026 pricing: the same H100 runs $3.95 to $6.50 per hour, and the billing unit matters more than the sticker. (updated 2026-08-22)
- [Best GPU Cloud Providers for AI Workloads in 2026: CoreWeave vs Lambda vs RunPod](https://devtoollab.com/blog/best-gpu-cloud-providers): CoreWeave, Lambda, and RunPod compared on verified August 2026 pricing: the same H100 rents for $2.69 to $6.16 an hour, spot flips the ranking, and one of the three is already a public company. (updated 2026-08-22)
- [Best Authentication Providers in 2026: Auth0 vs Clerk vs WorkOS](https://devtoollab.com/blog/best-authentication-providers): Auth0, Clerk, and WorkOS compared on real August 2026 pricing, plus open-source options and working code. The free tiers are generous; the enterprise SSO connection is where the bill lands. (updated 2026-08-21)
- [Best Authorization and Permissions Tools in 2026: Fine-Grained Authz Compared](https://devtoollab.com/blog/best-authorization-permissions-tools): OpenFGA, SpiceDB, Cerbos, Cedar, Permit.io, and Apache Casbin compared on real pricing and architecture, with two engines run locally to show what relationship-based and policy-based authorization actually return. (updated 2026-08-21)
- [Best AI Code Review Tools in 2026: Tested & Ranked](https://devtoollab.com/blog/ai-code-review-tools): The best AI code review tools in 2026 -- from PR-level reviewers like CodeRabbit to IDE security scanners like Snyk. Tested and ranked for solo devs, startups, and enterprise teams. (updated 2026-08-20)
- [OWASP Top 10 for LLM Applications 2026: A Developer's Security Checklist](https://devtoollab.com/blog/owasp-top-10-llm-applications-checklist): OWASP released the 2026 edition of its Top 10 for LLM Applications on August 3, weighting real incident data for the first time. A risk-by-risk checklist with real attack scenarios and mitigation code for every entry, from Prompt Injection down to Improper Output Handling. (updated 2026-08-18)
- [Building an AI Code Interpreter: E2B and Modal Sandboxes in Python](https://devtoollab.com/blog/build-ai-code-interpreter-e2b-modal): A hands-on Python guide to running AI-generated code safely with E2B and Modal sandboxes, plus Piston, the open source engine whose free public API went whitelist-only in February 2026. Every example is checked against the real, currently installed SDKs. (updated 2026-08-16)
- [Best Serverless Postgres in 2026: Neon, Supabase and What Scale-to-Zero Actually Saves](https://devtoollab.com/blog/best-serverless-postgres): Scale-to-zero beats a flat monthly plan below 32 percent utilization, and the crossover is arithmetic you can check. A developer comparison of Neon and Supabase with verified pricing, plus what happened to Neon's open-source repo after Databricks bought it. (updated 2026-08-15)
- [Local LLM VRAM Requirements: How Much Memory You Actually Need](https://devtoollab.com/blog/local-llm-vram-requirements): A Q4_K_M 8B model is 23 percent bigger than the quant name implies, and at 128k context its KV cache is 3.5x the weights. The memory math for running local LLMs, checked against real GGUF file sizes. (updated 2026-08-15)
- [OmniRoute: A Free AI Gateway for 300+ LLM Providers and 1,200+ Models](https://devtoollab.com/blog/omniroute-free-ai-gateway): OmniRoute reached 48,000 GitHub stars in six months by putting 300+ LLM providers behind one local endpoint with automatic fallback. Here is what it actually does, how the free-tier math works, and the terms-of-service table you should read before pointing it at anything. (updated 2026-08-15)
- [Best AI Code Execution Sandboxes in 2026: E2B, Modal, Daytona and Cloudflare Compared](https://devtoollab.com/blog/best-ai-code-execution-sandboxes): Agent-generated code reaches your SSH keys in 78 milliseconds, so a timeout is not a sandbox. A developer comparison of E2B, Modal, Daytona, Cloudflare and Vercel with verified prices, plus the one everyone still calls open source that went private in June 2026. (updated 2026-08-14)
- [Best AI Browser Automation Tools in 2026: Browserbase, Stagehand, browser-use and Skyvern Compared](https://devtoollab.com/blog/best-ai-browser-automation-tools): The WebVoyager scores every roundup quotes are not comparable, one of the leading frameworks is AGPL, and prompt injection here is structural. A developer comparison of browser agent tools with verified licenses, real pricing, and a fetch-versus-browser test run locally. (updated 2026-08-12)
- [Best LLM Guardrails Tools in 2026: What to Use Now That LLM Guard Is Archived](https://devtoollab.com/blog/best-llm-guardrails-tools): The most-recommended open-source LLM guardrail library was archived in July 2026, and most roundups have not noticed. A developer comparison of the five open-source options that are still maintained plus the managed alternatives, with verified licenses, real pricing, and a PII redaction test run locally. (updated 2026-08-11)
- [Best Synthetic Data Generation Tools in 2026: Faker, SDV, MOSTLY AI and NVIDIA NeMo Compared](https://devtoollab.com/blog/best-synthetic-data-generation-tools): NVIDIA bought Gretel, SDV quietly left MIT for the Business Source License, and MOSTLY AI open-sourced its SDK. A developer comparison of synthetic data tools with verified licenses, real prices, and a correlation test run locally. (updated 2026-08-10)
- [Best Embedding Models and APIs in 2026: OpenAI, Voyage, Cohere and Open Weights Compared](https://devtoollab.com/blog/best-embedding-models-apis): OpenAI, Voyage, Cohere and Gemini all repriced or relaunched their embedding lineups this year, and open-weight models like Qwen3-Embedding and Google's on-device EmbeddingGemma closed the quality gap. A developer comparison with verified pricing and a real embedding computed locally. (updated 2026-08-09)
- [Best Secrets Management Tools in 2026: Vault, OpenBao, Infisical and the Cloud Options Compared](https://devtoollab.com/blog/best-secrets-management-tools): HashiCorp retired the cheap way to buy Vault as a service and jumped straight to version 2.0 under IBM. A developer comparison of Vault, OpenBao, Infisical, Doppler, the cloud secret managers and SOPS, with verified pricing and encryption run locally. (updated 2026-08-08)
- [Best Infrastructure as Code Tools in 2026: Terraform, OpenTofu, Pulumi and Crossplane Compared](https://devtoollab.com/blog/best-infrastructure-as-code-tools): A developer comparison of the infrastructure as code tools that matter in 2026: Terraform under IBM, OpenTofu 1.12, Pulumi, Crossplane v2, Terragrunt, Atlantis and OpenTaco, with real per-resource prices and state encryption code run locally. (updated 2026-08-08)
- [Best Static Code Analysis Tools in 2026: Open Source Linters and SAST Tested](https://devtoollab.com/blog/best-static-code-analysis-tools): The best static code analysis tools in 2026, tested locally - from Oxlint's type-aware linting and Ruff's Rust-powered speed to Semgrep, Opengrep, Trivy, and SonarQube's quality gates. Open source first, with real versions and output. (updated 2026-08-05)
- [Best AI Fine-Tuning Platforms in 2026: Hosted and Open Source Compared](https://devtoollab.com/blog/best-ai-fine-tuning-platforms): OpenAI is winding down self-serve fine-tuning by January 2027. Here is where to train instead: Azure, Vertex, Bedrock, Together, Fireworks, Tinker, and the open source stack, with real prices and code I ran. (updated 2026-08-04)
- [Best Speech-to-Text and AI Voice APIs in 2026: Hosted and Open Source Compared](https://devtoollab.com/blog/best-speech-to-text-apis): A developer comparison of the best speech-to-text and AI voice APIs in 2026: Speechmatics Melia-1, AssemblyAI Universal-3.5 Pro, Deepgram Nova-3 and Flux, ElevenLabs Scribe v2, OpenAI and Google, plus open-source options like Whisper, Parakeet and Moonshine. Real pricing, verified code, and the billing details nobody puts on the pricing page. (updated 2026-08-02)
- [Best AI Bug Detection Tools for Development Teams in 2026](https://devtoollab.com/blog/best-ai-bug-detection-tools): The best AI bug detection tools in 2026 compared: Sentry Seer, Rollbar, Google DeepMind's CodeMender and Big Sleep, Metabob, and OpenHands. Real pricing, verified code, and the AI agent that stopped a zero-day before it was exploited. (updated 2026-08-01)
- [Best AI QA and Autonomous Testing Tools for Developers in 2026](https://devtoollab.com/blog/best-ai-qa-autonomous-testing-tools): The best AI QA and autonomous testing tools in 2026 compared: QA Wolf, Applitools, mabl, Momentic, Functionize, and the open-source Playwright MCP stack - real pricing, working code, and what Gartner's first Magic Quadrant for this category actually says. (updated 2026-07-31)
- [Best Prompt Management Tools for LLM Apps in 2026](https://devtoollab.com/blog/best-prompt-management-tools): The best prompt management tools in 2026 compared: PromptLayer, Langfuse, Braintrust, PromptHub, MLflow, and Opik. Real pricing, verified code, and the acquisitions that took half the market off the board. (updated 2026-07-30)
- [Best LLM Gateways and API Routers in 2026](https://devtoollab.com/blog/best-llm-gateways): The best LLM gateways and API routers in 2026 compared: OpenRouter, LiteLLM, Portkey, and Cloudflare - real pricing, working code, and the 2026 acquisitions reshaping the market. (updated 2026-07-28)
- [Best AI Agent Frameworks in 2026: Python & TypeScript Compared](https://devtoollab.com/blog/best-ai-agent-frameworks): 57% of teams now run AI agents in production. A developer's honest guide to the best agent frameworks in 2026 - LangGraph, CrewAI, OpenAI Agents SDK, Pydantic AI, Mastra, and more - with the tradeoffs that actually matter. (updated 2026-07-25)
- [Best Vector Databases in 2026: Tested & Ranked](https://devtoollab.com/blog/best-vector-databases): Qdrant raised $50M while Pinecone explored a sale. A developer's honest comparison of the top vector databases in 2026 - Pinecone, Weaviate, Qdrant, Milvus, and pgvector - with pricing, tradeoffs, and how to pick one. (updated 2026-07-24)
- [Claude Code Git Worktrees: Run 5 AI Agents in Parallel (2026 Guide)](https://devtoollab.com/blog/claude-code-git-worktrees-parallel-agents-guide): Claude Code's git worktrees let you run multiple AI coding sessions in parallel without file conflicts. Here's the --worktree flag, .worktreeinclude, and subagent isolation, explained with working commands and this week's fixes. (updated 2026-07-23)
- [A2A Protocol Explained: 150+ Companies Backed It in a Year, Here's What It Actually Solves](https://devtoollab.com/blog/a2a-protocol-guide): A2A crossed 150 supporting organizations and 22,000 GitHub stars in its first year under the Linux Foundation. Here's what the Agent2Agent protocol actually does, how it differs from MCP, and a working Python example for when you genuinely need it. (updated 2026-07-19)
- [LLM Structured Outputs: Get JSON That Always Parses (2026 Guide)](https://devtoollab.com/blog/llm-structured-outputs-guide): Anthropic shipped Structured Outputs in February 2026, so every major LLM can now return JSON that matches your schema. Here's how schema-constrained generation works, the JSON Schema rules that break it, and code you can run today. (updated 2026-07-19)
- [Local-First Apps in 2026: How CRDTs Resolve Conflicts](https://devtoollab.com/blog/local-first-apps-crdt-sync-engine-guide): ElectricSQL rebranded to Electric in 2026 and PowerSync ships to production. Here's how CRDTs actually resolve conflicts in local-first apps, with tested code and real output. (updated 2026-07-13)
- [x402 Protocol Explained: How AI Agents Pay for APIs in Stablecoins (2026 Guide)](https://devtoollab.com/blog/x402-ai-agent-payments-guide): The x402 protocol revives the dormant HTTP 402 status code so AI agents can pay for APIs in stablecoins with no signup and no API key. Here's how it works, real server and client code, and the security tradeoffs nobody mentions. (updated 2026-07-12)
- [Agent Skills Explained: SKILL.md vs MCP and How to Build One in 2026](https://devtoollab.com/blog/agent-skills-open-standard-guide): Agent Skills (SKILL.md) is the open standard now running Claude, Cursor, and 40+ AI tools. Here's the spec, how it differs from MCP, and a tested example. (updated 2026-07-11)
- [Midjourney vs GPT Image 2 vs Nano Banana 2 vs Flux: Best AI Image Generators Ranked for 2026](https://devtoollab.com/blog/best-ai-image-generators): The best AI image generators in 2026, ranked - Midjourney, GPT Image 2, Nano Banana 2, Ideogram 4, Flux.2, Adobe Firefly, Recraft, and Leonardo AI - with real pricing, API examples, and text-rendering benchmarks. (updated 2026-07-07)
- [Post-Quantum Cryptography Migration: A 2026 Developer's Guide](https://devtoollab.com/blog/post-quantum-cryptography-migration-guide): Post-quantum cryptography migration guide: what NIST's ML-KEM and ML-DSA standards mean, what's already in production, and Node.js + OpenSSL code to run today. (updated 2026-07-03)
- [LLM Evals in 2026: A Practical Guide to Testing Your AI App](https://devtoollab.com/blog/llm-evals-guide): LLM apps break silently - a changed prompt, a model update, and your outputs drift without an assertion firing. This guide covers the three eval types, a working Python harness, LLM-as-judge, and CI integration. (updated 2026-07-02)
- [Best LLM Observability Tools 2026: Langfuse, Helicone, and LangSmith Compared](https://devtoollab.com/blog/best-llm-observability-tools): The 5 best LLM observability tools in 2026 compared: Langfuse, Helicone, Braintrust, Phoenix by Arize, and LangSmith - real code, pricing, and honest tradeoffs. (updated 2026-06-29)
- [AI Reasoning Models in 2026: o3 vs Claude vs Gemini Deep Think](https://devtoollab.com/blog/ai-reasoning-models-guide): When to use o3, Claude extended thinking, and Gemini Deep Think in 2026: API setup, benchmarks, latency trade-offs, and a routing decision framework. (updated 2026-06-25)
- [OpenCode 2026: Setup Guide for the Top Open-Source AI Coding Agent](https://devtoollab.com/blog/opencode-guide): OpenCode is the open-source AI coding agent with 170K+ GitHub stars. How to install, configure providers, and use plan vs build mode in 2026. (updated 2026-06-25)
- [AI Agent Memory in 2026: Building Persistent Memory for LLM Apps](https://devtoollab.com/blog/ai-agent-memory-architecture): How to give LLM agents real memory in 2026: in-context buffers, semantic vector stores, and episodic long-term memory with code and framework comparisons. (updated 2026-06-22)
- [Best Countries for Remote Developers in 2026: Full Breakdown](https://devtoollab.com/blog/best-countries-remote-developers): The 8 best countries for remote developers in 2026: ranked by tax rate, visa ease, internet speed, and monthly cost of living with exact income thresholds. (updated 2026-06-22)
- [Vietnam vs India for Software Engineers 2026: Salaries, Talent, and When to Choose](https://devtoollab.com/blog/vietnam-vs-india-software-engineers): Vietnam vs India for software engineers: 2026 salary data, talent pool, time zones, cost of living, and which market to hire from or build your career in. (updated 2026-06-20)
- [GitHub Actions Best Practices 2026: Security, Speed, and Reuse](https://devtoollab.com/blog/github-actions-best-practices): GitHub Actions best practices for 2026: reusable workflows, OIDC auth, SHA pinning, dependency caching, and concurrency controls - with working YAML examples. (updated 2026-06-19)
- [OpenTelemetry Node.js Setup Guide 2026: Traces, Metrics, and Logs](https://devtoollab.com/blog/opentelemetry-nodejs-guide): Add OpenTelemetry to Node.js in 2026: traces, metrics, and logs with working code, Docker Compose dev stack, and a Jaeger vs Grafana Cloud backend comparison. (updated 2026-06-19)
- [Context Engineering in 2026: Developer Guide for LLM Applications](https://devtoollab.com/blog/context-engineering-guide): Context engineering replaced prompt engineering in 2026. Learn RAG strategies, token budget management, cross-session memory, and context compression with Python code examples. (updated 2026-06-18)
- [LangGraph vs CrewAI vs AutoGen 2026: AI Agent Framework Comparison Guide](https://devtoollab.com/blog/langgraph-vs-crewai-vs-autogen): LangGraph, CrewAI, and AutoGen take three different approaches to multi-agent AI. Compare architecture, token cost, and production readiness - with code and a clear decision framework. (updated 2026-06-17)
- [Claude Code Skills Setup Guide: The 12 Best Skills to Install in 2026](https://devtoollab.com/blog/claude-code-skills-setup-guide): Setup guide for the 12 best Claude Code skills in 2026: code-review, security-review, deep-research, graphify, loop, schedule, and more with install steps. (updated 2026-06-15)
- [Best AI Code Documentation Generators in 2026: Ranked and Compared](https://devtoollab.com/blog/best-ai-code-documentation-generators): Mintlify, Swimm, Stenography, GitHub Copilot, JSDoc, Doxygen, and Sphinx ranked by use case, pricing, and language support for 2026. (updated 2026-06-14)
- [Developer Security Toolkit 2026: SAST, SCA & Secrets Scanning](https://devtoollab.com/blog/developer-security-toolkit): 1 in 4 AI code samples has an OWASP flaw. Covers SAST, SCA, and secrets scanning -- the code security layers in 2026 and which tools cut noise. (updated 2026-06-14)
- [Best AI-Powered Code Security Scanning Tools for Developers in 2026](https://devtoollab.com/blog/best-ai-code-security-tools): AI-generated code ships vulnerabilities 40% faster than hand-written code. This guide covers the top AI-powered security scanners -- Snyk, GitHub CodeQL, Aikido, and more -- with real pricing, AutoFix benchmarks, and CI setup examples. (updated 2026-06-11)
- [Email Authentication for Developers: SPF, DKIM, DMARC, BIMI, and MTA-STS in 2026](https://devtoollab.com/blog/email-authentication-developers-guide): Microsoft started rejecting unauthenticated bulk email in May 2025. This is the developer's guide to SPF, DKIM, DMARC, BIMI, and MTA-STS -- with real DNS records, a rollout strategy, and tools to verify everything. (updated 2026-06-10)
- [Beyond Postman: The Best API Testing Tools for Developers in 2026](https://devtoollab.com/blog/best-api-testing-tools): Postman restricted its free plan to one user in March 2026. Here is how Bruno, Insomnia, Hoppscotch, and Thunder Client stack up - and how to pick the right tool for your team. (updated 2026-06-09)
- [uv in 2026: The Python Tool That Replaced pip, Poetry, pyenv, and virtualenv All at Once](https://devtoollab.com/blog/uv-python-package-manager): uv is 10-100x faster than pip and replaces pip, Poetry, pyenv, virtualenv, and pipx with a single Rust-based binary. Here is everything you need to know to switch today. (updated 2026-06-08)
- [Best CLI AI Coding Agents in 2026: Claude Code, Codex, OpenCode, GitHub Copilot CLI & More](https://devtoollab.com/blog/top-cli-ai-coding-agents): The definitive 2026 ranking of CLI AI coding agents. Claude Code, Codex CLI, OpenCode, GitHub Copilot CLI, and Antigravity CLI - covering capabilities, pricing, model support, and which tool fits your workflow. (updated 2026-06-07)
- [AI Code Refactoring in 2026: Tools, Workflows, and What Actually Works](https://devtoollab.com/blog/ai-code-refactoring-tools): The definitive guide to AI code refactoring tools in 2026 - from Cursor and Claude Code to CodeScene ACE and Sourcery. Learn which tools handle multi-file refactors, which specialize in Python, and how to build a workflow that doesn't create more debt than it clears. (updated 2026-06-06)
- [WebAssembly Explained: Complete Wasm & WASI Guide for Developers (2026)](https://devtoollab.com/blog/webassembly-guide): WebAssembly is no longer just a browser technology. In 2026, Wasm runs at the edge, in serverless functions, and inside AI inference pipelines. This complete guide covers everything developers need to know about Wasm, WASI, the Component Model, and how to start building with it today. (updated 2026-06-05)
- [GitHub Copilot vs Cursor vs Windsurf: Best AI Coding Assistants Ranked for 2026](https://devtoollab.com/blog/best-ai-coding-assistants): A hands-on ranking of the best AI coding assistants in 2026- GitHub Copilot, Cursor, Windsurf, Tabnine, Amazon Q, and more. Find out which one actually speeds up your development workflow. (updated 2026-06-04)
- [How to Build an MCP Server in Python: From Zero to Claude-Ready](https://devtoollab.com/blog/build-mcp-server-python): Build your first MCP server in Python in under 30 minutes. This practical guide covers tools, resources, prompts, testing with the MCP Inspector, and connecting your server to Claude Desktop and Claude Code. (updated 2026-06-02)
- [Bun vs Node.js vs Deno 2 in 2026: Benchmarks, Features & When to Use Each](https://devtoollab.com/blog/javascript-runtime-comparison): A practical 2026 comparison of Bun 1.3, Node.js 24, and Deno 2 with real benchmark numbers, TypeScript support details, and a clear recommendation matrix for choosing the right JavaScript runtime. (updated 2026-06-01)
- [What Is Cognitive Debt? How AI Coding Tools Are Silently Eroding Developer Skills (2026)](https://devtoollab.com/blog/cognitive-debt-ai-coding): AI coding tools write your code faster than ever - but research shows they quietly erode the skills needed to understand, debug, and maintain it. Here's what the science says, and what you can do about it. (updated 2026-05-31)
- [TCP vs UDP Explained: Key Differences, Use Cases & When to Use Each (2026)](https://devtoollab.com/blog/tcp-vs-udp): A complete guide to TCP vs UDP - understand how they differ, when to use each, how ping and ICMP work (no ports!), a full well-known ports reference, and a step-by-step port forwarding guide. (updated 2026-05-22)
- [What Is Vibe Coding? Complete Guide, Best Tools & How to Start (2026)](https://devtoollab.com/blog/vibe-coding): Vibe coding is the fastest-growing way to build software in 2026. Learn what it is, how it works, the best tools, and how to ship your first app without writing code from scratch. (updated 2026-05-20)
- [Top 5 Bitly Alternatives in 2026](https://devtoollab.com/blog/top-5-bitly-alternatives): As link management evolves in 2026, Bitly isn't the only player in town. Discover the best Bitly alternatives for branding, analytics, and tracking starting with DevToolLab's powerful URL Tracker. (updated 2026-03-22)
- [Essential Developer Tools Every Programmer Needs in 2026](https://devtoollab.com/blog/essential-developer-tools): Discover the must-have developer tools for 2026 that will boost your productivity, streamline your workflow, and make coding more efficient. From code formatters to API testing tools. (updated 2026-03-12)
- [XML Structure Explained: Developer's Guide 2026](https://devtoollab.com/blog/xml-structure-explained): A practical, developer-focused guide to XML structure. Learn the essential syntax, validation methods, and how to actually parse and process XML in your modern stack. (updated 2026-03-03)

### JSON
- [Complete Guide to JSON Formatting: Best Practices and Tools](https://devtoollab.com/blog/complete-guide-json-formatting): Master JSON formatting with this comprehensive guide covering validation, beautification, minification, and best practices for developers. (updated 2026-03-15)

### Security
- [Modern Password Security: An Engineering Guide for 2026](https://devtoollab.com/blog/password-security-best-practices): Beyond 'use a special character'. A technical dive into password entropy, hashing, NIST guidelines, and the tools every developer should use to secure authentication. (updated 2026-09-17)
- [Only 8.5% of MCP Servers Use OAuth: A Practical Security Guide for 2026](https://devtoollab.com/blog/mcp-server-authentication-oauth-guide): An October 2025 audit of 5,205 MCP servers found only 8.5% use OAuth. Here's what the spec actually requires, why real breaches trace back to this gap, and how to add OAuth 2.1 with working code. (updated 2026-07-13)
- [Non-Human Identity Security: Your API Keys Outnumber Your Employees 80 to 1](https://devtoollab.com/blog/non-human-identity-security-guide): OWASP just shipped its first Non-Human Identity Top 10. Your API keys, service accounts, and AI agents outnumber your employees 80 to 1, and almost none of them have an owner. Here's the fix, with real code. (updated 2026-07-04)
- [Passkeys Explained: The Developer's Complete Guide to Passwordless Authentication in 2026](https://devtoollab.com/blog/passkeys-passwordless-auth-guide): 5 billion passkeys are now in active use. Google reports a 99.9% lower account compromise rate compared to passwords. Here is the complete technical breakdown of how passkeys work and how to implement them - from WebAuthn registration to production deployment. (updated 2026-06-03)
- [JWT Tokens: Complete Security Guide for Developers](https://devtoollab.com/blog/jwt-tokens-security-guide): Master JWT token security with best practices, common vulnerabilities, and implementation guidelines for secure authentication. (updated 2026-03-03)

### Tutorial
- [Discord File Size Limit: Fit Under 20 MB](https://devtoollab.com/blog/discord-file-size-limit): Discord's free upload limit is 20 MB per file since August 2026. The bitrate math and two-pass ffmpeg command that fit a 45-second 1080p clip under it. (updated 2026-10-25)
- [How to Migrate requirements.txt to uv](https://devtoollab.com/blog/migrate-requirements-txt-to-uv): Run uv init --bare, then uv add -r requirements.txt. Then fix what it drops: the PyTorch index (4.08 GB of CUDA wheels on Linux) and dev-file duplicates. (updated 2026-10-24)
- [PHP2Shell: How to Check and Patch PHP](https://devtoollab.com/blog/php2shell-check-and-patch): PHP2Shell (CVE-2026-109618, CVE-2026-109619) is fixed in PHP 8.5.12, 8.4.27, 8.3.36 and 8.2.35. Check the PHP that runs, patch, restart and mitigate. (updated 2026-10-22)
- [jq select: Filter JSON Arrays by Value](https://devtoollab.com/blog/jq-select-filter-json): Filter JSON with jq select(): match a field, combine and, or and IN, match substrings, export CSV, and fix the errors jq 1.7.1 and 1.8.2 print. (updated 2026-10-21)
- [Are Claude Code Mods Safe? We Checked 22](https://devtoollab.com/blog/claude-code-mods): Claude Code mods run unsandboxed with your permissions. claude plugin validate shows what one can do; 9 of 22 public mods reach files, programs or the network. (updated 2026-10-20)
- [npm Supply Chain Attack Mitigation in 2026](https://devtoollab.com/blog/npm-supply-chain-attack-mitigation): Block dependency install scripts and add a one-day release-age gate. npm 12, npm 11, pnpm, Yarn and Bun settings, tested against the tensorlake worm. (updated 2026-10-19)
- [How to Identify a Device by MAC Address](https://devtoollab.com/blog/identify-device-by-mac-address): The first 3 bytes of a MAC address name the chip maker in the IEEE registry. How to look one up, spot randomized phone addresses, and script it in Python or JS. (updated 2026-10-13)
- [How to Read and Open a Parquet File](https://devtoollab.com/blog/how-to-read-parquet-file): Read a Parquet file with pandas, pyarrow, Polars, DuckDB or Spark, or open one without code. Real commands, real output, and the errors you will hit. (updated 2026-10-11)
- [How to Resolve Git Merge Conflicts](https://devtoollab.com/blog/resolve-git-merge-conflicts): Edit the block between the conflict markers, then git add and commit. Command line, VS Code and GitHub, plus why a rebase swaps ours and theirs. (updated 2026-10-10)
- [How to Enable CORS in Express and Next.js](https://devtoollab.com/blog/how-to-enable-cors): CORS is enabled on the server, not the browser. Working Express, FastAPI and Next.js configs, how preflight works, and the six errors Chrome prints, with fixes. (updated 2026-10-09)
- [How to Spot AI Crawlers in Server Logs](https://devtoollab.com/blog/how-to-find-ai-crawlers-in-logs): Search your access log for GPTBot, ClaudeBot and PerplexityBot, then check each IP against the vendors' published ranges. Includes a Python script and output. (updated 2026-10-09)
- [How to Verify HubSpot Webhook Signatures](https://devtoollab.com/blog/how-to-verify-hubspot-webhook-signature): HubSpot signs webhooks with HMAC SHA-256 over method, URL, body and timestamp. A tested Node.js verifier, a Python cross-check and the pitfalls behind 401s. (updated 2026-10-09)
- [How to Check SSL Certificate Expiration](https://devtoollab.com/blog/how-to-check-ssl-certificate): Pipe openssl s_client into openssl x509 -enddate to see when a server's SSL certificate expires. Plus -checkend for cron, curl, Python, Node and PFX files. (updated 2026-10-05)
- [How to Open Large CSV Files (1M+ Rows)](https://devtoollab.com/blog/how-to-open-large-csv-file): Excel stops at 1,048,576 rows. Open a bigger CSV with DuckDB, pandas chunks, Polars or a browser viewer, or split it into Excel-sized files. (updated 2026-10-03)
- [How to Generate an SSH Key for GitHub](https://devtoollab.com/blog/how-to-generate-ssh-key): Run ssh-keygen -t ed25519, load the key into ssh-agent, paste the .pub file into GitHub, then test with ssh -T. Commands for Mac, Windows and Linux. (updated 2026-10-01)
- [How to Track AI Referral Traffic in GA4](https://devtoollab.com/blog/how-to-track-ai-traffic-ga4): GA4 now puts ChatGPT, Claude and Perplexity visits in an AI Assistant channel, but it missed 5.5% of our AI sessions. The custom channel and regex that fix it. (updated 2026-10-01)
- [OpenAI Rate Limits in Python: Fix 429s](https://devtoollab.com/blog/openai-rate-limits-python): Handle OpenAI 429 rate limit errors in Python with the SDK's built-in retries, exponential backoff with jitter and a fallback to a second provider. (updated 2026-09-30)
- [How to Validate a Credit Card Number](https://devtoollab.com/blog/how-to-validate-credit-card-number): Strip spaces, check for 12 to 19 digits, run the Luhn checksum, then match the prefix to a brand. Working code in JavaScript, Python and Java, plus the errors. (updated 2026-09-29)
- [How to Use curl: 12 Commands for APIs](https://devtoollab.com/blog/how-to-use-curl): curl commands for GET, POST, PUT and DELETE, JSON and form data, bearer tokens, redirects and timing, plus fixes for the errors curl actually throws. (updated 2026-09-27)
- [Local AI Git Commit Message Generator](https://devtoollab.com/blog/local-llm-git-commit-messages): Build a Python CLI and a prepare-commit-msg hook that turn a staged diff into a Conventional Commits message using a model on your own machine. (updated 2026-09-21)
- [AI-Powered Webhook Handlers: Smart Event Processing for Developers in 2026](https://devtoollab.com/blog/ai-powered-webhook-handlers): Learn how to build AI-powered webhook handlers that classify events, extract structured data, auto-generate responses, and detect anomalies - with real code examples in Node.js and Python. (updated 2026-07-01)
- [Encoding Text to Morse Code: A Guide to Optical Signals](https://devtoollab.com/blog/text-to-morse-code-optical-signals): Learn how digital text data is serialized into Morse code patterns and explore techniques for translating text inputs into visual flashlight signals. (updated 2026-06-07)
- [What Is JSONata? Learn How to Query JSON Like a Pro](https://devtoollab.com/blog/jsonata-intro): Stop writing endless map/filter chains. Discover JSONata, a lightweight query language that makes complex JSON transformations elegant and simple. (updated 2026-03-10)
- [JSON to XML Conversion: Complete Developer Guide 2026](https://devtoollab.com/blog/json-to-xml-conversion-guide): Learn how to convert JSON to XML effectively without tearing your hair out. A practical guide to handling arrays, lost data types, and legacy SOAP APIs. (updated 2026-03-05)

## Tools (870, by category)

### AI Tools
- [AI Token Counter](https://devtoollab.com/tools/ai-token-counter): Estimate token count for GPT-5, Claude 3, Gemini, and Llama models. Paste any text to see token usage and estimated API cost instantly.
- [Text Chunker](https://devtoollab.com/tools/text-chunker): Text chunker splits long documents into overlapping chunks for embeddings and RAG, with recursive paragraph and sentence boundaries. Free, browser-based, no signup.

### Analyzers
- [Accept-Language Parser](https://devtoollab.com/tools/accept-language-parser): Accept-Language parser that ranks browser locales by q-value. Parse the header, spot duplicates and match it against your supported locales. Free.
- [Agent Readiness Scanner](https://devtoollab.com/tools/agent-readiness-scanner): Wondering is your website AI ready? Scan robots.txt, markdown negotiation, bot rules, and MCP/agent protocol signals in seconds. Free instant report, no signup.
- [Anagram Solver & Generator Online](https://devtoollab.com/tools/anagram-solver): Find all anagrams of any word and check if two words or phrases are anagrams of each other. Instant results using a built-in word list. Free online anagram tool.
- [APK Analyzer Online](https://devtoollab.com/tools/apk-analyzer): APK analyzer that reads an Android app's manifest, permissions, exported components and signing certificate in your browser. Opens AAB and XAPK too. Free.
- [Aspect Ratio Checker](https://devtoollab.com/tools/aspect-ratio-checker): Upload an image or video to instantly detect its exact pixel dimensions, aspect ratio, and the closest standard ratio like 16:9 or 4:3. Free and private.
- [CSP Analyzer](https://devtoollab.com/tools/csp-analyzer): Analyze a Content-Security-Policy header for unsafe directives like unsafe-inline, unsafe-eval, and wildcard sources. Get instant security warnings. Free, client-side, no signup.
- [CSV Diff Checker](https://devtoollab.com/tools/csv-diff-checker): CSV diff checker compares two CSV files row by row and shows added, removed, and modified cells with key column matching. Free, private, all in your browser.
- [CSV Row Counter](https://devtoollab.com/tools/csv-row-counter): CSV row counter that streams files of any size in your browser. Counts quoted rows correctly and checks the Excel 1,048,576-row limit. Free, never uploaded.
- [Cyclomatic Complexity Calculator](https://devtoollab.com/tools/cyclomatic-complexity-calculator): Cyclomatic complexity calculator scores every JavaScript and TypeScript function's decision-point complexity in your browser. Spot risky code before review. Free, no signup.
- [EXPLAIN Plan Visualizer](https://devtoollab.com/tools/explain-plan-visualizer): Postgres EXPLAIN ANALYZE visualizer shows a color-coded plan tree with per-node self time, row estimate misses, disk spills, and slow sequential scans. Free, no signup.
- [GitHub Repo Stats Online](https://devtoollab.com/tools/github-repo-stats): Fetch GitHub repository metrics like stars, forks, open issues, and size using the public GitHub API. Quickly audit any repo without leaving your browser.
- [GitHub User Stats Online](https://devtoollab.com/tools/github-user-stats): Fetch public GitHub profile metrics including followers, repos, and gists via the GitHub API - instant results, no login required.
- [Grok Pattern Tester](https://devtoollab.com/tools/grok-pattern-tester): Grok pattern tester for Logstash and Elasticsearch. Match log lines against %{SYNTAX:SEMANTIC} patterns and preview every extracted field. Free, in-browser.
- [HAR File Analyzer](https://devtoollab.com/tools/har-file-analyzer): HAR file analyzer parses Chrome and Firefox DevTools exports into a readable performance report with request timing, sizes, and failures. Free, browser-based, no upload.
- [Hash Identifier](https://devtoollab.com/tools/hash-identifier): Hash identifier that works out which algorithm produced an unknown hash. Detects MD5, SHA-256, bcrypt, Argon2, NTLM, MySQL and 40 more formats in your browser.
- [HL7 Parser](https://devtoollab.com/tools/hl7-parser): HL7 parser and viewer for v2 messages. Splits ADT, ORU and ORM messages into named segments, fields and components, flags MSH errors, and keeps PHI local.
- [HTTP Cache Header Analyzer](https://devtoollab.com/tools/http-cache-header-analyzer): Paste HTTP response headers to see effective cache lifetime, whether shared or private caches can store the response, and any conflicting directives. Free.
- [IAM Policy Analyzer](https://devtoollab.com/tools/iam-policy-analyzer): Analyze an AWS IAM policy for wildcard actions, open resources and missing conditions. Flags least-privilege risks before a SOC 2 review. Free.
- [JSON Diff & Compare Tool](https://devtoollab.com/tools/json-diff): Compare two JSON objects and find all differences. Detect added, removed, and changed properties with full path details and color-coded results.
- [JSON Path Finder & Tester](https://devtoollab.com/tools/json-path-finder): Find, test, and extract data from JSON using JSONPath expressions. Click any value to get its path, or query with JSONPath syntax.
- [LCOV Viewer](https://devtoollab.com/tools/lcov-viewer): LCOV viewer that reads an lcov.info file and shows line, function and branch coverage per file, worst files first, with uncovered line ranges. Free.
- [List Comparer](https://devtoollab.com/tools/list-comparer): List comparer finds items in both lists, items unique to each, the union, and duplicates inside each list. Free, browser-based, handles millions of rows.
- [MIME Type Checker](https://devtoollab.com/tools/mime-type-checker): Check common MIME types using file signatures, browser-reported content types, and extension lookup. Useful for upload validation and content-type debugging.
- [Multipart Form Data Parser](https://devtoollab.com/tools/multipart-form-data-parser): Multipart form data parser for raw HTTP request bodies. Split any multipart/form-data payload into named parts with filenames, types and sizes.
- [Nginx Log Analyzer](https://devtoollab.com/tools/nginx-log-analyzer): Analyze nginx and Apache access logs online. See top IPs, endpoints, status codes, and user agents with visual charts. Paste log lines directly - no upload or server access needed.
- [NPM Download Stats Online](https://devtoollab.com/tools/npm-download-stats): Check daily, weekly, or monthly NPM download counts for any package using the official registry API. Compare trends and gauge library adoption instantly.
- [NPM Package Info Online](https://devtoollab.com/tools/npm-package-info): Look up npm package metadata, versions, dependencies, and maintainers instantly using the official NPM registry API - no login needed.
- [NPM Package Size Checker Online](https://devtoollab.com/tools/npm-package-size-checker): Estimate minified and gzip bundle sizes for NPM packages before adding them to your project. Avoid bloated dependencies with instant size analysis.
- [OpenAPI Diff Checker](https://devtoollab.com/tools/openapi-diff-checker): OpenAPI diff checker compares two Swagger or OpenAPI specs and flags breaking changes: removed paths, methods, and newly required parameters. Free, browser-based.
- [Palindrome Checker Online](https://devtoollab.com/tools/palindrome-checker): Check if a word or phrase is a palindrome. Supports ignoring spaces, punctuation, and letter case for flexible detection.
- [Prometheus Metrics Parser](https://devtoollab.com/tools/prometheus-metrics-parser): Prometheus metrics parser that turns exposition format into structured JSON. Reads HELP, TYPE, labels, histograms and OpenMetrics. Free, in-browser.
- [PyPI Package Inspector Online](https://devtoollab.com/tools/pypi-package-inspector): Inspect Python package metadata, release version, classifiers, and compatibility details directly from the PyPI JSON API. Useful for auditing Python dependencies.
- [Regex Explainer](https://devtoollab.com/tools/regex-explainer): Explain any regex pattern in plain English instantly. Breaks down groups, quantifiers, character classes, and anchors token by token. Free, client-side, no signup.
- [Secret Scanner](https://devtoollab.com/tools/secret-scanner): Secret scanner that finds leaked API keys, tokens and private keys in pasted code. 28 rules for AWS, GitHub, Stripe, OpenAI and more. Nothing is uploaded.
- [Semantic HTML Checker](https://devtoollab.com/tools/semantic-html-checker): Check semantic HTML structure for missing landmarks, skipped heading levels and div soup. Paste markup and get a scored, line-referenced report. Free.
- [Source Map Decoder](https://devtoollab.com/tools/source-map-decoder): Decode a JavaScript or CSS source map to trace minified line and column numbers back to the original file, line, and symbol name. Free, instant VLQ decoding, fully client-side.
- [SQL Query Explainer](https://devtoollab.com/tools/sql-query-explainer): Explain any SQL query in plain English instantly. Breaks down SELECT, JOIN, WHERE, GROUP BY, and more clause by clause. Free, client-side, no signup.
- [Stack Trace Parser](https://devtoollab.com/tools/stack-trace-parser): Stack trace parser turns raw JavaScript, Python, Java and Go traces into a clean frame table that separates your app code from vendor noise.
- [Syslog Parser](https://devtoollab.com/tools/syslog-parser): Syslog parser that decodes RFC 5424 and RFC 3164 lines into facility, severity, timestamp, hostname, app name and structured data. Free, in-browser.
- [Text Readability Checker](https://devtoollab.com/tools/readability-checker): Analyze the readability of any text using Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, and ARI formulas. Find your text's grade level instantly.
- [Text Size Calculator](https://devtoollab.com/tools/text-size-calculator): Calculate the size of input text as UTF-8, UTF-16, UTF-32, JSON string, Base64, and URL-encoded data. Useful for code, DB documents, and API payloads.
- [Unicode Character Inspector](https://devtoollab.com/tools/unicode-inspector): Inspect every Unicode character in your text: code points, hex values, UTF-8 bytes, and types. Find invisible characters and debug encoding issues free online, no signup.
- [URL Parser](https://devtoollab.com/tools/url-parser): URL parser - extract protocol, host, path, query parameters, and hash fragments. Free, no signup, works instantly online.
- [User Agent Parser](https://devtoollab.com/tools/user-agent-parser): Parse and analyze user agent strings to detect browser, operating system, device type, and bot information. Essential for web debugging.
- [Webpack Bundle Stats Analyzer](https://devtoollab.com/tools/bundle-stats-analyzer): Webpack bundle stats analyzer reads stats.json to rank your largest packages, modules and chunks, and flags duplicate versions. Free, runs in your browser.
- [Website Carbon Calculator](https://devtoollab.com/tools/website-carbon-calculator): Check how eco-friendly any website is. Measure CO₂ emissions per page view, page weight, green hosting status, and carbon rating (A+ to F) using the Website Carbon API.
- [Word & Character Counter Online](https://devtoollab.com/tools/word-counter): Count words, characters, sentences, paragraphs and lines in your text. Analyze letter density and reading time instantly.
- [Word Frequency Counter Online](https://devtoollab.com/tools/word-frequency-counter): Count how often each word appears in your text. Analyze keyword density, find overused words, and export results as CSV.
- [YAML Diff Checker](https://devtoollab.com/tools/yaml-diff-checker): YAML diff checker compares two YAML files and shows every added, removed, and changed key with structural diffing that ignores order and formatting. Free, private tool.

### Calculators
- [Age Calculator](https://devtoollab.com/tools/age-calculator): Calculate your exact age in years, months, days, hours, and minutes. Find your zodiac sign, day of birth, and countdown to next birthday.
- [Alcohol / Beer Delivery Tip Calculator](https://devtoollab.com/tools/alcohol-beer-delivery-tip-calculator): Calculate the right tip for alcohol and beer delivery orders. Factor in heavy cases, delivery distance, minimum tip, and bill splitting for Drizly, Instacart, and liquor delivery. Free, instant, no signup.
- [APR Calculator](https://devtoollab.com/tools/apr-calculator): Calculate a loan's true APR by folding origination fees and points into the nominal interest rate. Includes finance charge and amortization schedule. Free.
- [Aspect Ratio Calculator](https://devtoollab.com/tools/aspect-ratio-calculator): Calculate aspect ratios, scale dimensions proportionally, and find dimensions from any ratio. Perfect for video, image, and screen resolution calculations.
- [Autophagy Calculator](https://devtoollab.com/tools/autophagy-calculator): Estimate your personalized autophagy onset based on hours fasted, experience level, age, and exercise. See your current fasting phase, milestone tracker, and tips to accelerate cellular repair.
- [Average Calculator](https://devtoollab.com/tools/average-calculator): Calculate the mean, median, mode, and range of any set of numbers. Paste or type your numbers, get instant statistical results with a clear breakdown and data summary.
- [AWS Lambda Cost Calculator](https://devtoollab.com/tools/aws-lambda-cost-calculator): AWS Lambda cost calculator: estimate monthly requests, GB-second duration, free tier and Provisioned Concurrency, with x86 and Arm compared. Free.
- [AWS Secrets Manager Cost Calculator](https://devtoollab.com/tools/aws-secrets-manager-cost-calculator): AWS Secrets Manager cost calculator: price secrets, replicas and API calls each month, then compare the bill with SSM Parameter Store standard and advanced.
- [BAC Calculator](https://devtoollab.com/tools/bac-calculator): Estimate your blood alcohol content (BAC) using the Widmark equation. Enter weight, gender, drinks consumed, and time elapsed to calculate current BAC level, impairment status, and time to sober up.
- [Base64 Size Calculator](https://devtoollab.com/tools/base64-size-calculator): Calculate the exact Base64-encoded size of any file or string, or work backward from Base64 length to bytes. Includes data URI overhead. Free, no signup.
- [Biological Age Calculator](https://devtoollab.com/tools/biological-age-calculator): Find out your biological age based on 7 key lifestyle factors: BMI, exercise, sleep, smoking, diet, stress, and alcohol. Compare to your chronological age and get a personalised factor breakdown.
- [Birthstone Calculator](https://devtoollab.com/tools/birthstone-calculator): Birthstone calculator shows the modern and traditional birthstone for any birth month, with its color, Mohs hardness and care notes. Free, no signup required.
- [Bitwise Calculator](https://devtoollab.com/tools/bitwise-calculator): Calculate bitwise AND, OR, XOR, NOT, and shift operations on integers. See results in decimal, hex, and binary with 8, 16, or 32-bit width. Free online bit manipulation tool.
- [Blood Type Calculator](https://devtoollab.com/tools/blood-type-calculator): Blood type calculator shows which ABO and Rh blood types a child can inherit from two parents, with probability ranges and the types that are impossible. Free, no signup.
- [Bloom Filter Calculator](https://devtoollab.com/tools/bloom-filter-calculator): Bloom filter calculator for sizing bit arrays: enter item count and target false positive rate to get bits, hash functions and memory. Free.
- [BMI Calculator Online](https://devtoollab.com/tools/bmi-calculator): Calculate your Body Mass Index (BMI) instantly. Get health category, healthy weight range, and personalized insights based on your height and weight.
- [BMR Calculator Online](https://devtoollab.com/tools/bmr-calculator): Estimate your basal metabolic rate and daily maintenance calories using the Mifflin-St Jeor formula. Supports metric and imperial units for accurate TDEE planning.
- [Body Fat Calculator Online](https://devtoollab.com/tools/body-fat-calculator): Estimate body fat percentage using U.S. Navy measurements. Get fat mass, lean mass, and category instantly for fitness tracking.
- [Break Even Calculator](https://devtoollab.com/tools/break-even-calculator): Calculate your break-even point from fixed costs, variable cost per unit, and price. See break-even units, revenue, and margin of safety. Free, browser-based.
- [Burnout Risk Calculator](https://devtoollab.com/tools/burnout-risk-calculator): Assess your workplace burnout risk with 15 questions based on the Maslach Burnout Inventory (MBI-GS). Get a score, six-dimension breakdown, and actionable recovery steps.
- [Business Days Calculator](https://devtoollab.com/tools/business-days-calculator): Calculate business days between dates or add/subtract working days. Supports US Federal holidays, custom holidays, and weekend configurations.
- [Business Loan Calculator Online](https://devtoollab.com/tools/business-loan-calculator): Calculate monthly payments, interest cost, origination fees, and payoff savings for a business loan with optional extra monthly payments.
- [CAGR Calculator Online](https://devtoollab.com/tools/cagr-calculator): Calculate Compound Annual Growth Rate (CAGR) for your investments. Find the annualized return rate between beginning and ending values over a time period.
- [Calorie Calculator Online](https://devtoollab.com/tools/calorie-calculator): Calculate your daily calorie needs based on age, gender, height, weight, and activity level. Get personalized targets for weight loss, maintenance, or muscle gain with macro breakdown.
- [Calories Burned Calculator](https://devtoollab.com/tools/calories-burned-calculator): Calculate calories burned during any exercise using MET values from the Compendium of Physical Activities. Covers 30+ activities including walking, running, cycling, swimming, sports, and daily tasks.
- [Cat Age Calculator](https://devtoollab.com/tools/cat-age-calculator): Cat age calculator converts cat years to human years using the AAHA and AAFP feline guidelines, and reports the matching life stage. Free, runs in your browser.
- [Chronotype Quiz](https://devtoollab.com/tools/chronotype-quiz): Discover your chronotype with a 10-question quiz based on Dr. Breus's sleep science framework. Get your ideal wake time, peak productivity window, best exercise time, and the perfect IF eating window for your biology.
- [Compound Interest Calculator Online](https://devtoollab.com/tools/compound-interest-calculator): Calculate compound interest on savings and investments. See how your money grows over time with monthly or yearly compounding and regular contributions.
- [Cortisol Quiz](https://devtoollab.com/tools/cortisol-quiz): Assess your cortisol load with 15 symptoms across energy, sleep, weight, mood, digestion, and immunity. Get a score, dimension breakdown, and evidence-based recommendations including your optimal IF eating window.
- [Cosine Similarity Calculator](https://devtoollab.com/tools/cosine-similarity-calculator): Calculate cosine similarity, dot product, and Euclidean distance between two vectors instantly. Built for embeddings, RAG pipelines, and ML similarity scoring. Free tool.
- [CPM Calculator Online](https://devtoollab.com/tools/cpm-calculator): Calculate CPM (Cost Per Mille), CPC, CTR, and eCPM for advertising campaigns. Essential tool for marketers, publishers, and advertisers.
- [Cron Next Run Calculator](https://devtoollab.com/tools/cron-next-run-calculator): Cron next run calculator shows the exact times a cron expression fires next, in your local zone, UTC, or any IANA time zone, with DST gotchas flagged. Free, no signup.
- [CSS Specificity Calculator](https://devtoollab.com/tools/css-specificity-calculator): Calculate the specificity of any CSS selector. See the (a,b,c,d) breakdown for IDs, classes, attributes, and elements instantly.
- [CVSS Calculator](https://devtoollab.com/tools/cvss-calculator): CVSS calculator with the official v3.1 base and temporal equations. Score a vulnerability or paste a vector string from NVD to decode it. Shows impact and exploitability subscores.
- [Date Duration Calculator](https://devtoollab.com/tools/date-duration-calculator): Calculate the duration between two dates or add/subtract time periods from a date. Count workdays, weekends, and total days.
- [Days Until Date Calculator Online](https://devtoollab.com/tools/days-until-date): Calculate how many days are left until any future date or how many days have passed since a past date. Includes week and month approximations.
- [Discount Calculator](https://devtoollab.com/tools/discount-calculator): Calculate sale prices, find discount percentages, determine original prices, and compute stacked/double discounts. Essential for shopping and retail.
- [Dividend Yield Calculator](https://devtoollab.com/tools/dividend-yield-calculator): Dividend yield calculator works out annual yield, yield on cost, payout ratio and dividend income from share price and payout. Free, no signup.
- [Dog Age Calculator](https://devtoollab.com/tools/dog-age-calculator): Dog age calculator converts dog years to human years using both the AVMA rule of thumb and the 2020 epigenetic formula, with life stage by breed size. Free, no signup.
- [Download Time Calculator Online](https://devtoollab.com/tools/download-time-calculator): Estimate how long it takes to download a file based on your internet speed. Enter file size (MB/GB/TB) and connection speed (Mbps/Gbps) to get instant download time estimates.
- [DynamoDB Item Size Calculator](https://devtoollab.com/tools/dynamodb-item-size-calculator): DynamoDB item size calculator that sizes plain or DynamoDB JSON by AWS rules, shows RCU and WCU per read and write, and flags the 400 KB limit. Free.
- [Electricity Cost Calculator Online](https://devtoollab.com/tools/electricity-cost-calculator): Calculate how much an appliance costs to run per day, month, and year. Enter wattage, usage hours, and electricity rate to estimate your power bill. Includes common appliance wattages.
- [Exponential Backoff Calculator](https://devtoollab.com/tools/exponential-backoff-calculator): Calculate exponential backoff retry schedules for API calls. Set base delay, multiplier, and max cap to see per-attempt delays with full, equal, or no jitter. Free online tool.
- [Fasting Electrolyte Calculator](https://devtoollab.com/tools/fasting-electrolyte-calculator): Calculate your daily electrolyte targets during intermittent or extended fasting. Personalized for body weight, activity level, keto status, and sweat rate. Includes a morning/midday/evening dosing schedule.
- [Fasting Mimicking Diet Calculator](https://devtoollab.com/tools/fasting-mimicking-diet-calculator): Plans your personalized 5-day Fasting Mimicking Diet cycle based on Dr. Valter Longo's protocol. Calculates calorie and macro targets for each day adjusted for your body weight and goal.
- [FIRE Number Calculator](https://devtoollab.com/tools/fire-number-calculator): Calculate your FIRE number - the investment portfolio size needed to retire early. Uses the 4% safe withdrawal rule. Shows years to FIRE, Coast FIRE number, Lean/Fat FIRE variants, and year-by-year savings projections.
- [Fraction Calculator](https://devtoollab.com/tools/fraction-calculator): Calculate fractions online: add, subtract, multiply, and divide fractions or mixed numbers. Shows step-by-step solution with simplified results and decimal equivalent.
- [Freelance Rate Calculator](https://devtoollab.com/tools/freelance-rate-calculator): Freelance rate calculator turns your target income, expenses, time off and billable hours into the hourly and day rate you need to charge. Free.
- [Fuel Cost Calculator Online](https://devtoollab.com/tools/fuel-cost-calculator): Calculate fuel cost for any trip based on distance, vehicle MPG or L/100km, and gas price. Estimate road trip gas expenses with US and metric unit support.
- [Generation Calculator](https://devtoollab.com/tools/generation-calculator): Generation calculator finds which generation a birth year falls in, from Baby Boomer to Gen Z and Gen Alpha, with the source for every date range. Free, no signup.
- [GKI Calculator](https://devtoollab.com/tools/gki-calculator): Calculate your Glucose Ketone Index (GKI) from blood glucose and ketone readings. See your metabolic zone on the Seyfried scale and get goal-aligned guidance for weight loss, longevity, or therapeutic ketosis.
- [GLP-1 Weight Loss Calculator](https://devtoollab.com/tools/glp1-weight-loss-calculator): Project your weight loss timeline on GLP-1 medications (Ozempic, Wegovy, Mounjaro, Zepbound) using averages from published clinical trials. See projected weight at 12, 24, and 52 weeks.
- [GPA Calculator Online](https://devtoollab.com/tools/gpa-calculator): Calculate your semester and cumulative GPA instantly. Supports 4.0 scale, 10.0 CGPA scale, and percentage systems. Add courses, grades, and credits for accurate results.
- [GST Calculator Online](https://devtoollab.com/tools/gst-calculator): Calculate GST amounts instantly. Add GST to base price or remove GST from inclusive price. Supports all GST rates with CGST and SGST breakdown.
- [Heart Rate Zone Calculator](https://devtoollab.com/tools/heart-rate-zone-calculator): Calculate your 5 heart rate training zones using Fox, Tanaka, or Karvonen methods. Find your fat burning zone, aerobic zone, and max heart rate for optimized cardio workouts.
- [Hours Calculator](https://devtoollab.com/tools/hours-calculator): Calculate the number of hours and minutes between two times. Perfect for payroll, work hours, shift duration, and time tracking. Supports 12-hour and 24-hour formats with optional break deduction.
- [Ideal Weight Calculator](https://devtoollab.com/tools/ideal-weight-calculator): Calculate your ideal body weight using four medical formulas - Hamwi, Devine, Robinson, and Miller. Enter your height and gender to see a recommended healthy weight range.
- [Inflammation Score Calculator](https://devtoollab.com/tools/inflammation-score-calculator): Calculate your dietary inflammation score across 14 food groups using the Dietary Inflammatory Index (DII). See your top pro-inflammatory drivers and get personalised food swap recommendations.
- [Inflation Calculator](https://devtoollab.com/tools/inflation-calculator): Calculate how inflation has changed the purchasing power of money over time. Enter any amount and see its equivalent value in any year from 1960 to today using US CPI data.
- [Insulin Resistance Calculator](https://devtoollab.com/tools/insulin-resistance-calculator): Calculate your HOMA-IR score to assess insulin resistance using fasting blood glucose and insulin values. Includes QUICKI index, five-tier interpretation, and personalised diet and lifestyle recommendations.
- [Intermittent Fasting Calculator](https://devtoollab.com/tools/intermittent-fasting-calculator): Calculate your eating and fasting windows for any intermittent fasting protocol. Supports 16:8, 18:6, 20:4, OMAD, 5:2, and more. See exact eating window times and metabolic stages reached.
- [IOPS Calculator](https://devtoollab.com/tools/iops-calculator): IOPS calculator for RAID 0, 1, 5, 6 and 10: enter drives, IOPS per disk and read/write mix to get functional IOPS, MB/s and disks for a target. Free.
- [JSON Size Calculator](https://devtoollab.com/tools/json-size-calculator): JSON size calculator that shows exact payload bytes minified, pretty, gzipped and base64, finds the heaviest keys and checks SQS, Lambda and DynamoDB limits.
- [Keto Calculator](https://devtoollab.com/tools/keto-calculator): Calculate your personalized ketogenic diet macros - fat, protein, and net carbs - based on your body stats and goals. Uses Mifflin-St Jeor or Katch-McArdle formula with ketosis likelihood indicator.
- [Kubernetes Pod Calculator](https://devtoollab.com/tools/kubernetes-pod-calculator): Kubernetes pod calculator that works out how many pods fit per node from CPU and memory requests, with system reserved overhead. Free, no signup.
- [Latency Percentile Calculator](https://devtoollab.com/tools/latency-percentile-calculator): Latency percentile calculator turns raw response time samples into p50, p95, p99 and p99.9 with mean and standard deviation. Runs in your browser, free, no signup.
- [Lean Body Mass Calculator](https://devtoollab.com/tools/lean-body-mass-calculator): Calculate your lean body mass (LBM) using the Boer, James, and Hume formulas or exact body fat percentage. Shows fat mass, lean mass, body fat category, and recommended protein intake.
- [Life Expectancy Calculator](https://devtoollab.com/tools/life-expectancy-calculator): Estimate your life expectancy using 10 evidence-based longevity factors including exercise, diet, smoking, sleep, stress, and social connection. See milestone reachability and lifestyle adjustments.
- [Lighthouse Score Calculator](https://devtoollab.com/tools/lighthouse-score-calculator): Lighthouse score calculator using the real log-normal curves and weights. Enter LCP, TBT, CLS, FCP and Speed Index to get your performance score and the biggest points left to win.
- [Little's Law Calculator](https://devtoollab.com/tools/littles-law-calculator): Little's Law calculator for concurrency and throughput: enter any two of arrival rate, latency and in-flight requests to size a pool. Free.
- [LLM Token Cost Calculator](https://devtoollab.com/tools/llm-token-cost-calculator): LLM token cost calculator estimates API spend per call, day, month and year across OpenAI and Claude models, with prompt caching and batch discounts. Free, no signup.
- [LLM VRAM Calculator](https://devtoollab.com/tools/llm-vram-calculator): LLM VRAM calculator: check if a local model fits your GPU or Mac, using real GGUF file sizes and KV cache math matched to llama.cpp. Any context length. Free.
- [Loan EMI Calculator Online](https://devtoollab.com/tools/loan-emi-calculator): Calculate Equated Monthly Installments (EMI) for home loans, car loans, personal loans, and education loans. View amortization schedule with principal vs interest breakdown.
- [Macro Calculator](https://devtoollab.com/tools/macro-calculator): Calculate your ideal daily macronutrient targets - protein, carbs, and fat - using the Mifflin-St Jeor equation. Set your goal (cut, bulk, maintain) and diet type to get accurate calorie and macro breakdowns.
- [Margin Calculator Online](https://devtoollab.com/tools/margin-calculator): Calculate profit margin, markup percentage, and selling prices. Find margin from cost and revenue, convert between margin and markup, and plan pricing strategy.
- [Meeting Cost Calculator](https://devtoollab.com/tools/meeting-cost-calculator): Calculate the real cost of meetings based on attendees, duration, and average salary. See per-meeting, weekly, monthly, and annual cost breakdowns instantly.
- [Metabolic Flexibility Score](https://devtoollab.com/tools/metabolic-flexibility-calculator): A 5-dimension quiz that scores your ability to switch between burning glucose and fat. Get your metabolic flexibility score and a personalized IF protocol recommendation.
- [Mortgage Calculator Online](https://devtoollab.com/tools/mortgage-calculator): Calculate monthly mortgage payments, total interest, and view a full amortization schedule. Supports fixed-rate loans with customizable down payment, interest rate, and loan terms.
- [Net Worth Calculator](https://devtoollab.com/tools/net-worth-calculator): Calculate your net worth by listing assets and liabilities. Instant totals, debt-to-asset ratio, and a copyable summary. Runs fully in your browser - your financial data never leaves your device.
- [Numerology Calculator](https://devtoollab.com/tools/numerology-calculator): Numerology calculator finds your Life Path, Expression, Soul Urge and Personality numbers from your birth date and name, showing every reduction step. Free, no signup.
- [Off-Grid Solar System Calculator](https://devtoollab.com/tools/off-grid-solar-calculator): Size your off-grid solar system for an RV, van, cabin, or emergency backup. Add your appliances, set backup days, and get exact panel count, battery bank size, and charge controller amperage.
- [One Rep Max Calculator](https://devtoollab.com/tools/one-rep-max-calculator): Estimate your one rep max (1RM) using four proven formulas: Epley, Brzycki, Lander, and Lombardi. Generates a complete training weight table from 50-100% of your max for structured strength programming.
- [Ovulation Calculator Online](https://devtoollab.com/tools/ovulation-calculator): Calculate estimated ovulation date, fertile window, implantation window, and next period date from your cycle information.
- [PayPal Fee Calculator](https://devtoollab.com/tools/paypal-fee-calculator): PayPal fee calculator works out the seller fee, what lands in your balance and what to charge so you net the full amount. Current US rates. Free.
- [Percentage Calculator](https://devtoollab.com/tools/percentage-calculator): Calculate percentages easily: find X% of Y, what percent X is of Y, percentage change, and increase/decrease by percentage.
- [Performance Budget Calculator](https://devtoollab.com/tools/performance-budget-calculator): Performance budget calculator turns a target LCP and connection speed into a byte budget per asset type. See how much JS, CSS and image weight fits.
- [Period Calculator](https://devtoollab.com/tools/period-calculator): Predict your next period, ovulation day, and fertile window based on your cycle length. Track upcoming periods for 6 months and understand your cycle phases with this free menstrual cycle calculator.
- [Pregnancy Due Date Calculator Online](https://devtoollab.com/tools/pregnancy-due-date-calculator): Calculate your estimated due date based on your last menstrual period, conception date, IVF transfer, or ultrasound. Track pregnancy progress with trimester timeline and milestones.
- [Prompt Caching Calculator](https://devtoollab.com/tools/prompt-caching-calculator): Prompt caching calculator for Claude and OpenAI APIs. Compare cache write, cache read and uncached input costs, and find your break-even hit rate. Free.
- [Protein Calculator](https://devtoollab.com/tools/protein-calculator): Calculate your optimal daily protein intake based on weight, fitness goal, activity level, and age. Covers goals from RDA minimum to muscle building and athletic performance, with per-meal breakdown.
- [RAID Capacity Calculator](https://devtoollab.com/tools/raid-capacity-calculator): RAID capacity calculator for RAID 0, 1, 5, 6 and 10: enter disk count and size to get usable space, fault tolerance and write penalty. Free.
- [Ratio Calculator Online](https://devtoollab.com/tools/ratio-calculator): Calculate, simplify, and convert ratios to decimal and percentage values. Generate equivalent ratios instantly for scaling and proportion problems.
- [Readability Score Calculator Online](https://devtoollab.com/tools/readability-score-calculator): Calculate Flesch Reading Ease and Flesch-Kincaid Grade Level instantly to improve clarity in blogs, docs, and landing page copy.
- [Reading Time Calculator](https://devtoollab.com/tools/reading-time-calculator): Calculate how long it takes to read any text at different reading speeds. Paste text or enter word count to get reading and speaking time estimates.
- [Retirement Calculator](https://devtoollab.com/tools/retirement-calculator): Plan your retirement with this free calculator. Enter your age, savings, monthly contributions, and expected return to see your projected nest egg and monthly income at retirement.
- [Reverse Diet Calculator](https://devtoollab.com/tools/reverse-diet-calculator): Calculates a week-by-week calorie increase schedule to safely restore your metabolism after dieting or fasting, preventing fat regain while returning to maintenance calories.
- [ROI Calculator Online](https://devtoollab.com/tools/roi-calculator): Calculate Return on Investment (ROI) instantly. Enter your investment cost and final return to see profit percentage, net gain, and annualized ROI for any investment period.
- [Running Pace Calculator](https://devtoollab.com/tools/running-pace-calculator): Calculate running pace, finish time, or distance for any race. Supports 5K, 10K, half marathon, marathon and custom distances. Includes split tables and equivalent race time predictions.
- [S3 Cost Calculator](https://devtoollab.com/tools/aws-s3-cost-calculator): S3 cost calculator for AWS storage, requests, retrieval and data transfer, with every storage class from Standard to Glacier Deep Archive compared. Free.
- [Salary Calculator Online](https://devtoollab.com/tools/salary-calculator): Convert between hourly, daily, weekly, biweekly, monthly, and annual salary. Calculate take-home pay with tax estimates, compare pay rates, and plan your finances.
- [Salary to Hourly Calculator Online](https://devtoollab.com/tools/salary-to-hourly-calculator): Convert annual salary to hourly rate or hourly wage to yearly salary. See full pay breakdown by hour, day, week, bi-weekly, monthly, and annually with customizable work hours.
- [Sales Tax Calculator Online](https://devtoollab.com/tools/sales-tax-calculator): Calculate sales tax with separate state and local rates. Add tax to pre-tax prices or remove tax from tax-inclusive totals with a full breakdown.
- [Scientific Calculator Online](https://devtoollab.com/tools/scientific-calculator): Free online scientific calculator with trigonometric, logarithmic, exponential, and statistical functions. Supports degree/radian modes, memory operations, and calculation history.
- [Shannon Entropy Calculator](https://devtoollab.com/tools/shannon-entropy-calculator): Shannon entropy calculator for any string or text, in bits, nats or dits. Shows symbol frequencies, efficiency and which tokens look like secrets. Free.
- [SIP Calculator Online](https://devtoollab.com/tools/sip-calculator): Calculate returns on Systematic Investment Plan (SIP). See how monthly investments grow over time with expected returns, total invested amount, and wealth gained.
- [Sleep Calculator Online](https://devtoollab.com/tools/sleep-calculator): Calculate the best bedtime or wake-up time based on 90-minute sleep cycles. Find out when to sleep or wake up to feel fully rested and avoid grogginess.
- [Solar Battery Storage Calculator](https://devtoollab.com/tools/solar-battery-calculator): Calculate the right battery storage size for your solar system or backup power needs. Compare LiFePO4, lithium-ion, AGM, and gel batteries with accurate amp-hour and cost estimates.
- [Solar Energy Production Estimator](https://devtoollab.com/tools/solar-energy-production-estimator): Estimate how much electricity your solar panels will produce. Enter panel count, wattage, and your US state to get daily, monthly, and annual kWh production with seasonal breakdowns.
- [Solar Panel Calculator](https://devtoollab.com/tools/solar-panel-calculator): Calculate how many solar panels you need based on your monthly electricity usage and location. Uses real peak sun hours data for all 50 US states to give accurate estimates.
- [Solar ROI Calculator](https://devtoollab.com/tools/solar-roi-calculator): Calculate the return on investment and payback period for a residential solar installation. Factor in the 30% federal tax credit, state incentives, and rising electricity rates to see your true 25-year savings.
- [Solar vs Grid Cost Calculator](https://devtoollab.com/tools/solar-vs-grid-calculator): Compare the 25-year cost of solar vs staying on the grid. Factor in the 30% federal tax credit, loan payments, and rising utility rates to find your exact breakeven year and total savings.
- [Standard Deviation Calculator Online](https://devtoollab.com/tools/standard-deviation-calculator): Compute sample and population standard deviation, variance, mean, and range from comma, space, or line-separated numeric values.
- [Stock Profit Calculator Online](https://devtoollab.com/tools/stock-profit-calculator): Calculate stock trading profit or loss including brokerage fees and taxes. Find net gain, return percentage, and break-even price for your trades.
- [TDEE Calculator](https://devtoollab.com/tools/tdee-calculator): Calculate your Total Daily Energy Expenditure (TDEE) and BMR using the Mifflin-St Jeor equation. Get daily calorie targets for weight loss, maintenance, and muscle gain.
- [Text Similarity Calculator](https://devtoollab.com/tools/text-similarity-calculator): Compare two texts for similarity using Levenshtein edit distance. Get a similarity percentage, common substring, and prefix/suffix stats instantly. Free, no signup.
- [Tip Calculator Online](https://devtoollab.com/tools/tip-calculator): Calculate tips and split bills easily. Choose tip percentage, split between multiple people, and get per-person totals instantly.
- [Two's Complement Converter](https://devtoollab.com/tools/twos-complement-converter): Twos complement converter turns signed decimal, hex or binary into 8, 16, 32 or 64-bit two's complement, with the sign bit, exact range checks and overflow warnings.
- [Unit Price Calculator Online](https://devtoollab.com/tools/unit-price-calculator): Compare two products by price per unit and savings percentage to find the best value. Great for grocery shopping, bulk buying, and cost-per-use analysis.
- [Uptime SLA Calculator](https://devtoollab.com/tools/uptime-sla-calculator): Uptime SLA calculator: turn 99%, 99.9% or 99.999% into allowed downtime per day, week, month and year. Reverse-check a real outage against your error budget. Free, no signup.
- [VAT Calculator Online](https://devtoollab.com/tools/vat-calculator): Calculate VAT by adding tax to net prices or removing VAT from gross prices with custom rates. Instantly see tax amount, net, and gross totals for any country.
- [Video Bitrate Calculator](https://devtoollab.com/tools/video-bitrate-calculator): Video bitrate calculator: turn bitrate and length into file size, or find the bitrate that fits a 20 MB Discord limit, with an ffmpeg two-pass command. Free.
- [Visceral Fat Calculator](https://devtoollab.com/tools/visceral-fat-calculator): Estimate your visceral fat area (VFA in cm²) using the Samouda anthropometric model - no blood test required. Get your risk level, waist-to-height ratio, and a personalised fat-loss action plan.
- [Waist to Hip Ratio Calculator](https://devtoollab.com/tools/waist-to-hip-ratio-calculator): Calculate your waist-to-hip ratio (WHR) using WHO standards to assess cardiovascular health risk. Identifies apple vs pear body shape and provides risk categories for men and women.
- [Water Intake Calculator Online](https://devtoollab.com/tools/water-intake-calculator): Calculate how much water you should drink daily based on your body weight, activity level, and climate. Get personalized hydration recommendations in liters, ounces, and glasses.
- [Weight Loss Timeline Calculator](https://devtoollab.com/tools/weight-loss-timeline-calculator): Calculate exactly how long it will take to reach your goal weight. Uses TDEE and your preferred weekly deficit to project a goal date, daily calorie target, and milestone timeline.
- [Z-Score Calculator Online](https://devtoollab.com/tools/z-score-calculator): Calculate z-score, percentile, and tail probability from value, mean, and standard deviation for normal distribution analysis.
- [ZFS RAIDZ Calculator](https://devtoollab.com/tools/zfs-raidz-calculator): ZFS RAIDZ calculator for usable pool space: RAIDZ1, RAIDZ2, RAIDZ3 and mirrors, with padding, metaslab and slop overhead matched to OpenZFS. Free.
- [Zodiac Sign Calculator](https://devtoollab.com/tools/zodiac-sign-calculator): Zodiac sign calculator finds your sun sign from your birth date with its element, modality, ruling planet, compatible signs and Chinese zodiac animal. Free, no signup.

### Cleaners
- [CSV Duplicate Remover](https://devtoollab.com/tools/csv-duplicate-remover): Remove duplicate rows from a CSV by email, ID or any column. Keep the first or last match, ignore case and spaces, and download the removed rows. Free.
- [HAR Sanitizer](https://devtoollab.com/tools/har-sanitizer): HAR sanitizer that strips cookies, auth headers, tokens and passwords from a .har file in your browser, then flags any secrets left. Free, no upload.
- [HTML Cleaner](https://devtoollab.com/tools/html-cleaner): HTML cleaner strips inline styles, classes, empty tags, comments and Word or Google Docs junk from pasted HTML, then pretty prints clean, readable markup. Free, in your browser.
- [Invisible Character Remover](https://devtoollab.com/tools/invisible-character-remover): Invisible character remover strips zero width spaces, BOMs, bidi overrides, and hidden tag characters, and names every codepoint it finds. Free and private.
- [Makefile Comment Remover](https://devtoollab.com/tools/makefile-comment-remover): Remove comments from Makefiles instantly in your browser. Strip full-line and inline hash comments, respect escaped hashes, drop blank lines, and trim trailing whitespace. Free, private, no upload.
- [PII Redactor](https://devtoollab.com/tools/pii-redactor): PII redactor strips emails, IPs, card numbers, API keys, and tokens out of logs and text before you share them. Free, runs locally, nothing is uploaded.
- [Remove Duplicate Lines Online](https://devtoollab.com/tools/remove-duplicate-lines): Remove duplicate lines from text instantly. Sort lines, trim whitespace, and ignore case with this free online deduping tool.
- [Remove Line Breaks Online](https://devtoollab.com/tools/remove-line-breaks): Remove or replace line breaks from text instantly. Convert multiline content into a single line with custom separators and optional whitespace cleanup.
- [Whitespace Remover Online](https://devtoollab.com/tools/whitespace-remover): Remove extra whitespace, leading/trailing spaces, blank lines, and tabs from text. Clean and normalize text formatting instantly.

### Converters
- [.env to JSON Converter Online](https://devtoollab.com/tools/env-to-json): Convert .env environment variable files to JSON format instantly. Parse KEY=VALUE pairs, handle quoted values, auto-detect types like numbers and booleans, and export clean JSON for configuration management.
- [Area Converter](https://devtoollab.com/tools/area-converter): Area converter for metric and imperial units - square feet to meters, acres to hectares, and more. Free, no install needed.
- [AVIF to JPG Converter Online](https://devtoollab.com/tools/avif-to-jpg): Convert AVIF images to JPG online for free. Adjust JPEG quality, flatten transparency onto a solid background, and export browser-friendly image files instantly.
- [Base64 to PDF Converter](https://devtoollab.com/tools/base64-to-pdf): Base64 to PDF converter decodes Base64 strings into a viewable PDF and encodes PDF files back to Base64. Runs entirely in your browser, no upload, no signup.
- [Binary to Decimal Converter Online](https://devtoollab.com/tools/binary-to-decimal-converter): Convert binary numbers (base-2) to decimal numbers (base-10) instantly. Supports large binary numbers, batch conversion, and handles 0b prefix automatically.
- [Binary, Decimal, Hex, Octal Converter](https://devtoollab.com/tools/binary-code-translator): Convert text to Binary, Decimal, Octal, and Hexadecimal formats. A comprehensive tool to translate text into various computer number systems.
- [Braille Translator](https://devtoollab.com/tools/braille-translator): Braille translator converts text to Unicode braille and back using Grade 1 English Braille, with capital and number signs plus a dot-pattern chart. Free, no signup.
- [BSON to JSON Converter](https://devtoollab.com/tools/bson-to-json): BSON to JSON converter for mongodump .bson files and hex or base64 BSON. Writes MongoDB Extended JSON in relaxed or canonical mode, all in your browser.
- [Color Code Converter](https://devtoollab.com/tools/color-code-converter): Convert color codes between HEX, RGB, HSL, HSV, and CMYK formats instantly. Pick colors visually and copy values with one click.
- [Convert Images to JPG](https://devtoollab.com/tools/image-to-jpg): Convert PNG, GIF, WebP, TIFF, SVG, HEIC, and other image formats to JPG. Batch convert multiple images with adjustable quality settings.
- [Convert JPG to PNG WebP GIF](https://devtoollab.com/tools/jpg-to-png): Convert JPG/JPEG images to PNG, WebP, GIF, or BMP formats. Batch convert with adjustable quality settings. Free online converter.
- [CSS Selector to XPath Converter](https://devtoollab.com/tools/css-selector-to-xpath): CSS selector to XPath converter for Selenium, Playwright and Scrapy: converts classes, attributes, combinators and pseudo-classes, and turns simple XPath back into CSS.
- [CSS to React Native](https://devtoollab.com/tools/css-to-react-native): Convert CSS stylesheets to React Native StyleSheet.create() syntax instantly. Handles px to number conversion, margin and padding shorthands, box-shadow, and unsupported property warnings.
- [CSS to SCSS Converter Online](https://devtoollab.com/tools/css-to-scss): Convert flat CSS to nested SCSS syntax instantly. Transform repetitive selectors into clean, maintainable SCSS with proper nesting, &-references for pseudo-classes and modifiers, and preserved media queries.
- [CSS to Tailwind Converter Online](https://devtoollab.com/tools/css-to-tailwind): Convert plain CSS code into Tailwind CSS utility classes instantly. Paste your CSS and get equivalent Tailwind classes with live preview.
- [CSS Unit Converter](https://devtoollab.com/tools/css-unit-converter): CSS unit converter for px, rem, em, vw, vh, and % with custom base font size and viewport settings - runs entirely in browser.
- [CSV Merger Online](https://devtoollab.com/tools/csv-merger): Merge multiple CSV files into one clean output in seconds - perfect for combining exports and preparing unified datasets, no install.
- [CSV Splitter Online](https://devtoollab.com/tools/csv-splitter): Split large CSV files into smaller chunks by row count for uploads, imports, and batch workflows - runs in browser, no data sent.
- [CSV to Excel Converter](https://devtoollab.com/tools/csv-to-excel): CSV to Excel converter builds a real .xlsx workbook from pasted or uploaded CSV, with typed numbers, real dates and a bold header row. Free, no upload and no signup.
- [CSV to HTML Table Converter](https://devtoollab.com/tools/csv-to-html-table): Convert CSV data to a clean HTML table with Bootstrap-compatible classes. Supports bordered, striped, and responsive options. Copy or download instantly.
- [CSV to JSON Converter](https://devtoollab.com/tools/csv-json-converter): Convert CSV to JSON and JSON to CSV with customizable options. Supports custom delimiters, headers, and nested output. Free, browser-based, no signup required.
- [CSV to Markdown Converter](https://devtoollab.com/tools/csv-to-markdown): Convert CSV to Markdown tables instantly with file upload support and custom delimiters. Runs in your browser - no data sent to any server.
- [CSV to SQL Converter](https://devtoollab.com/tools/csv-to-sql): Convert CSV files to SQL INSERT or UPDATE statements. Customize table names, column types, and database dialects including MySQL, PostgreSQL, and SQLite.
- [CSV to TSV Converter](https://devtoollab.com/tools/csv-to-tsv): Convert CSV files to TSV (tab-separated values) or reverse. Handles quoted fields, embedded commas, and special characters correctly. Free, runs in your browser.
- [CSV to UTF-8 Converter](https://devtoollab.com/tools/csv-to-utf8-converter): CSV to UTF-8 converter that detects Windows-1252 and UTF-16 files and re-encodes them as UTF-8, with an optional BOM so Excel shows accents. Free, in-browser.
- [CSV to XML Converter](https://devtoollab.com/tools/csv-to-xml): Transform CSV data into properly structured XML documents. Customize root elements, row tags, and indentation for clean XML output.
- [CSV to YAML Converter](https://devtoollab.com/tools/csv-to-yaml): Convert CSV data to YAML format instantly in your browser. Handles quoted fields, custom delimiters, header rows, and automatic type detection for numbers and booleans. Free, private, no upload required.
- [Currency Converter Online](https://devtoollab.com/tools/currency-converter): Convert currencies instantly with live exchange rates. Supports 150+ global currency pairs including USD, EUR, GBP, JPY, and emerging market currencies.
- [Data Storage Converter](https://devtoollab.com/tools/data-storage-converter): Convert data storage between bits, bytes, KB, MB, GB, TB, PB, and EB. Supports binary (1024) and decimal (1000) standards.
- [Decimal to Binary Converter Online](https://devtoollab.com/tools/decimal-to-binary-converter): Convert decimal numbers (base-10) to binary numbers (base-2) instantly. Supports zero-padding for 4/8/16/32-bit widths, batch conversion, and large numbers.
- [Design Token Exporter](https://devtoollab.com/tools/design-token-exporter): Design token exporter converts W3C design token JSON into CSS variables, SCSS, Tailwind theme config or JS constants in one click. Free, no signup.
- [Docker Compose to Docker Run](https://devtoollab.com/tools/docker-compose-to-docker-run): Convert docker compose YAML to docker run commands, one per service. Recreates the project network, volumes, ports, env, healthchecks and build steps. Free.
- [Docker Compose to Kubernetes Converter](https://devtoollab.com/tools/docker-compose-to-kubernetes): Docker Compose to Kubernetes converter turns docker-compose.yml into Deployment, Service, ConfigMap and PVC manifests you can kubectl apply. Free, runs in your browser.
- [Docker Run to Compose Converter](https://devtoollab.com/tools/docker-run-to-compose-converter): Docker run to compose converter turns any docker run command into a ready docker-compose.yml file, parsing ports, volumes, env vars and flags. Free, no signup.
- [Emoji Translator](https://devtoollab.com/tools/emoji-translator): Emoji translator turns English text into emoji and decodes emoji back into plain words using a 301 entry dictionary. Runs in your browser, free, no signup.
- [Energy Converter](https://devtoollab.com/tools/energy-converter): Energy converter for Joules, calories, kilowatt-hours, BTU, and more. Instant results for physics or nutrition - free, browser-based, no signup.
- [Env to Kubernetes Secret](https://devtoollab.com/tools/env-to-k8s-secret): Convert .env files to Kubernetes Secret YAML manifests with base64-encoded values. Paste your environment variables and get a ready-to-apply Secret spec instantly. Free.
- [Ethereum Unit Converter](https://devtoollab.com/tools/ethereum-unit-converter): Ethereum unit converter turns wei, gwei, finney and ether into every other unit with exact BigInt math, plus a gas fee calculator for gwei to ETH and USD. Free, no signup.
- [Excel to CSV Converter](https://devtoollab.com/tools/excel-to-csv): Excel to CSV converter turns any .xlsx or .xlsm worksheet into clean CSV, with sheet picking, custom delimiters and ISO dates. Free, private and runs in your browser.
- [Excel to JSON Converter](https://devtoollab.com/tools/excel-to-json): Excel to JSON converter turns any .xlsx or .csv worksheet into clean JSON records, with header keys, ISO dates and multi sheet support. Free, private, runs in your browser.
- [File Size Converter](https://devtoollab.com/tools/file-size-converter): File size converter for bytes, KB, MB, GB, TB, and PB. Supports both binary (1024) and decimal (1000) standards - free and runs in your browser.
- [Geohash Converter](https://devtoollab.com/tools/geohash-converter): Geohash converter that encodes latitude and longitude into a geohash and decodes any geohash back to coordinates, a bounding box and neighbors.
- [Glob to Regex Converter](https://devtoollab.com/tools/glob-to-regex-converter): Glob to regex converter that turns wildcard patterns like src/**/*.ts into anchored JavaScript regex. Supports globstar, braces and classes.
- [GraphQL to TypeScript](https://devtoollab.com/tools/graphql-to-typescript): GraphQL to TypeScript converter turns GraphQL SDL types, enums, interfaces, and unions into ready-to-use TS interfaces. Free, instant, browser-based.
- [Gzip Compress & Decompress](https://devtoollab.com/tools/gzip-compressor): Gzip-compress text to Base64 or decompress Base64 gzip data back to text in your browser. Shows the compression ratio and downloads as .gz. Free, private, powered by CompressionStream.
- [HAR to cURL Converter](https://devtoollab.com/tools/har-to-curl): HAR to cURL converter turns a Chrome or Firefox DevTools HAR export into copy-ready curl commands for every captured request. Free, browser-based, private.
- [HEIC to JPG Converter Online](https://devtoollab.com/tools/heic-to-jpg): Convert Apple HEIC and HEIF photos to JPG, PNG, or WebP format directly in your browser. Batch convert iPhone photos with adjustable quality. No upload to any server - 100% private.
- [Hex to Binary Converter Online](https://devtoollab.com/tools/hex-to-binary-converter): Convert hexadecimal numbers (base-16) to binary numbers (base-2) instantly. Each hex digit maps to exactly 4 binary digits. Supports batch conversion and nibble grouping.
- [Hex to Decimal Converter Online](https://devtoollab.com/tools/hex-to-decimal-converter): Convert hexadecimal to decimal and decimal to hex instantly. Supports large numbers, batch conversion, and shows binary & octal formats. Free browser-based tool.
- [Hex to Text Converter](https://devtoollab.com/tools/hex-to-text-converter): Hex to text converter decodes hexadecimal bytes into readable ASCII or UTF-8 text and converts text back to hex with 0x, \x, comma or space formats. Free and instant.
- [Htaccess to Nginx Converter](https://devtoollab.com/tools/htaccess-to-nginx): Htaccess to nginx converter turns Apache rewrite rules, redirects, headers and expires directives into working nginx config, flagging whatever needs a manual review.
- [HTML Table to JSON](https://devtoollab.com/tools/html-table-to-json): HTML table to JSON converter extracts any HTML table into structured JSON or CSV, using header rows as keys. Paste markup and export instantly. Free, no signup.
- [HTML to JSX Converter](https://devtoollab.com/tools/html-to-jsx): Convert HTML to valid JSX and JSX back to HTML. Handles className, style objects, self-closing tags, event handlers, and comments automatically.
- [HTML to Markdown Converter](https://devtoollab.com/tools/html-to-markdown): HTML to Markdown converter - cleanly transforms headings, tables, code blocks, and images. Runs in the browser, no data sent to servers.
- [HTML to PDF Converter Online](https://devtoollab.com/tools/html-to-pdf): Convert HTML code with CSS styling to PDF documents. Generate professional PDFs from HTML with tables, images, and custom layouts. Free browser-based converter.
- [HTML to Text Converter Online](https://devtoollab.com/tools/html-to-text): Convert HTML to clean plain text by stripping all tags. Handles entities, removes scripts and styles, with options to preserve links, line breaks, and image alt text.
- [HTTP Request to cURL Converter](https://devtoollab.com/tools/http-request-to-curl-converter): HTTP request to cURL converter turns a raw request from devtools, a proxy, or an .http file into a runnable curl command with correct shell quoting. Free, in your browser.
- [ICO Converter](https://devtoollab.com/tools/ico-converter): Convert PNG, JPEG, or WebP images to Windows ICO format. Create multi-size icons (16x16 to 256x256) for favicons and applications. Free, browser-based.
- [ICS to CSV Converter](https://devtoollab.com/tools/ics-to-csv-converter): ICS to CSV converter that turns Google Calendar or Outlook .ics files into Excel-ready rows, expanding repeating events across time zones. Free, in-browser.
- [IEEE 754 Converter](https://devtoollab.com/tools/ieee-754-converter): Convert decimal numbers to IEEE 754 binary and hex, or decode raw bits back into a float instantly. Supports 32-bit single and 64-bit double precision formats.
- [Image to ASCII Art Converter Online](https://devtoollab.com/tools/image-to-ascii): Convert any image or photo into ASCII art text. Adjust width, contrast, and character sets. Download or copy the generated ASCII art instantly.
- [Image to Base64 Converter Online](https://devtoollab.com/tools/image-to-base64): Convert images to Base64 strings instantly. Supports JPEG, PNG, GIF, WebP, SVG, and BMP. Copy CSS background or HTML image tag code easily.
- [Image to PDF Converter Online](https://devtoollab.com/tools/image-to-pdf): Convert images to PDF online for free. Combine multiple JPG, PNG, WebP images into a single PDF with custom page size, orientation, and margins. 100% browser-based.
- [Image to Text Converter Online](https://devtoollab.com/tools/image-to-text): Extract text from images using OCR (Optical Character Recognition). Upload screenshots, photos, or scanned documents and get editable text instantly. Supports 18+ languages.
- [INI to JSON Converter](https://devtoollab.com/tools/ini-to-json): Convert INI and CFG config files to JSON format in your browser. Supports sections, key-value pairs, comments, and multi-line values. Free, no signup.
- [ISO 8601 Duration Converter](https://devtoollab.com/tools/iso-8601-duration-converter): ISO 8601 duration converter turns PT1H30M or P3DT4H5M6S into readable time, clock format and total seconds, and converts any number of seconds back into a valid duration.
- [JPG to RAW Converter](https://devtoollab.com/tools/jpg-to-raw): Convert JPG and JPEG images to raw uncompressed pixel data in your browser. Export RGBA, RGB, grayscale, or BGRA byte streams as headerless .raw files. Batch convert multiple JPGs, free and private.
- [JPG to WebP Converter Online](https://devtoollab.com/tools/jpg-to-webp-converter): Convert JPG, PNG, and other images to WebP format for faster web performance. Batch convert with adjustable quality. 100% browser-based, no upload needed.
- [JS Object to JSON Converter](https://devtoollab.com/tools/js-object-to-json): Convert JavaScript objects and literals to valid JSON format with proper quoting, escaping, and formatting. Handles ES6 shorthand, methods, and complex nested objects. Free browser tool.
- [JSON Flattener Online](https://devtoollab.com/tools/json-flattener): Flatten nested JSON objects into dot-notation keys instantly. Great for logs, spreadsheets, API payload inspection, and analytics workflows.
- [JSON Repair Online](https://devtoollab.com/tools/json-repair): Repair malformed JSON with one click by fixing common syntax issues like trailing commas, unquoted keys, and single-quote strings.
- [JSON to .env Converter Online](https://devtoollab.com/tools/json-to-env): Convert JSON config objects to .env environment variable format and vice versa. Handles type coercion and SCREAMING_SNAKE_CASE key conversion.
- [JSON to C# Converter Online](https://devtoollab.com/tools/json-to-csharp): Convert JSON data to C# classes automatically. Generate strongly-typed C# model classes with properties, JsonProperty attributes, and nested class support.
- [JSON to CSV Converter Online](https://devtoollab.com/tools/json-to-csv-converter): Convert JSON data to CSV format instantly. Supports nested objects, custom delimiters, and batch conversion. Download as CSV or TSV file.
- [JSON to Dart Converter Online](https://devtoollab.com/tools/json-to-dart): Convert JSON data to Dart classes for Flutter development. Generate strongly-typed model classes with fromJson and toJson methods automatically.
- [JSON to Excel Converter Online](https://devtoollab.com/tools/json-to-excel): Convert JSON arrays to Excel-compatible CSV or XLS files instantly. Supports nested objects, custom delimiters (comma, tab, pipe, semicolon), and live table preview. No upload required.
- [JSON to Go Struct Converter Online](https://devtoollab.com/tools/json-to-go): Convert JSON data to Go structs automatically. Generate strongly-typed Go struct definitions with proper field tags, nested struct support, and idiomatic Go naming conventions.
- [JSON to GraphQL Schema Generator Online](https://devtoollab.com/tools/json-to-graphql-schema): Convert JSON samples into GraphQL SDL type definitions with inferred scalars, nested object types, list fields, and non-null options.
- [JSON to HTML Table Converter Online](https://devtoollab.com/tools/json-to-html-table): Convert JSON data into formatted HTML tables instantly. Supports nested objects, arrays, and custom styling. Copy or download the generated HTML table code.
- [JSON to Java Class Converter Online](https://devtoollab.com/tools/json-to-java): Convert JSON data to Java class definitions instantly. Generate POJOs with Lombok support, Jackson annotations, getters/setters, and nested class generation.
- [JSON to JS Object Converter](https://devtoollab.com/tools/json-to-js-object): Convert JSON data to JavaScript objects with proper formatting, key quoting options, and ES6 syntax output. Useful for pasting API responses directly into JS or TS files. Free, privacy-first.
- [JSON to JSONL Converter](https://devtoollab.com/tools/json-to-jsonl): Convert JSON arrays to JSONL (JSON Lines) format with one object per line, or parse JSONL back to a JSON array. Free, instant, runs in your browser.
- [JSON to Kotlin Data Class Converter](https://devtoollab.com/tools/json-to-kotlin): Convert JSON to Kotlin data classes instantly. Generate type-safe models with Gson or Moshi annotations, nullable types, and proper camelCase naming for Android and KMP projects.
- [JSON to Markdown Table Converter Online](https://devtoollab.com/tools/json-to-markdown-table): Convert JSON arrays or objects into clean Markdown tables with alignment options, escaped cells, and copy-ready output for docs, GitHub, and README files.
- [JSON to Mongoose Schema](https://devtoollab.com/tools/json-to-mongoose): Convert JSON sample data to Mongoose schema definitions for MongoDB instantly. Infers types, handles nested objects, ObjectIds, and Date fields. Free, browser-based, no signup.
- [JSON to PHP Array Converter](https://devtoollab.com/tools/json-to-php): Convert JSON to PHP array syntax and PHP arrays to JSON. Perfect for PHP developers working with APIs and configuration files.
- [JSON to Prisma Schema](https://devtoollab.com/tools/json-to-prisma): Convert a JSON object to a Prisma schema model definition. Infers field types, detects IDs and timestamps automatically. Free, browser-based, no install needed.
- [JSON to Protobuf Schema](https://devtoollab.com/tools/json-to-protobuf): Convert JSON objects to Protocol Buffers (proto3) schema definitions instantly. Handles nested objects, arrays, and scalar types. Free, browser-based, no signup required.
- [JSON to Pydantic Converter Online](https://devtoollab.com/tools/json-to-pydantic): Convert JSON to Pydantic Python BaseModel classes instantly. Generate type-safe models with proper typing, Optional fields, Field aliases, and Pydantic v1/v2 support for FastAPI and Django projects.
- [JSON to Python Converter Online](https://devtoollab.com/tools/json-to-python): Convert JSON data to Python dictionaries, dataclasses, or TypedDict definitions. Generate type-safe Python code from JSON with automatic camelCase to snake_case conversion.
- [JSON to Python Dataclass](https://devtoollab.com/tools/json-to-python-dataclass): Convert JSON to Python @dataclass with type hints. Infers str, int, float, bool, Optional, List, and nested dataclasses. No Pydantic needed. Free, browser-based.
- [JSON to Rust Struct Converter Online](https://devtoollab.com/tools/json-to-rust): Convert JSON data to Rust struct definitions with serde derive macros. Generate type-safe Rust models with proper snake_case naming, Option types for nulls, and serde rename attributes.
- [JSON to SQL Converter](https://devtoollab.com/tools/json-to-sql): Convert JSON data to SQL INSERT and CREATE TABLE statements instantly - no install, no signup, free to use in your browser.
- [JSON to Swift Converter Online](https://devtoollab.com/tools/json-to-swift): Convert JSON data to Swift structs with Codable conformance. Generate type-safe Swift models from any JSON API response instantly.
- [JSON to Text Converter](https://devtoollab.com/tools/json-to-text-converter): JSON to text converter that turns nested JSON into an indented outline, dotted key paths or a plain list of values. Skips nulls, copies fast, free.
- [JSON to TOML Converter Online](https://devtoollab.com/tools/json-to-toml): Convert JSON data to TOML format instantly. Supports nested objects, arrays, table arrays, and all TOML data types. Perfect for Rust Cargo, Python pyproject.toml, and Hugo configs.
- [JSON to TOON Converter](https://devtoollab.com/tools/json-to-toon): Convert JSON to TOON to cut LLM prompt tokens. Tabular rows, keyed tables, nested field groups and tab or pipe delimiters, matching the official encoder.
- [JSON to TypeScript Converter](https://devtoollab.com/tools/json-to-typescript): Convert JSON data to TypeScript interfaces and types automatically. Generate strongly-typed interfaces from your JSON API responses.
- [JSON to XML Converter](https://devtoollab.com/tools/json-to-xml): Convert JSON data to XML format instantly in your browser. Supports nested objects, arrays, custom root element names, and pretty-printed output. Free, no signup required.
- [JSON to YAML Converter](https://devtoollab.com/tools/json-to-yaml): Convert JSON data to YAML format with customizable indentation, flow style, and quoting options. Free online tool with privacy-first design.
- [JSON to Zod Schema Generator Online](https://devtoollab.com/tools/json-to-zod): Convert JSON samples into TypeScript-ready Zod schemas for runtime validation, API parsing, forms, and full-stack TypeScript projects.
- [JSON Unflattener Online](https://devtoollab.com/tools/json-unflattener): Convert flattened dot-notation JSON keys back into nested JSON structure. Rebuild complex objects from flat API or CSV-style key maps.
- [JSX to HTML Converter](https://devtoollab.com/tools/jsx-to-html): Convert JSX to HTML instantly in your browser. Turns className to class, style objects to inline styles, and camelCase attributes back to plain HTML. Free, no signup.
- [JWK to PEM Converter](https://devtoollab.com/tools/jwk-pem-converter): Convert JWK to PEM and PEM to JWK for RSA and EC keys instantly in your browser using the Web Crypto API. No signup, keys never leave your device. Free online JWK PEM converter.
- [Kubernetes Memory Units Converter](https://devtoollab.com/tools/kubernetes-memory-units-converter): Kubernetes memory units converter for Mi, Gi, M, m and e notation. Paste a manifest to get bytes and millicores and catch 512M vs 512Mi mistakes. Free.
- [Leet Speak Translator](https://devtoollab.com/tools/leet-speak-translator): Leet speak translator converts text to 1337 at three intensity levels and decodes leet back to plain English. Works both ways in your browser, free, no signup required.
- [Length Converter](https://devtoollab.com/tools/length-converter): Convert length and distance between metric and imperial units. Convert cm to inches, feet to meters, miles to kilometers, and more.
- [Line Ending Converter](https://devtoollab.com/tools/line-ending-converter): Line ending converter switches files between CRLF, LF, and CR, counts what it found, and flags mixed endings. Free, browser-based, no upload required.
- [List to Comma Separated Converter](https://devtoollab.com/tools/list-to-comma-separated): List to comma separated converter joins a column of values into one line, a quoted SQL IN list or a JSON array, and splits delimited values back into a list. Free, instant.
- [Logfmt Parser](https://devtoollab.com/tools/logfmt-parser): Logfmt parser that converts key=value log lines into JSON. Handles quoted values, escape sequences, bare keys and mixed types. Free, in your browser.
- [Lua Table to JSON Converter](https://devtoollab.com/tools/lua-table-to-json): Convert a Lua table to JSON, or JSON to a Lua table, in your browser. Handles nested tables, long strings, hex numbers and big integers exactly. Free.
- [Markdown to HTML Converter](https://devtoollab.com/tools/markdown-to-html): Free online tool to convert Markdown text to HTML. Simple, fast, and secure - no registration required. Process your data locally for complete privacy.
- [Markdown to PDF Converter Online](https://devtoollab.com/tools/markdown-to-pdf): Convert Markdown files to beautifully formatted PDF documents. Supports GitHub Flavored Markdown, code blocks with syntax highlighting, tables, and custom page sizes.
- [Markdown to reStructuredText](https://devtoollab.com/tools/markdown-to-rst): Convert Markdown to reStructuredText (RST) instantly online. Perfect for Python Sphinx docs, ReadTheDocs, and PyPI package README files. Free, browser-based, no signup.
- [Markdown to Slack](https://devtoollab.com/tools/markdown-to-slack): Convert Markdown to Slack mrkdwn formatting instantly. Handles bold, italic, code blocks, links, lists, and headings. Paste directly into Slack. Free, browser-based.
- [Markdown to Text Converter](https://devtoollab.com/tools/markdown-to-text): Convert Markdown content into clean plain text by removing headings, links, code blocks, and formatting while preserving readable output.
- [MessagePack to JSON Converter](https://devtoollab.com/tools/messagepack-to-json): MessagePack to JSON converter that decodes msgpack hex, Base64 or files and encodes JSON back to MessagePack. Handles uint64, binary and timestamps. Free.
- [Morse Code Translator](https://devtoollab.com/tools/morse-code-translator): Translate text to Morse code and Morse code to text instantly. Supports international standard for learning and fast conversion.
- [MySQL to PostgreSQL Converter](https://devtoollab.com/tools/mysql-to-postgresql-converter): MySQL to PostgreSQL converter turns CREATE TABLE dumps into Postgres DDL: type mapping, AUTO_INCREMENT to identity, indexes split out. Free, runs in your browser.
- [NATO Phonetic Alphabet Converter](https://devtoollab.com/tools/nato-phonetic-alphabet): Convert any text to the NATO phonetic alphabet (Alpha, Bravo, Charlie...). Instantly spell out letters, numbers, and words using the ICAO military alphabet.
- [NDJSON to JSON Converter Online](https://devtoollab.com/tools/ndjson-to-json-converter): Convert newline-delimited JSON or JSON Lines data into a standard JSON array with line-specific validation and pretty-print output.
- [Number Base Converter](https://devtoollab.com/tools/number-base-converter): Number base converter - switch between binary, octal, decimal, and hex instantly. Essential for developers, free and browser-based.
- [Number to Words Converter](https://devtoollab.com/tools/number-to-words): Convert any number to its written English word form. Supports integers, decimals, negative numbers, ordinals, and currency formatting.
- [OKLCH Color Converter](https://devtoollab.com/tools/oklch-color-converter): Convert HEX, RGB, and HSL colors to OKLCH instantly with live gamut mapping and WCAG contrast checks. Free, client-side color tool, no signup, built for Tailwind v4.
- [OpenAPI to Markdown](https://devtoollab.com/tools/openapi-to-markdown): Convert OpenAPI 3.x and Swagger 2.x JSON specs to readable Markdown API documentation. Extracts endpoints, parameters, and responses. Free, browser-based.
- [OpenAPI to Postman Collection](https://devtoollab.com/tools/openapi-to-postman-collection): OpenAPI to Postman collection converter turns OpenAPI 3.x or Swagger 2.x specs into a ready-to-import Postman v2.1 JSON file with params and bodies. Free, browser-based.
- [OpenAPI to TypeScript Converter](https://devtoollab.com/tools/openapi-to-typescript): OpenAPI to TypeScript converter generates interfaces, unions and request or response types from any OpenAPI 3.x or Swagger 2.0 spec. Free, no signup, browser based.
- [PDF to Image Converter Online](https://devtoollab.com/tools/pdf-to-image): Convert PDF pages to high-resolution PNG or JPG images directly in your browser. Preview each page, choose output quality, and download one page or the full set.
- [PDF to RAW Converter](https://devtoollab.com/tools/pdf-to-raw): Convert PDF pages to raw uncompressed RGBA pixel data in your browser. Render every page at a custom scale and export headerless .raw byte streams, single page or ZIP. Free, no upload required.
- [PDF to Text Extractor](https://devtoollab.com/tools/pdf-to-text): PDF to text extractor pulls plain text from any PDF file directly in your browser, page by page. Free, fast, no upload, works with multi-page documents.
- [PFX to PEM Converter](https://devtoollab.com/tools/pfx-to-pem-converter): PFX to PEM converter that extracts the certificate, chain and key from a .pfx or .p12 file, or builds a PFX from PEM. Opens legacy 3DES files. No upload.
- [Pig Latin Translator](https://devtoollab.com/tools/pig-latin-translator): Pig latin translator converts English to pig latin and back with the real rules, handling consonant clusters, the qu pairing and y as vowel or consonant. Free and instant.
- [Plist to JSON Converter](https://devtoollab.com/tools/plist-to-json-converter): Plist to JSON converter for Apple property list files. Handles dict, array, string, integer, real, bool, date and base64 data. Free, in-browser.
- [PNG to JPG Converter Online](https://devtoollab.com/tools/png-to-jpg): Convert PNG images to JPG/JPEG format instantly. Batch convert multiple PNG files with adjustable quality and custom background color for transparency. Free online converter.
- [PNG to RAW Converter](https://devtoollab.com/tools/png-to-raw): Convert PNG images to raw uncompressed pixel data instantly in your browser. Export RGBA, RGB, grayscale, or BGRA byte streams as headerless .raw files. Batch convert multiple PNGs, free and private.
- [PNG to SVG Converter](https://devtoollab.com/tools/png-to-svg): Convert PNG or JPG images to SVG format by embedding them in an SVG container. Perfect for creating scalable image wrappers.
- [PNG to WebP Converter Online](https://devtoollab.com/tools/png-to-webp): Convert PNG images to WebP format for smaller file sizes with excellent quality. Adjust quality, preview before downloading, and batch convert multiple images.
- [Power Converter](https://devtoollab.com/tools/power-converter): Power converter tool - convert Watts, kilowatts, horsepower, and BTU/h instantly. Free, browser-based, no install needed.
- [Pressure Converter](https://devtoollab.com/tools/pressure-converter): Pressure converter for Pascal, Bar, PSI, Atmosphere, mmHg, and Torr. Instant calculations with no install or signup - free browser-based tool.
- [Punycode Converter](https://devtoollab.com/tools/punycode-converter): Punycode converter encodes international domain names to xn-- ASCII and decodes them back, flagging mixed-script homograph lookalikes. Free, private, no signup.
- [PX to REM Converter](https://devtoollab.com/tools/px-to-rem-converter): Convert between px, rem, em, and other CSS units instantly. Set your base font size and calculate responsive CSS values for modern web design.
- [Query String to JSON Converter](https://devtoollab.com/tools/query-string-to-json): Query string to JSON converter parses URL parameters into readable JSON, handling nested brackets, repeated keys and plus-encoded spaces, and converts JSON back to a query string.
- [RAW to PNG Converter](https://devtoollab.com/tools/raw-to-png-converter): RAW to PNG converter that turns headerless RGBA, RGB, BGRA or grayscale pixel dumps into a PNG. Suggests sizes that fit the file. Nothing is uploaded.
- [Requirements.txt to pyproject.toml](https://devtoollab.com/tools/requirements-txt-to-pyproject-toml): Convert requirements.txt to pyproject.toml for uv, Poetry or pip. Keeps extras, markers, git and local sources, dev groups and package indexes. Free, private.
- [Roman Numeral Converter Online](https://devtoollab.com/tools/roman-numeral-converter): Convert numbers to Roman numerals and Roman numerals to numbers instantly. Supports values from 1 to 3,999 with real-time conversion and a handy reference chart.
- [SCSS to CSS Compiler Online](https://devtoollab.com/tools/scss-to-css): Compile SCSS and Sass to clean CSS instantly in your browser. Supports variables, nesting, mixins, and imports with real-time preview and formatted output.
- [Speech to Text](https://devtoollab.com/tools/speech-to-text): Speech to text converter transcribes live microphone audio into text instantly using your browser's built-in speech engine. Free, private, no upload, no signup.
- [Speed Converter](https://devtoollab.com/tools/speed-converter): Speed converter supporting km/h, mph, m/s, ft/s, knots, and Mach. Instant results for any velocity unit - free, no signup, works in your browser.
- [SQL to CSV Converter Online](https://devtoollab.com/tools/sql-to-csv): Convert SQL INSERT INTO statements to CSV format instantly. Parse single or multi-row inserts, handle quoted strings and NULLs, and download clean CSV files. Free online converter.
- [SQL to JSON Converter](https://devtoollab.com/tools/sql-to-json): Convert SQL INSERT statements to JSON data. Parse INSERT INTO queries and extract structured JSON objects with smart type detection.
- [SQL to MongoDB Converter](https://devtoollab.com/tools/sql-to-mongodb): Convert SQL to MongoDB queries: find() filters and aggregation pipelines for JOIN, GROUP BY, HAVING and LIKE, in mongosh, Node.js or PyMongo syntax. Free.
- [SRT to VTT Converter Online](https://devtoollab.com/tools/srt-to-vtt-converter): Convert SubRip SRT subtitles to WebVTT format instantly in the browser with timestamp normalization and optional cue number cleanup.
- [SSH Key Converter](https://devtoollab.com/tools/ssh-key-converter): Convert SSH keys between OpenSSH, PEM, PKCS#8 and RFC 4716 formats. Handles RSA, ECDSA and Ed25519 public or private keys, all in your browser. Free.
- [Subtitle Timing Shifter](https://devtoollab.com/tools/subtitle-timing-shifter): Subtitle timing shifter re-times every cue in an SRT or VTT file by any offset, with frame rate presets for captions that drift, plus SRT to VTT conversion. Free and private.
- [SVG to PNG Converter](https://devtoollab.com/tools/svg-to-png): Convert SVG vectors to high-quality PNG images online. Supports custom scaling and transparency. Free browser-based tool, no upload required.
- [SVG to React Component](https://devtoollab.com/tools/svg-to-react): Convert SVG markup to a React functional component instantly. Renames JSX attributes, adds prop spreading, and generates TypeScript or JavaScript. Free, no signup.
- [Tabs to Spaces Converter](https://devtoollab.com/tools/tabs-to-spaces-converter): Convert tabs to spaces or spaces to tabs online with a custom tab width. Only leading indentation is changed so your string content stays intact. Free, runs entirely in your browser.
- [Tailwind to CSS Converter](https://devtoollab.com/tools/tailwind-to-css): Tailwind to CSS converter expands utility classes into plain CSS, with media queries, hover and dark variants, spacing, colors and shadows all resolved. No build step.
- [Temperature Converter](https://devtoollab.com/tools/temperature-converter): Temperature converter for Celsius, Fahrenheit, and Kelvin. Get instant results with formula breakdowns - free, browser-based, no install needed.
- [Text Case Converter](https://devtoollab.com/tools/text-case-converter): Convert text between different cases: uppercase, lowercase, title case, camelCase, snake_case, and more. Instant text formatting tool.
- [Text to Binary Converter Online](https://devtoollab.com/tools/text-to-binary): Convert text to binary code and binary back to text instantly. Translate any string into its 8-bit binary ASCII representation. Essential tool for computer science and programming.
- [Text to Bullet Points Converter](https://devtoollab.com/tools/text-to-bullet-points): Convert plain text lines to formatted bullet points in Markdown, HTML, numbered lists, and more. Supports custom bullet symbols and one-click copy for documentation, READMEs, and web pages.
- [Text to CSV Converter Online](https://devtoollab.com/tools/text-to-csv-converter): Convert tab, comma, pipe, semicolon, or spaced text into valid CSV format. Copy or download clean CSV output for spreadsheets and data imports.
- [Text to HTML Converter](https://devtoollab.com/tools/text-to-html): Convert plain text to HTML with automatic paragraph tags, line breaks, link detection, and special character encoding. Free online text to HTML tool.
- [Text to JSON Converter](https://devtoollab.com/tools/text-to-json-converter): Text to JSON converter: turn a TXT file, plain-text lines or key: value pairs into a JSON array or object. Handles CSV and custom delimiters. Free, no upload.
- [Text to PDF Converter Online](https://devtoollab.com/tools/text-to-pdf): Convert plain text to PDF online for free. Customize font size, page margins, and page size. Generate and download PDF files instantly. 100% browser-based.
- [Text to Speech Online](https://devtoollab.com/tools/text-to-speech): Convert text to speech online for free. Choose from multiple voices, adjust speed, pitch, and volume. Listen to articles, proofread text, or practice pronunciation - all in your browser.
- [TIFF to PDF Converter](https://devtoollab.com/tools/tiff-to-pdf): Convert TIFF and multi-page TIF images to a single PDF document in your browser. Combines multiple files and pages, fit to A4 or match image size. Free, private, and no signup required.
- [Time Zone Converter](https://devtoollab.com/tools/time-zone-converter): Convert times between any time zones worldwide. Features a live world clock, quick reference for popular zones, and daylight saving time support.
- [TOML to JSON Converter](https://devtoollab.com/tools/toml-to-json): Convert TOML configuration files to JSON format and vice versa. Perfect for working with Cargo.toml, pyproject.toml, and other config files.
- [TOML to YAML Converter](https://devtoollab.com/tools/toml-to-yaml): Convert TOML configuration files to YAML format instantly in your browser. Supports Cargo.toml, pyproject.toml, and all TOML spec types. Free, no signup required.
- [TypeScript to JavaScript Converter](https://devtoollab.com/tools/typescript-to-javascript): Strip TypeScript type annotations, interfaces, generics, and type imports to get clean JavaScript. Handles common TS syntax patterns. Free, runs in-browser.
- [TypeScript to Zod](https://devtoollab.com/tools/typescript-to-zod): Convert TypeScript interfaces and type aliases to Zod validation schemas automatically. Supports optional fields, union types, arrays, nested objects, enums, Record, and generic types.
- [Unix Timestamp Converter Online](https://devtoollab.com/tools/unix-timestamp-converter): Free Unix timestamp converter to convert epoch time to date and date to timestamp. Support for seconds, milliseconds, and multiple timezones.
- [VCF to CSV Converter](https://devtoollab.com/tools/vcf-to-csv-converter): Convert VCF to CSV in your browser: turn an iPhone, Android or Outlook vCard export into a spreadsheet of names, phones, emails and addresses. Free, private.
- [Volume Converter](https://devtoollab.com/tools/volume-converter): Volume converter for liters, gallons, cups, tablespoons, and more units. Get instant results for cooking or science - free, no signup required.
- [WASM to WAT Converter](https://devtoollab.com/tools/wasm-to-wat): Convert WASM to WAT online: disassemble a WebAssembly binary into readable text with imports, exports, function names and SIMD. Runs in your browser. Free.
- [WebP to JPG Converter Online](https://devtoollab.com/tools/webp-to-jpg): Convert WebP images to JPG online for free. Batch-convert files, adjust output quality, choose a background for transparency, and download JPEGs instantly in your browser.
- [WebP to PNG Converter Online](https://devtoollab.com/tools/webp-to-png): Convert WebP images to PNG format instantly. Batch convert multiple WebP files with transparency support. Free online converter, no upload needed.
- [Weight Converter](https://devtoollab.com/tools/weight-converter): Weight converter for kilograms, pounds, ounces, stones, and more. Instant mass conversions in your browser - free tool, no install or login needed.
- [WKT to GeoJSON Converter](https://devtoollab.com/tools/wkt-to-geojson-converter): WKT to GeoJSON converter that runs both ways in your browser. Handles points, polygons, multi-geometries, Z coordinates, EWKT SRID and GeometryCollection.
- [XML to CSV Converter](https://devtoollab.com/tools/xml-to-csv): Convert XML files to CSV format easily. Extract data from nested XML structures into a clean, flat CSV table with customizable delimiters.
- [XML to JSON Converter](https://devtoollab.com/tools/xml-to-json): Transform XML documents into clean JSON objects instantly. Handles attributes, nested elements, namespaces, and CDATA sections. Privacy-first - all processing done in your browser.
- [XML to YAML Converter](https://devtoollab.com/tools/xml-to-yaml): Convert XML documents to YAML format instantly in your browser. Handles nested elements, attributes, arrays, and mixed content. Free, no upload required.
- [YAML to JSON Converter](https://devtoollab.com/tools/yaml-to-json): Convert YAML files to JSON format instantly with custom indentation and formatting options. Supports multi-document YAML, anchors, and aliases. Free, private, and no signup required.
- [YAML to Properties Converter](https://devtoollab.com/tools/yaml-to-properties): YAML to properties converter turns Spring Boot application.yml into flat key=value properties and back to nested YAML, keeping list indexes and escapes. Free, no upload.
- [YAML to TOML Converter](https://devtoollab.com/tools/yaml-to-toml): Convert YAML configuration files to TOML format in your browser. Handles nested tables, arrays, scalars, and array-of-tables sections. Free, no upload required.

### Decoders
- [ASN.1 Decoder Online](https://devtoollab.com/tools/asn1-decoder): ASN.1 decoder for DER and PEM: view certificates, keys, CSRs and PKCS #7 as a tree of tags, lengths, OIDs and values. Runs in your browser, nothing uploaded.
- [Base64 to Image Decoder Online](https://devtoollab.com/tools/base64-to-image): Convert Base64 strings to images instantly. Visualize Base64 image data and download as image files. Support for PNG, JPG, GIF, WebP, and SVG.
- [CBOR Decoder Online](https://devtoollab.com/tools/cbor-decoder): CBOR decoder online: turn CBOR hex or Base64 into diagnostic notation, JSON or annotated hex. Decodes WebAuthn, COSE and CWT payloads in your browser. Free.
- [Certificate Decoder](https://devtoollab.com/tools/certificate-decoder): Decode an X.509 PEM certificate to view its subject, issuer, validity, serial number, public key, SANs, and SHA-1/SHA-256 fingerprints. Private, client-side decoding.
- [Cipher Decoder](https://devtoollab.com/tools/cipher-decoder): Cipher decoder that tries Caesar, ROT13, Atbash, ROT47, Base64, hex, Morse and A1Z26 on your text and ranks every result by English fit. Free and private.
- [CSR Decoder](https://devtoollab.com/tools/csr-decoder): CSR decoder reads the subject, public key algorithm and size, and requested SANs from a PEM certificate signing request, and verifies its self-signature. Free, no signup.
- [Data URI Parser](https://devtoollab.com/tools/data-uri-parser): Data URI parser that decodes any data: URL in your browser. See the MIME type, charset, base64 flag, decoded size and base64 overhead. Free.
- [JWT Decoder](https://devtoollab.com/tools/jwt-decoder): Decode JSON Web Tokens (JWT) to view header, payload, and signature. Check token expiration and validate JWT format. Free, secure, and privacy-first.
- [Kubernetes Secret Decoder](https://devtoollab.com/tools/kubernetes-secret-decoder): Kubernetes secret decoder reveals every Base64 value in a Secret manifest at once, exports to .env or stringData, and encodes plain values back into a ready-to-apply Secret.
- [Lua Decompiler](https://devtoollab.com/tools/lua-decompiler): Lua decompiler that turns Lua 5.1 .luac bytecode back into readable source, with loops, if/elseif chains, and/or logic and local names. Free, in-browser.
- [MIME Header Decoder](https://devtoollab.com/tools/mime-header-decoder): MIME header decoder that turns RFC 2047 encoded-words like =?UTF-8?B?...?= back into readable email subject and sender lines. Free, in-browser.
- [MongoDB ObjectId Decoder](https://devtoollab.com/tools/mongodb-objectid-decoder): MongoDB ObjectId decoder extracts the creation timestamp, random value and counter from any ObjectId, and builds boundary IDs for date range queries. Free, no signup.
- [Protobuf Decoder](https://devtoollab.com/tools/protobuf-decoder): Protobuf decoder that reads raw Protocol Buffers bytes with no .proto schema. Paste hex or Base64, or drop a .pb file, and see field numbers, wire types and nested messages.
- [React Error Decoder](https://devtoollab.com/tools/react-error-decoder): Decode a minified React production error code into its full development message. Paste the number or the error URL and see exactly what broke. Free.
- [SAML Decoder](https://devtoollab.com/tools/saml-decoder): SAML decoder that turns a SAMLRequest or SAMLResponse into readable XML in your browser. Handles URL encoding, Base64 and raw DEFLATE, then pulls out Issuer, ACS URL and NameID.
- [Snowflake ID Decoder](https://devtoollab.com/tools/snowflake-id-decoder): Decode Discord, Twitter/X, and Instagram snowflake IDs into timestamps and worker IDs instantly in your browser. Free, no signup, bulk decoding supported.
- [SSH Key Fingerprint Calculator](https://devtoollab.com/tools/ssh-key-fingerprint-calculator): Calculate SSH key fingerprints (MD5 and SHA256) from any OpenSSH public key instantly in your browser. Verify server or GitHub keys match ssh-keygen output. Free, no signup.
- [UUID Decoder](https://devtoollab.com/tools/uuid-decoder): UUID decoder identifies the version and variant of any UUID and extracts the creation timestamp from v1, v6 and v7 identifiers, plus clock sequence and node. Free and private.
- [WebAuthn Debugger](https://devtoollab.com/tools/webauthn-debugger): Decode WebAuthn passkey attestation and assertion responses into readable flags, AAGUID, and COSE keys. Free client-side debugger, no signup, no data leaves your browser.

### Editors
- [Markdown Editor](https://devtoollab.com/tools/markdown-editor): Write and preview Markdown in real-time with a split-pane editor. Supports GitHub Flavored Markdown, tables, code blocks, and export to HTML.

### Encoders
- [Ascii85 Encoder & Decoder](https://devtoollab.com/tools/ascii85-encoder-decoder): Ascii85 encoder and decoder with Adobe, btoa and RFC 1924 Base85 variants. Built for PDF streams and Git binary patches. Free, runs in your browser.
- [Atbash Cipher](https://devtoollab.com/tools/atbash-cipher): Atbash cipher encoder and decoder that mirrors the alphabet, A to Z and B to Y, with the full mapping table shown. Keeps case, digits and punctuation. Free.
- [Base32 Encoder Decoder Online](https://devtoollab.com/tools/base32-encoder-decoder): Encode text to Base32 or decode Base32 strings back to UTF-8. Supports RFC 4648 alphabet, optional padding, copy, and download.
- [Base58 Encoder Decoder Online](https://devtoollab.com/tools/base58-encoder-decoder): Encode UTF-8 text to Base58 or decode Base58 strings used in crypto wallets and compact IDs - browser-based, no data leaves your device.
- [Base64 Encoder Decoder](https://devtoollab.com/tools/base64-encoder-decoder): Free online tool to encode or decode Base64 data. Fast, private, and easy to use with no login required. All processing happens in your browser.
- [Caesar Cipher Encoder Decoder Online](https://devtoollab.com/tools/caesar-cipher): Encrypt or decrypt text with the Caesar cipher. Choose any shift from 1-25, use ROT13 instantly, and copy the result in one click.
- [HTML Decoder and Encoder](https://devtoollab.com/tools/html-encoder-decoder): HTML decoder and encoder for HTML entities. Decode escaped markup back to readable text, deobfuscate entity-encoded HTML, or encode text safely. Free.
- [HTML Entity Encoder Decoder](https://devtoollab.com/tools/html-entity-encoder-decoder): Encode and decode HTML entities instantly in your browser. Converts <, >, &, ", and 20+ named entities. Supports numeric encoding for Unicode characters. Free, no signup.
- [Polyline Decoder and Encoder](https://devtoollab.com/tools/polyline-encoder-decoder): Polyline decoder and encoder for the Google encoded polyline format, precision 5 or 6. Converts to lat/lng, JSON or GeoJSON with distance and a route preview.
- [Quoted-Printable Encoder Decoder](https://devtoollab.com/tools/quoted-printable-encoder-decoder): Quoted-printable encoder and decoder for MIME email bodies. Handles =XX escapes, soft line breaks at 76 columns and UTF-8 text. Free, no signup.
- [ROT13 Encoder Decoder](https://devtoollab.com/tools/rot13-encoder-decoder): ROT13 encoder and decoder with ROT47, ROT5, ROT18 and any custom ROT-N shift. Encode or decode text as you type and see the letter mapping. Free, no signup.
- [String Escape/Unescape Tool](https://devtoollab.com/tools/string-escape-unescape): String escape and unescape tool for JS, JSON, HTML, URL, XML, SQL, and regex. Browser-based, handles special characters easily.
- [Text Encryption & Decryption](https://devtoollab.com/tools/text-encryption): Encrypt and decrypt text using AES-256 encryption. Secure your sensitive data with password-based encryption in your browser.
- [URL Encoder Decoder](https://devtoollab.com/tools/url-encoder-decoder): Free online tool to encode or decode URL components. Fast, private, and easy to use with no login required. All processing happens in your browser.
- [Vigenere Cipher](https://devtoollab.com/tools/vigenere-cipher): Vigenere cipher tool encrypts and decrypts text with any keyword, preserves case and punctuation, and shows the key stream lined up under your message. Free, no signup.

### Encoders Decoders
- [Base62 Encoder Decoder](https://devtoollab.com/tools/base62-encoder-decoder): Encode numbers or text to Base62 and decode strings back instantly in your browser. Ideal for URL shorteners and short IDs. Free, no signup, bulk conversion.
- [Base64URL Encoder Decoder Online](https://devtoollab.com/tools/base64url-encoder-decoder): Encode or decode URL-safe Base64 strings used in JWTs, OAuth tokens, and signed URLs - runs in your browser, no data sent.

### Formatters
- [Bash Formatter](https://devtoollab.com/tools/bash-formatter): Format and beautify bash and shell scripts instantly in your browser. Auto-indent if, for, while, case, and function blocks, preserve here-docs, and trim trailing whitespace. Free, private, no upload.
- [CSS Beautifier & Formatter](https://devtoollab.com/tools/css-beautifier): Format and beautify CSS code with customizable indentation, brace style, and selector formatting. The opposite of CSS minifier.
- [GraphQL Formatter Minifier Online](https://devtoollab.com/tools/graphql-formatter): Format GraphQL queries, mutations, subscriptions, and fragments or minify GraphQL documents for compact API and frontend code usage.
- [HTML Formatter & Beautifier](https://devtoollab.com/tools/html-formatter): Format and beautify HTML code with proper indentation and structure. Clean up messy HTML, fix nesting, and make your markup readable instantly.
- [JavaScript Beautifier](https://devtoollab.com/tools/javascript-beautifier): Format and beautify JavaScript code instantly with customizable indentation, brace style, and line length settings. Works with ES6+, JSX, and modern JS syntax. Free and private.
- [JavaScript Deobfuscator](https://devtoollab.com/tools/javascript-deobfuscator): JavaScript deobfuscator decodes hex escapes, String.fromCharCode, base64 payloads and string-array lookups, then re-indents the code. Every change is syntax checked in the browser.
- [JSON Escape & Unescape Online](https://devtoollab.com/tools/json-escape-unescape): Escape and unescape JSON strings online. Convert special characters like quotes, backslashes, newlines, and tabs to their JSON-safe equivalents instantly.
- [JSON Formatter & Validator](https://devtoollab.com/tools/json-formatter): Format, validate, and beautify JSON data with instant results and error highlighting. Supports nested objects and arrays. Free, browser-based, no signup required.
- [JSON Parser Online](https://devtoollab.com/tools/json-parse-online): Parse, validate, and format JSON strings with detailed error reporting and line number highlighting. Instantly detect syntax errors in malformed JSON. Free online tool, no signup needed.
- [JSON Sort Keys](https://devtoollab.com/tools/json-sort-keys): Sort JSON object keys alphabetically and recursively in your browser, with ascending or descending order and custom indentation. Produce clean, diff-friendly JSON. Free, no signup.
- [JSON Stringify Online](https://devtoollab.com/tools/json-stringify): Stringify JSON objects with custom formatting, sort keys, escape Unicode, and parse stringified JSON strings back to objects. Real-time conversion with validation.
- [SQL Formatter & Beautifier](https://devtoollab.com/tools/sql-formatter): Format and beautify SQL queries with proper indentation. Supports multiple SQL dialects including MySQL, PostgreSQL, and SQLite.
- [XML Formatter & Beautifier](https://devtoollab.com/tools/xml-formatter): XML formatter and validator - beautify or minify XML with proper indentation. Browser-based, no data sent to any server.
- [YAML Formatter & Validator](https://devtoollab.com/tools/yaml-formatter): Format, beautify, and validate YAML documents with proper indentation. Convert between different YAML styles and detect syntax errors.

### Generators
- [.env File Generator](https://devtoollab.com/tools/env-file-generator): Generate .env and .env.example files from framework templates for Next.js, Node.js, Django, FastAPI, Laravel, and more. Auto-generates cryptographically random secrets.
- [.gitattributes Generator](https://devtoollab.com/tools/gitattributes-generator): .gitattributes generator creates line-ending rules, binary file markers, Git LFS patterns, and language stats overrides for Node.js, Python, Go, and more. Free, no signup.
- [.gitignore Generator](https://devtoollab.com/tools/gitignore-generator): Generate a .gitignore file by selecting your tech stack. Supports Node.js, Python, Java, React, Go, Rust, and 20+ more frameworks.
- [AGENTS.md Generator](https://devtoollab.com/tools/agents-md-generator): AGENTS.md generator that turns your project setup, build, test and style rules into the instructions file Codex, Cursor and Claude Code read. Free.
- [AI IDE Config Generator](https://devtoollab.com/tools/cursorrules-generator): Generate .cursorrules, CLAUDE.md, and .windsurfrules config files for your project in seconds. Configure your tech stack once and get AI coding assistant rules for Cursor, Claude Code, and Windsurf.
- [ANSI Color Code Generator](https://devtoollab.com/tools/ansi-color-code-generator): Generate ANSI escape code sequences for terminal text colors and styles. Preview colored output and copy bash, Python, or Node.js color codes instantly. Free, browser-based.
- [Apache VirtualHost Generator](https://devtoollab.com/tools/apache-vhost-generator): Generate Apache HTTP Server VirtualHost configurations for HTTP and HTTPS. Add SSL, proxy pass, and custom headers. Free Apache config generator, no signup required.
- [API Key Generator](https://devtoollab.com/tools/api-key-generator): API key generator that creates cryptographically secure keys in your browser with crypto.getRandomValues. Set a prefix, length, and character set, generate up to 100 at once, see entropy in bits.
- [App Icon Generator](https://devtoollab.com/tools/app-icon-generator): App icon generator resizes one logo into every iOS, Android and PWA icon size, with AppIcon.appiconset, Contents.json and mipmap folders in one ZIP. Free and private.
- [AWS IAM Policy Generator](https://devtoollab.com/tools/aws-iam-policy-generator): Generate AWS IAM policy JSON documents online. Add multiple statements with Allow or Deny effects, service actions, and resource ARNs. Free, runs fully in your browser.
- [Barcode Generator](https://devtoollab.com/tools/barcode-generator): Barcode generator supporting Code128, EAN-13, UPC-A, Code39, and ITF formats. Download as PNG or SVG, free and browser-based.
- [Bash Script Generator](https://devtoollab.com/tools/bash-script-generator): Generate production-ready bash script boilerplate with strict error handling, argument parsing, color logging, and cleanup traps. Configurable features. Free, browser-based, no signup.
- [Basic Auth Header Generator](https://devtoollab.com/tools/basic-auth-header-generator): Basic auth header generator builds the Authorization: Basic header from a username and password, with curl and fetch snippets, and decodes existing headers back to credentials.
- [Bcrypt Generator](https://devtoollab.com/tools/bcrypt-generator): Bcrypt generator hashes passwords with a chosen cost factor and verifies existing bcrypt hashes in your browser. Compatible with PHP, Node, Python and Spring. Free, no signup.
- [Business Name Generator Online](https://devtoollab.com/tools/business-name-generator): Generate creative, brandable business name ideas instantly. Choose from modern, classic, creative, tech, or luxury styles. Enter a keyword for targeted results.
- [Caddyfile Generator](https://devtoollab.com/tools/caddyfile-generator): Generate a Caddyfile for the Caddy web server with automatic HTTPS, reverse proxy, static file serving, and custom headers. Free, no signup, runs in your browser.
- [Changelog Generator](https://devtoollab.com/tools/changelog-generator): Convert conventional git commit messages into a formatted CHANGELOG.md instantly. Supports Keep a Changelog, GitHub Release Notes, and Simple formats. Free, browser-based, no signup.
- [Code to Image Converter](https://devtoollab.com/tools/code-to-image): Turn code snippets into beautiful images. Choose from multiple themes, languages, and backgrounds. Export as PNG for sharing on social media.
- [Color Palette Generator Online](https://devtoollab.com/tools/color-palette-generator): Generate beautiful color palettes using color theory. Choose from complementary, analogous, triadic, split-complementary, tetradic, and monochromatic harmonies. Export as CSS or Tailwind config.
- [Color Picker & Palette Generator](https://devtoollab.com/tools/color-picker): Professional color picker tool with multiple format support, palette management, and advanced color manipulation features. Perfect for designers and developers.
- [Color Shade Generator Online](https://devtoollab.com/tools/color-shade-generator): Generate tints and shades from any color. Create a full color scale and export as CSS variables, Tailwind config, or SVG palette. Free online tool.
- [Conventional Commits Generator](https://devtoollab.com/tools/conventional-commits-generator): Build conventional commit messages with the correct format instantly. Supports feat, fix, chore, docs, refactor types with scope, breaking changes, and footer notes. Free, browser-based.
- [Cookie Consent Generator](https://devtoollab.com/tools/cookie-consent-generator): Cookie consent generator that builds a drop-in banner with HTML, CSS and vanilla JavaScript. Configure categories, storage key and CCPA text. Free.
- [CORS Header Generator](https://devtoollab.com/tools/cors-header-generator): Generate CORS headers and middleware code for Express.js, FastAPI, Nginx, and Django. Configure allowed origins, methods, headers, and credentials instantly in your browser.
- [Cover Letter Generator](https://devtoollab.com/tools/cover-letter-generator): Generate a professional cover letter in seconds. Fill in your details and get a polished, ready-to-send cover letter tailored to any job application.
- [CRC32 Hash Calculator](https://devtoollab.com/tools/crc32-hash-calculator): Calculate the CRC32 checksum of any text online. Returns the standard CRC-32/ISO-HDLC value used by zip, gzip, and PNG as hex and decimal. Free, instant, and fully client-side.
- [Cron Expression Generator](https://devtoollab.com/tools/cron-expression-generator): Generate cron expressions visually. Interactive UI for configuring minutes, hours, days, months, and weekdays for job scheduling.
- [CSP Generator](https://devtoollab.com/tools/csp-generator): Build Content-Security-Policy headers and meta tags with common directives, reporting options, and quick security warnings.
- [CSR Generator](https://devtoollab.com/tools/csr-generator): CSR generator that creates a certificate signing request and private key in your browser. RSA or ECDSA keys, multiple SANs, wildcards and the openssl command.
- [CSS Border Radius Generator](https://devtoollab.com/tools/css-border-radius-generator): Create perfect rounded corners with visual editor. Generate CSS border-radius for all corners individually or uniformly with support for pixels and percentages.
- [CSS Box Shadow Generator](https://devtoollab.com/tools/css-box-shadow-generator): Generate CSS box shadows with visual editor. Create single or multiple shadow layers with control over offset, blur, spread, and color.
- [CSS Clamp Calculator Online](https://devtoollab.com/tools/css-clamp-calculator): Generate responsive CSS clamp() values for fluid typography, spacing, padding, and layout sizes without manual viewport math.
- [CSS Clip-Path Generator](https://devtoollab.com/tools/css-clip-path-generator): Create custom CSS clip-path shapes with visual editor. Generate circles, ellipses, polygons, and inset shapes for creative web designs.
- [CSS Container Query Generator](https://devtoollab.com/tools/css-container-query-generator): Build and preview CSS container queries live with a resizable @container playground. Generate copy-ready code client-side, free, no signup, for responsive components.
- [CSS Cube Generator](https://devtoollab.com/tools/css-cube-generator): Create stunning 3D CSS cubes with visual editor. Generate complete HTML and CSS code for interactive 3D cube animations.
- [CSS Filter Generator Online](https://devtoollab.com/tools/css-filter-generator): Generate CSS filter effects with a live visual preview. Adjust blur, brightness, contrast, grayscale, hue-rotate, sepia, and more - then copy the ready-to-use CSS code instantly.
- [CSS Flexbox Playground](https://devtoollab.com/tools/css-flexbox-playground): Interactive tool to learn and experiment with CSS Flexbox layouts. Visualize flex container and item properties in real-time.
- [CSS Glassmorphism Generator](https://devtoollab.com/tools/css-glassmorphism-generator): Create stunning glassmorphism effects with visual editor. Generate modern glass-like UI elements with backdrop blur, transparency, and customizable properties.
- [CSS Gradient Generator](https://devtoollab.com/tools/css-gradient-generator): Create beautiful CSS gradients with visual editor. Generate linear, radial, and conic gradients with multiple color stops and customizable angles.
- [CSS Gradient Text Generator Online](https://devtoollab.com/tools/css-gradient-text-generator): Create beautiful gradient text effects with CSS. Customize colors, direction, font size, and weight with a live preview. Copy CSS or HTML code instantly.
- [CSS Grid Generator Online](https://devtoollab.com/tools/css-grid-generator): Create CSS Grid layouts visually with interactive controls. Customize columns, rows, gaps, and item spans with live preview and instant code generation.
- [CSS Keyframe Animation Generator](https://devtoollab.com/tools/keyframe-animation-generator): CSS keyframe animation generator lets you build complex animations visually with real-time preview. Adjust timing, easing, and properties, then copy the code.
- [CSS Keyframes Generator](https://devtoollab.com/tools/css-keyframes-generator): CSS keyframes generator builds @keyframes animations visually with live preview, easing curves, and duration control. Copy ready-to-use CSS. Free, no signup.
- [CSS Loader Generator](https://devtoollab.com/tools/css-loader-generator): Generate pure CSS loading animations - spinners, dots, pulse, bars, ripple, and ellipsis. Customize color, size, and speed. Copy CSS and HTML instantly.
- [CSS Media Query Generator](https://devtoollab.com/tools/css-media-query-generator): CSS media query generator builds responsive breakpoints visually with a live preview at every screen size. Copy ready-to-use media queries. Free, no signup.
- [CSS Neumorphism Generator Online](https://devtoollab.com/tools/css-neumorphism-generator): Create stunning neumorphic / soft UI CSS effects with a visual editor. Customize color, shadows, blur, size, and shape - then copy the ready-to-use CSS code instantly.
- [CSS Scrollbar Generator](https://devtoollab.com/tools/css-scrollbar-generator): CSS scrollbar generator builds custom scrollbar styles with a live preview, covering webkit scrollbar rules plus Firefox scrollbar-width and scrollbar-color. Free tool.
- [CSS Text Shadow Generator Online](https://devtoollab.com/tools/css-text-shadow-generator): Create stunning CSS text shadow effects with a visual editor. Generate single or multiple text shadows with customizable offset, blur, and color. Preview in real-time and copy the CSS code.
- [CSS Transform Generator](https://devtoollab.com/tools/css-transform-generator): CSS transform generator builds translate, rotate, scale, skew and 3D perspective rules with a live preview and copyable CSS. Free, runs in your browser.
- [CSS Transition Generator Online](https://devtoollab.com/tools/css-transition-generator): Build CSS transition declarations visually. Set property, duration, timing function, and delay, then preview the animation and copy the CSS.
- [CSS Triangle Generator](https://devtoollab.com/tools/css-triangle-generator): Create pure CSS triangles using border tricks. Generate triangles pointing in any direction with customizable size and color.
- [cURL Command Generator](https://devtoollab.com/tools/curl-command-generator): Build cURL commands with method, headers, query params, auth, and body. Generate copy-ready shell requests for APIs and debugging.
- [Cursive Text Generator Online](https://devtoollab.com/tools/cursive-text-generator): Generate cursive, script, fraktur, and double-struck text using Unicode. Copy and paste fancy cursive text anywhere - social media, bios, messages, and more.
- [Cypress Config Generator](https://devtoollab.com/tools/cypress-config-generator): Cypress config generator for cypress.config.ts: E2E and component testing, base URL, viewport, video, retries, and env variables. Free, browser-based.
- [Dependabot.yml Generator](https://devtoollab.com/tools/dependabot-config-generator): Dependabot.yml generator builds a .github/dependabot.yml with ecosystems, schedules, grouping and ignore rules for automated dependency updates. Free.
- [Devcontainer.json Generator](https://devtoollab.com/tools/devcontainer-json-generator): Devcontainer.json generator builds a VS Code and Codespaces dev container config with features, forwarded ports, extensions and post-create commands.
- [Digital Business Card Generator](https://devtoollab.com/tools/digital-business-card): Generate shareable digital business cards in .vcf format. Add contact details and download a vCard file users can import directly into phone contacts.
- [Discord Embed Generator](https://devtoollab.com/tools/discord-embed-generator): Build Discord embed JSON for webhooks with a live preview of colors, fields, thumbnails, and footers. Free browser-based Discord embed generator, no signup needed.
- [Discord Timestamp Generator](https://devtoollab.com/tools/discord-timestamp-generator): Discord timestamp generator builds every <t:epoch:style> tag at once, with a live relative preview, so each member sees the time in their own zone. Free, no login.
- [Docker Compose Generator](https://devtoollab.com/tools/docker-compose-generator): Generate docker-compose.yml files with multiple services, ports, environment variables, volumes, and named networks. Supports build contexts, depends_on, and restart policies.
- [Docker Run Command Builder](https://devtoollab.com/tools/docker-run-command-builder): Build docker run commands with port mappings, volume mounts, environment variables, restart policies, and resource limits. Generates multi-line shell commands ready to copy. Free, browser-based.
- [Dockerfile Generator](https://devtoollab.com/tools/dockerfile-generator): Generate a production-ready Dockerfile for Node.js, Python, Go, Rust, Java, PHP, and more. Supports multi-stage builds, non-root users, HEALTHCHECK, and environment variables.
- [Dockerignore Generator](https://devtoollab.com/tools/dockerignore-generator): Generate a clean .dockerignore file for Node.js, Python, Java, Go, Rust, Next.js, React, and more. Exclude build output, logs, env files, and editor clutter.
- [Ed25519 Key Generator](https://devtoollab.com/tools/ed25519-key-generator): Generate an Ed25519 SSH key pair online in OpenSSH format, ready for GitHub, GitLab or authorized_keys, with its SHA256 fingerprint. Nothing is uploaded.
- [EditorConfig Generator](https://devtoollab.com/tools/editorconfig-generator): Generate a clean .editorconfig file for JavaScript, TypeScript, Python, Go, Java, PHP, Markdown, YAML, JSON, and more. Standardize indentation, line endings, and whitespace rules.
- [Email Signature Generator](https://devtoollab.com/tools/email-signature-generator): Create professional email signatures with name, role, contact details, social links, and copy-ready HTML - no account needed.
- [ESLint Config Generator](https://devtoollab.com/tools/eslint-config-generator): Generate ESLint configuration for any JavaScript or TypeScript project. Supports ESLint 9 flat config, legacy .eslintrc, React, Next.js, Vue 3, and common rule sets.
- [Excel Formula Generator](https://devtoollab.com/tools/excel-formula-generator): Build Excel and Google Sheets formulas by picking a task and filling in your ranges. VLOOKUP, SUMIFS, DATEDIF, TEXTJOIN, FILTER and more, each with a plain-English explanation.
- [Fake Data Generator Online](https://devtoollab.com/tools/fake-data-generator): Generate realistic fake data for testing and development. Create random names, emails, phone numbers, addresses, and more in JSON or CSV format.
- [Fancy Text Generator](https://devtoollab.com/tools/fancy-text-generator): Generate stylish Unicode text fonts for Instagram bios, Twitter posts, and social media. 18 styles including bold, italic, cursive, gothic, circled, and more.
- [Favicon Generator Online](https://devtoollab.com/tools/favicon-generator): Generate favicons from text, emoji, or initials with custom colors and sizes. Download as ICO, PNG, or SVG for your website.
- [FFmpeg Command Generator](https://devtoollab.com/tools/ffmpeg-command-generator): FFmpeg command generator with 36 ready recipes - compress, trim, convert, extract audio, resize, GIF, subtitles, HLS. Every flag explained. Free, runs in your browser.
- [Folder Tree Generator](https://devtoollab.com/tools/folder-tree-generator): Folder tree generator that turns an indented list, file paths or a real folder into an ASCII directory tree for your README. Adds comments and counts. Free.
- [Git Command Generator](https://devtoollab.com/tools/git-command-generator): Git command generator with 44 task recipes: undo the last commit, squash with rebase, force push safely, recover a deleted branch. Every flag explained, risky commands flagged.
- [GitHub Actions Generator](https://devtoollab.com/tools/github-actions-generator): Generate GitHub Actions CI/CD workflow YAML for Node.js, Python, Go, Java, and Rust. Supports tests, lint, Docker builds, and multi-branch triggers. Free online.
- [GitHub README Generator](https://devtoollab.com/tools/github-readme-generator): Generate a professional GitHub README.md file in seconds. Auto-fetch project details from any public GitHub repository, add badges, features, installation steps, and license - no boilerplate needed.
- [GitLab CI Generator](https://devtoollab.com/tools/gitlab-ci-generator): GitLab CI generator for Node, Python, Go, Java, PHP, Ruby and Rust. Builds a .gitlab-ci.yml with lockfile caching, needs: DAG, JUnit reports and a manual production gate.
- [GraphQL Query Builder](https://devtoollab.com/tools/graphql-query-builder): GraphQL query builder that writes a query or mutation from your schema SDL, with variables, nested fields and a starter variables JSON. Free and private.
- [Handwritten Signature Generator](https://devtoollab.com/tools/handwritten-signature-generator): Generate stylish handwritten signature designs from your name. Customize script style, color, size, and download as SVG or PNG.
- [Hash Generator Online](https://devtoollab.com/tools/hash-generator): Generate secure hashes with MD5, SHA-1, SHA-256, and SHA-512 algorithms. Essential for data integrity verification and security applications.
- [Heart Text Art Generator](https://devtoollab.com/tools/heart-text-art-generator): Make heart text art in 8 styles - ASCII hearts, emoji art, rose art and love messages. One click to copy, then paste anywhere. Free, no signup required.
- [Helm Chart Generator](https://devtoollab.com/tools/helm-chart-generator): Helm chart generator scaffolds Chart.yaml, values.yaml and templates for Deployment, Service, Ingress and autoscaling, validated and downloadable as a ZIP. Free, no signup.
- [HMAC Generator Online](https://devtoollab.com/tools/hmac-generator): Generate HMAC signatures using SHA-256, SHA-512, MD5, and more, then export as hex, Base64, or Base64URL - fully browser-based.
- [HTML Table Generator](https://devtoollab.com/tools/html-table-generator): Create HTML tables visually with a click-to-edit interface. Add rows, columns, style with borders, and export as HTML or Markdown.
- [htpasswd Generator](https://devtoollab.com/tools/htpasswd-generator): Generate Apache and Nginx .htpasswd entries for HTTP basic auth online. Batch generate SHA-1 hashed passwords instantly. All hashing runs in-browser - passwords never leave your device.
- [HTTP Cache-Control Header Generator](https://devtoollab.com/tools/http-cache-header-generator): Generate HTTP Cache-Control headers with max-age, s-maxage, stale-while-revalidate, immutable, and more. CDN and browser caching strategies included. Free, browser-based.
- [HTTP Cookie Builder](https://devtoollab.com/tools/http-cookie-builder): Build Set-Cookie HTTP headers with all attributes - HttpOnly, Secure, SameSite, Path, Domain, Max-Age. Generate cookie headers for web development instantly. Free, no signup.
- [ICS File Generator](https://devtoollab.com/tools/ics-file-generator): ICS file generator that builds RFC 5545 iCalendar events with reminders, recurrence and time zones. Download the .ics or open it in Google Calendar. Free.
- [Import Map Generator](https://devtoollab.com/tools/import-map-generator): Generate a browser import map script tag for ES modules without a bundler. Pick esm.sh, jsDelivr, Skypack, or unpkg CDN URLs per package. Free, browser-based.
- [Invoice Generator Online Free](https://devtoollab.com/tools/invoice-generator): Create professional invoices online and download as PDF. Add your business details, client info, line items, tax, and discounts. Free invoice generator with no sign-up required.
- [Jenkinsfile Generator](https://devtoollab.com/tools/jenkinsfile-generator): Jenkinsfile generator builds a declarative Jenkins pipeline with agents, stages, triggers, environment variables and post actions. Copy or download, free, no signup.
- [JSON Patch Generator](https://devtoollab.com/tools/json-patch-generator): JSON Patch generator that diffs two JSON documents into RFC 6902 add, remove and replace operations. Apply a patch back to any document. Free.
- [JSON Schema Generator](https://devtoollab.com/tools/json-schema-generator): Generate JSON Schema from your JSON data automatically. Infer types, detect formats, and create valid schemas for validation.
- [JWT Generator Online](https://devtoollab.com/tools/jwt-generator): Generate signed JWT tokens from JSON payloads using HS256, HS384, HS512, or alg none with instant token preview and copy support.
- [JWT Signing Key Generator](https://devtoollab.com/tools/jwt-signing-key-generator): Generate RSA and EC key pairs in PEM format for signing JWTs with RS256, PS256, or ES256 directly in your browser. Free, private, no signup required.
- [kubectl Command Generator](https://devtoollab.com/tools/kubectl-command-generator): kubectl command generator with 40 recipes: get pods, crash-loop logs, exec, port-forward, rollback, drain. Every flag explained and destructive commands flagged. Free online.
- [Kubernetes YAML Generator](https://devtoollab.com/tools/kubernetes-yaml-generator): Generate Kubernetes Deployment and Service YAML manifests from a simple form. Supports resource limits, health probes, env vars, and multi-replica configs. Free, no signup.
- [Link in Bio Generator](https://devtoollab.com/tools/link-in-bio-generator): Create a customizable link-in-bio page with profile details, social links, and branded colors. Export a standalone HTML file ready for instant hosting.
- [LinkedIn Post Generator](https://devtoollab.com/tools/linkedin-post-generator): Generate structured LinkedIn posts from a topic and key points. 5 formats, 4 tones, hashtag formatting, and a live 3,000-character limit tracker. Free, no AI login needed.
- [Lorem Ipsum Generator](https://devtoollab.com/tools/lorem-ipsum-generator): Generate standard placeholder text (Lorem Ipsum) for your designs, mockups, and prototypes. Customizable paragraphs, sentences, or words.
- [Love Letter Generator](https://devtoollab.com/tools/love-letter-generator): Generate beautiful love letters for Valentine's Day, anniversaries, birthdays, and more. Choose from romantic, sweet, funny, poetic, heartfelt, or long-distance tones.
- [Makefile Generator](https://devtoollab.com/tools/makefile-generator): Generate Makefiles for Node.js, Python, Go, Rust, and Docker projects. Configurable targets: install, build, test, lint, clean, run, and docker. Free online tool.
- [Markdown Table Generator](https://devtoollab.com/tools/markdown-table-generator): Create Markdown tables visually - set columns, rows, and alignments, then copy clean markdown code instantly. No signup or install needed.
- [Markdown TOC Generator](https://devtoollab.com/tools/markdown-toc-generator): Markdown TOC generator builds a clickable table of contents from your headings with GitHub-compatible anchor links. Free, browser-based, no signup required.
- [MCP Server Config Generator](https://devtoollab.com/tools/mcp-server-config-generator): Generate a valid MCP server config JSON for Claude Desktop and Claude Code in seconds. Add stdio or remote servers, env vars, and args with zero syntax mistakes.
- [Monorepo Config Generator](https://devtoollab.com/tools/monorepo-config-generator): Monorepo config generator for Turborepo, Nx and pnpm workspaces. Produces the workspace file, pipeline config and package layout in one step. Free.
- [NanoID Generator Online](https://devtoollab.com/tools/nanoid-generator): Generate secure, URL-safe NanoIDs for databases, APIs, and public sharing links. Customize alphabet and size, then bulk-export IDs instantly in your browser.
- [NGINX Config Generator](https://devtoollab.com/tools/nginx-config-generator): Generate NGINX server configs for static sites, reverse proxies, and load balancers. Includes SSL/TLS, Gzip compression, rate limiting, CORS, and caching options.
- [npm package.json Generator](https://devtoollab.com/tools/npm-package-json-generator): Generate a valid package.json file for npm projects. Configure name, version, scripts, license, author, module type, engines, and repository fields. Auto-derives bugs and homepage from GitHub URL. Free, browser-based.
- [Open Source License Generator](https://devtoollab.com/tools/open-source-license-generator): Generate complete LICENSE files for your open-source projects. Choose from MIT, Apache 2.0, GPL 3.0, and 10+ licenses - with your name and year auto-filled from GitHub's official license templates.
- [OpenAPI Spec Generator](https://devtoollab.com/tools/openapi-generator): OpenAPI spec generator: build endpoints, methods, parameters, and response codes in a form, then export valid OpenAPI 3.0 YAML or JSON. Free, no signup.
- [OpenSSL Command Generator](https://devtoollab.com/tools/openssl-command-generator): OpenSSL command generator with 30 recipes: generate keys, build a CSR, self-sign a cert, convert PEM to PFX, check expiry. Every flag explained. Keys never leave your machine.
- [OTel Config Generator](https://devtoollab.com/tools/otel-config-generator): OTel config generator builds a valid OpenTelemetry Collector YAML from the receivers, processors and exporters you pick. Copy, download, deploy. Free.
- [Passphrase Generator Online](https://devtoollab.com/tools/passphrase-generator): Generate strong, memorable passphrases using random words. Easier to remember than random passwords while being equally secure. Entropy estimation included.
- [Password Generator Online](https://devtoollab.com/tools/password-generator): Generate strong, secure passwords with customizable length and character sets. Cryptographically secure random generation for maximum security.
- [PBKDF2 Hash Generator](https://devtoollab.com/tools/pbkdf2-hash-generator): PBKDF2 hash generator for passwords with SHA-256, SHA-512 or SHA-1. OWASP iteration defaults, random salts, hex or base64 output and hash verification. Free.
- [Permissions-Policy Generator](https://devtoollab.com/tools/permissions-policy-generator): Permissions-Policy generator that builds the HTTP header for camera, microphone, geolocation and more. Copy it as nginx, Apache, Next.js or Vercel config.
- [PKCE Code Generator](https://devtoollab.com/tools/pkce-generator): Generate OAuth 2.0 PKCE code verifiers and S256 code challenges instantly using the Web Crypto API. Build a ready-to-use authorization URL. Free, runs entirely in your browser.
- [Placeholder Image Generator](https://devtoollab.com/tools/placeholder-image-generator): Placeholder image generator - create custom images with set dimensions, colors, and text. Perfect for mockups, free to use.
- [Playwright Config Generator](https://devtoollab.com/tools/playwright-config-generator): Generate playwright.config.ts for end-to-end testing. Configure browsers, base URL, retries, workers, reporters, and trace on failure. Free, browser-based.
- [Prettier Config Generator](https://devtoollab.com/tools/prettier-config-generator): Generate a Prettier config file for your JavaScript or TypeScript project. Configure print width, quotes, semicolons, trailing commas, and more. Outputs .prettierrc JSON or prettier.config.ts. Free, browser-based.
- [Privacy Policy Generator Online](https://devtoollab.com/tools/privacy-policy-generator): Generate a comprehensive privacy policy for your website or app. Supports GDPR, CCPA, and CalOPPA compliance with customizable sections for data collection, cookies, and third-party services.
- [PWA Manifest Generator](https://devtoollab.com/tools/pwa-manifest-generator): Generate a PWA web app manifest.json with icons, theme colors, and display modes instantly in your browser. Free tool, no signup, works entirely client-side.
- [QR Code Generator Online](https://devtoollab.com/tools/qr-code-generator): Create custom QR codes for URLs, text, WiFi, and more. High-quality output with customizable colors and error correction levels.
- [Random Color Generator Online](https://devtoollab.com/tools/random-color-generator): Generate random color palettes with HEX, RGB, and HSL values. Lock colors, add or remove swatches, and export as CSS variables or Tailwind config.
- [Random Joke Generator](https://devtoollab.com/tools/joke-generator): Random joke generator with programming, pun, spooky and Christmas jokes from JokeAPI. Safe mode on by default, punchline reveal and one-click copy. Free.
- [Random Name Generator Online](https://devtoollab.com/tools/random-name-generator): Generate random realistic names for testing, writing, or any project. Filter by gender, add middle names, and generate up to 100 names at once. Free online tool.
- [Random Number Generator](https://devtoollab.com/tools/random-number-generator): Generate random numbers, integers, or decimals within custom ranges. Create multiple random numbers, shuffle sequences, and use cryptographically secure generation.
- [Random Quote Generator](https://devtoollab.com/tools/random-quote-generator): Generate random inspirational and programming quotes from famous thinkers, developers, and innovators. Get 5 quotes at a time with next/previous navigation and JSON export for apps, bots, or content pipelines.
- [Random String Generator Online](https://devtoollab.com/tools/random-string-generator): Generate cryptographically secure random strings for API keys, tokens, session IDs, and more. Supports alphanumeric, hex, custom charsets, and batch generation.
- [Random User Generator](https://devtoollab.com/tools/random-user-generator): Generate up to 5000 realistic fake user profiles for API testing and development. Customise payload fields - name, email, phone, address, avatar, login, DOB - and export as JSON using the randomuser.me API.
- [Random Word Generator Online](https://devtoollab.com/tools/random-word-generator): Generate random words including nouns, verbs, and adjectives. Filter by length, starting letter, or part of speech for creative writing, games, and brainstorming.
- [React Component Generator](https://devtoollab.com/tools/react-component-generator): Generate React function component boilerplate from a props table. TypeScript or JavaScript, Tailwind or CSS Modules, typed props interface, memo() and children support. Free, no signup.
- [README Badge Generator](https://devtoollab.com/tools/readme-badge-generator): Generate shields.io badge markdown for GitHub READMEs. Create license, build, npm, coverage, and custom badges instantly. Live preview included. Free, browser-based, no signup required.
- [Receipt Generator](https://devtoollab.com/tools/receipt-generator): Receipt generator for itemized payment receipts with tax, discounts, totals and payment method. Preview, copy or download as a text file. Free.
- [Regex Generator](https://devtoollab.com/tools/regex-generator): Regex generator with 39 vetted patterns - email, URL, IPv4, IPv6, UUID, JWT, semver, dates, passwords. Live tester plus ready code for JavaScript, Python, Java, Go, PHP and grep.
- [Resume Builder Online](https://devtoollab.com/tools/resume-builder): Build a clean, ATS-friendly resume quickly with live markdown preview. Export your CV as a reusable .md file and maintain multiple role-specific versions.
- [Reverse Text Generator](https://devtoollab.com/tools/reverse-text-generator): Instantly reverse text, words, or letters. Perfect for fun, puzzles, or mirroring text. Free browser-based tool with no signup required.
- [S3 Bucket Policy Generator](https://devtoollab.com/tools/s3-bucket-policy-generator): S3 bucket policy generator that builds AWS bucket policy JSON for public read, CloudFront OAC, cross-account access and TLS-only rules. Free, no signup.
- [Self-Signed Certificate Generator](https://devtoollab.com/tools/self-signed-certificate-generator): Self-signed certificate generator for localhost and dev servers: DNS and IP SANs, RSA or ECDSA keys, a CA option and the matching OpenSSL command. Free.
- [Slugify URL Generator Online](https://devtoollab.com/tools/slugify-url-generator): Convert any text into a clean, SEO-friendly URL slug. Custom separators, lowercasing, and special character handling included.
- [Small Text Generator](https://devtoollab.com/tools/small-text-generator): Small text generator converts letters to superscript or subscript Unicode - runs in your browser with no signup. Ideal for social media bios and captions.
- [SQL Create Table Generator](https://devtoollab.com/tools/sql-create-table-generator): Generate CREATE TABLE SQL statements visually. Define columns, types, and constraints for PostgreSQL, MySQL, SQLite, and SQL Server. Free, browser-based, no signup.
- [SQL Insert Generator](https://devtoollab.com/tools/sql-insert-generator): Generate SQL INSERT statements from a JSON array. Handles strings, numbers, booleans, and nulls with proper escaping. Batch or individual mode. Free, browser-based.
- [SQL SELECT Builder](https://devtoollab.com/tools/sql-select-builder): Build SQL SELECT queries visually with columns, WHERE filters, GROUP BY, ORDER BY, and LIMIT. Generates clean SQL instantly. Free, no account required.
- [SRI Hash Generator](https://devtoollab.com/tools/sri-hash-generator): SRI hash generator creates sha256, sha384, and sha512 subresource integrity values plus the matching script tag. Free, runs locally, nothing is uploaded.
- [SSH Config Generator](https://devtoollab.com/tools/ssh-config-generator): Generate SSH config Host entries for ~/.ssh/config with IdentityFile, ProxyJump, keep-alive, port forwarding, and more. Free SSH config builder, browser-based, no signup.
- [SSH Key Generator](https://devtoollab.com/tools/ssh-key-generator): Generate RSA (2048/4096-bit) and ECDSA (P-256/P-384) SSH key pairs entirely in your browser using the Web Crypto API. Your private key never leaves your device.
- [Strikethrough Text Generator Online](https://devtoollab.com/tools/strikethrough-text-generator): Generate strikethrough text (l̶i̶k̶e̶ ̶t̶h̶i̶s̶) you can copy and paste anywhere. Supports single strike, double strike, slash, and tilde styles using Unicode characters.
- [SVG Blob Generator](https://devtoollab.com/tools/svg-blob-generator): SVG blob generator creates smooth random blob shapes with adjustable complexity, randomness, size, colors and gradients. Copy SVG code, CSS clip-path or PNG. Free, no signup.
- [SVG to Favicon](https://devtoollab.com/tools/svg-to-favicon): Convert your SVG logo to a favicon set: favicon.ico, Apple touch icon, Android Chrome icons and a site.webmanifest. Free, private, browser-based tool.
- [Systemd Service Generator](https://devtoollab.com/tools/systemd-service-generator): Generate systemd .service unit files for Linux. Configure service name, user, exec command, restart policy, and environment variables. Free, runs entirely in your browser.
- [Systemd Timer Generator](https://devtoollab.com/tools/systemd-timer-generator): Systemd timer generator and OnCalendar tester. Build a .timer unit, see the normalized form and next elapse times like systemd-analyze calendar, in any zone.
- [Tailwind Component Generator](https://devtoollab.com/tools/tailwind-component-generator): Generate Tailwind CSS snippets for buttons, cards, alerts, navbars, modals, and pricing cards. Pick a color and size, toggle HTML or JSX, dark mode and focus states included. Free online.
- [Tailwind Config Generator](https://devtoollab.com/tools/tailwind-config-generator): Generate a custom Tailwind CSS config with colors, fonts, and breakpoints in seconds. Supports both tailwind.config.js (v3) and the new v4 CSS-first theme setup.
- [Terms of Service Generator Online](https://devtoollab.com/tools/terms-of-service-generator): Generate a professional Terms of Service for your website or app. Customize clauses for user content, subscriptions, refunds, liability, and more. Free ToS template generator.
- [Terraform tfvars Generator](https://devtoollab.com/tools/terraform-tfvars-generator): Generate terraform.tfvars files from your variables.tf input. Parses variable blocks, infers types, and fills defaults or type-safe placeholders. Free, browser-based.
- [Text Repeater Online](https://devtoollab.com/tools/text-repeater): Repeat any text, word, or sentence multiple times instantly. Custom separators, line numbering, and up to 10,000 repetitions. Copy or download the result.
- [Text to ASCII Art Generator](https://devtoollab.com/tools/text-to-ascii-generator): Convert text into ASCII art with dozens of font styles - no install needed. Perfect for banners, headers, and decorative terminal text, free to use.
- [Text to Handwriting Generator](https://devtoollab.com/tools/text-to-handwriting-converter): Text to handwriting generator turns typed text into realistic handwritten notes. Choose 10 fonts, lined or grid paper and ink colors, then export PNG or PDF.
- [TOTP Generator](https://devtoollab.com/tools/totp-generator): Generate live TOTP 2FA codes from a base32 secret key. Compatible with Google Authenticator and Authy. Supports 6/8 digits and 30/60s periods. Runs entirely in your browser.
- [TypeScript Config Generator](https://devtoollab.com/tools/tsconfig-generator): Generate tsconfig.json for TypeScript projects. Presets for strict, Node.js, Next.js, React, and npm library configs. Fine-tune all compiler options in one place.
- [ULID Generator](https://devtoollab.com/tools/ulid-generator): Generate ULIDs, lexicographically sortable unique identifiers, in your browser using the Web Crypto API. Monotonic and lowercase options, bulk generation. Free ULID generator, no signup.
- [Upside Down Text Generator Online](https://devtoollab.com/tools/upside-down-text-generator): Flip your text upside down instantly. Create fun flipped text for social media bios, profiles, and messages. Free online tool, works in any browser.
- [Username Generator](https://devtoollab.com/tools/username-generator): Generate clean, brandable username ideas for Instagram, TikTok, YouTube, Twitch, LinkedIn, and more with style and separator options.
- [UUID Generator Online](https://devtoollab.com/tools/uuid-generator): Generate universally unique identifiers (UUIDs) in multiple versions and formats. Perfect for database keys, API identifiers, and unique resource naming.
- [UUID v5 Generator](https://devtoollab.com/tools/uuid-v5-generator): UUID v5 generator creates deterministic namespace-based UUIDs from a SHA-1 hash of a name and namespace, matching Python, Java, and .NET output exactly. Free, in your browser.
- [UUID v7 Generator Online](https://devtoollab.com/tools/uuid-v7-generator): Generate RFC-compatible UUID version 7 values with millisecond time ordering. Create single or bulk UUIDv7 values instantly in your browser.
- [Vite Compression Config Generator](https://devtoollab.com/tools/vite-compression-config): Generate a ready-to-use vite-plugin-compression config for gzip and Brotli asset compression. Customize threshold, filter regex, compression level, and delete-original options. Copy-paste into vite.config, free.
- [Vite Config Generator](https://devtoollab.com/tools/vite-config-generator): Generate vite.config.ts or vite.config.js for React, Vue, Svelte, Preact, Solid, and Vanilla JS projects. Includes dev server proxy, path aliases, CSS modules, and build options. Free, browser-based.
- [Vitest Config Generator](https://devtoollab.com/tools/vitest-config-generator): Generate vitest.config.ts for React, Vue, Svelte, and Node projects. Configure test environment, coverage, globals, and setup files. Free, browser-based.
- [Vue Component Generator](https://devtoollab.com/tools/vue-component-generator): Vue component generator for single-file components: Composition or Options API, TypeScript types, emits, slots, and scoped or Tailwind styling. Free.
- [WAV File Generator](https://devtoollab.com/tools/wav-file-generator): Generate and download a simple WAV audio file online. Create a pure tone, test beep, white noise, or silence with custom frequency, duration, sample rate, and bit depth. Free, no signup.
- [Webpack Config Generator](https://devtoollab.com/tools/webpack-config-generator): Generate a webpack.config.js for React, TypeScript, SCSS, and more. Includes loaders, plugins, dev server, code splitting, and the npm install command. Webpack 5 compatible. Free, browser-based.
- [Will You Be My Valentine Website](https://devtoollab.com/tools/valentine-proposal): Make a free Will You Be My Valentine website: a Yes or No page where the No button runs away. Pick a theme and song, share the link, and see their answer.
- [WireGuard Config Generator](https://devtoollab.com/tools/wireguard-config-generator): Generate WireGuard server and client configs with fresh key pairs, preshared keys and QR codes for mobile. Full or split tunnel. Keys stay in your browser.
- [Word Pluralizer](https://devtoollab.com/tools/word-pluralizer): Word pluralizer shows both the plural and singular form of any English word or phrase, covering irregular nouns, Latin loanwords, and f-to-ves exceptions. Free, browser-based.
- [YouTube Embed Checker](https://devtoollab.com/tools/youtube-embed-checker): YouTube embed checker that pulls the video ID from any YouTube URL and builds the iframe code. Live preview, nocookie privacy mode and start time.
- [Zalgo Glitch Text Generator Online](https://devtoollab.com/tools/zalgo-text-generator): Generate creepy zalgo/glitch text using Unicode combining characters. Adjust intensity and placement of glitch effects. Copy and paste corrupted text anywhere.

### Images
- [Color Blindness Simulator](https://devtoollab.com/tools/color-blindness-simulator): Simulate how people with color vision deficiencies see your images. Apply 6 scientifically accurate vision filters - Protanopia, Deuteranopia, Tritanopia, and more - entirely in your browser.
- [Exif Data Reader & Editor](https://devtoollab.com/tools/exif-viewer): View, edit, and remove hidden metadata in your photos (Exif data). Modify camera settings, location, and date information online.
- [EXIF Metadata Remover Online](https://devtoollab.com/tools/exif-remover): Remove GPS location, camera model, timestamps, and all EXIF metadata from photos instantly in your browser. Batch process images and download clean files - nothing is uploaded to any server.
- [Image Color Extractor](https://devtoollab.com/tools/image-color-extractor): Image color extractor pulls dominant colors from any image and builds a palette. Get HEX, RGB, and HSL values instantly - no upload to server required.
- [Image Cropper Online](https://devtoollab.com/tools/image-cropper): Crop images with precision using interactive selection. Supports aspect ratio presets, rotate, flip, and export to JPEG, PNG, or WebP formats.
- [Image Diff Checker](https://devtoollab.com/tools/image-diff-checker): Compare two images pixel by pixel and instantly highlight every visual difference with a diff overlay. Great for visual regression testing, free and browser-based.
- [Image Resizer](https://devtoollab.com/tools/image-resizer): Resize images to specific dimensions or percentage online. Maintain aspect ratio and download in high quality. Free, browser-based, no upload required.
- [Image Rotate & Flip Online](https://devtoollab.com/tools/image-rotate-flip): Rotate and flip images online for free. Rotate 90, 180, 270 degrees, flip horizontally or vertically, or use a custom angle. Download results instantly.
- [Image Watermark Tool Online](https://devtoollab.com/tools/image-watermark-tool): Add a text watermark to images with custom opacity, size, rotation, placement, and export format. Works locally in your browser for private image processing.
- [SVG Path Editor](https://devtoollab.com/tools/svg-path-editor): SVG path editor to drag points and Bezier handles, convert absolute and relative commands, scale, flip and minify the d attribute. Runs in your browser.

### Minifiers
- [CSS Minifier](https://devtoollab.com/tools/css-minifier): CSS compressor and minifier that strips comments, whitespace and redundant semicolons, shortens hex colors, and shows the exact bytes saved. Free.
- [HTML Minifier Online](https://devtoollab.com/tools/html-minifier): Minify HTML code by removing comments, whitespace, and unnecessary characters. Reduce HTML file size for faster page loading.
- [JavaScript Minifier Online](https://devtoollab.com/tools/javascript-minifier): Minify JavaScript code by removing comments, whitespace, console.log statements, and debug code. Optimize JS for production.
- [JSON Minifier Online](https://devtoollab.com/tools/json-minifier): Minify and compress JSON data by removing whitespace, comments, and unnecessary characters. Reduce JSON file size for APIs and production use.

### Networking
- [A Record Lookup Online](https://devtoollab.com/tools/a-record-lookup): Look up A DNS records for any domain and verify IPv4 address mapping with TTL values. Instantly check DNS A record propagation and IP assignments.
- [AAAA Record Lookup Online](https://devtoollab.com/tools/aaaa-record-lookup): Look up AAAA DNS records for any domain and verify IPv6 address mapping with TTL values - free, browser-based, no data stored.
- [BIMI Record Checker Online](https://devtoollab.com/tools/bimi-record-checker): Check BIMI DNS records and parse logo and authority directives to validate brand indicator setup for email clients - free to use.
- [Browser Error Codes](https://devtoollab.com/tools/browser-error-codes): Look up browser and HTTP error codes - ERR_SSL_VERSION_OR_CIPHER_MISMATCH, 502 Bad Gateway, ERR_NAME_NOT_RESOLVED, and more. See causes and step-by-step fixes.
- [Browser Info Checker](https://devtoollab.com/tools/browser-info-checker): See live browser details including user agent, platform, language, screen size, viewport, online status, and device capabilities.
- [CAA Record Checker Online](https://devtoollab.com/tools/caa-record-checker): Check a domain's CAA DNS records to see which certificate authorities can issue SSL certificates - free tool, no account required.
- [CIDR Overlap Checker](https://devtoollab.com/tools/cidr-overlap-checker): CIDR overlap checker that finds conflicting subnets in a list of IPv4 and IPv6 blocks. Spot VPC peering clashes and duplicate ranges before you deploy. Free.
- [CNAME Lookup Online](https://devtoollab.com/tools/cname-lookup): Check CNAME DNS alias records for subdomains and verify canonical host targets. Useful for debugging CDN, custom domains, and subdomain redirects.
- [Common Ports Lookup](https://devtoollab.com/tools/common-ports-lookup): Common ports lookup: search 96 well-known TCP and UDP ports by number or service name. Shows whether each port is safe to expose to the internet and why not. Works offline.
- [CORS Tester](https://devtoollab.com/tools/cors-tester): CORS tester checks whether a URL allows cross-origin requests from your browser, and explains exactly why a request was blocked when it fails. Free, no signup.
- [DKIM Record Checker Online](https://devtoollab.com/tools/dkim-record-checker): Check DKIM TXT records by selector and domain to verify email signing configuration and public key tags - no signup required.
- [DMARC Record Checker Online](https://devtoollab.com/tools/dmarc-checker): Check and parse the DMARC DNS TXT record for any domain to verify email authentication policy, alignment settings, and reporting addresses.
- [DNS Lookup Tool Online](https://devtoollab.com/tools/dns-lookup): Look up DNS records for any domain. Query A, AAAA, CNAME, MX, NS, TXT, and SOA records instantly using Google Public DNS. Essential for domain troubleshooting.
- [DNS Propagation Checker Online](https://devtoollab.com/tools/dns-propagation-checker): Check DNS propagation across global resolvers for A, AAAA, CNAME, MX, NS, and TXT records to confirm your DNS changes have spread.
- [DNSKEY Record Lookup Online](https://devtoollab.com/tools/dnskey-record-lookup): Query DNSKEY records for any domain and inspect DNSSEC public key metadata including flags, protocol, and algorithm - runs in your browser.
- [Email Header Analyzer](https://devtoollab.com/tools/email-header-analyzer): Parse raw email headers to trace routing path, verify SPF and DKIM authentication, detect delays, and debug email delivery issues.
- [gRPC Status Code Lookup](https://devtoollab.com/tools/grpc-status-code-lookup): gRPC status code lookup explains all 17 codes with HTTP mapping, retry guidance and language constants. Paste a code, a name or a log line. Free.
- [HTTP Header Parser](https://devtoollab.com/tools/http-header-parser): Parse raw HTTP request or response headers into a readable table, JSON structure, and quick audit view for security, caching, and CORS.
- [HTTP Response Headers Checker](https://devtoollab.com/tools/http-response-headers-checker): Inspect all HTTP response headers of any website. Audits security headers like HSTS, CSP, and X-Frame-Options and groups headers by type.
- [HTTP Status Checker](https://devtoollab.com/tools/http-status-checker): Free URL status and HTTP response checker. See the status code, response headers, every 301/302 redirect hop and the response time for any link. No signup.
- [HTTP Status Codes Reference](https://devtoollab.com/tools/http-status-codes-reference): Look up any HTTP status code and its meaning instantly, from 200 OK and 404 Not Found to 500 Server Error. Browse or search the list free, no signup required.
- [HTTP/2 Checker](https://devtoollab.com/tools/http2-checker): Test if any website supports HTTP/2 and HTTP/3 (QUIC) via real TLS ALPN negotiation. Shows TLS version, server headers, alt-svc advertisement, and response time.
- [Internet Speed Test Online](https://devtoollab.com/tools/internet-speed-test): Test your internet speed online. Measure download speed, upload speed, ping, and jitter instantly in your browser using Cloudflare's servers.
- [IP Address Lookup](https://devtoollab.com/tools/ip-address-lookup): Look up geolocation, ISP, timezone, and other information for any IP address. Find your public IP and trace IP locations instantly.
- [IP Blacklist Checker](https://devtoollab.com/tools/ip-blacklist-checker): Check if an IP address is listed on 15+ major DNSBL spam blacklists including Spamhaus, SpamCop, and Barracuda. Instantly audit email server reputation and identify deliverability issues.
- [IP Geolocation Lookup](https://devtoollab.com/tools/ip-geolocation): Instantly look up the geographic location, ISP, timezone, and network details for any IP address. Enter an IP or detect your own public IP with one click.
- [IP Range to CIDR Converter](https://devtoollab.com/tools/ip-range-to-cidr-converter): IP range to CIDR converter that turns a start and end address into the smallest exact set of CIDR blocks. Merges overlapping ranges, handles IPv4 and IPv6. Free, no signup.
- [IPv6 Address Expander](https://devtoollab.com/tools/ipv6-address-expander): IPv6 address expander converts shorthand IPv6 to the full 8-group form and compresses it back to RFC 5952 canonical notation. Keeps CIDR, zone IDs and embedded IPv4.
- [Localhost Port Tester](https://devtoollab.com/tools/localhost-tester): Look up what runs on any localhost port, open it in one click, and understand localhost vs 127.0.0.1. Covers 20+ dev ports including React, Vite, Ollama, Python, and databases.
- [MAC Address Lookup](https://devtoollab.com/tools/mac-address-lookup): Look up the manufacturer or vendor of any network device from its MAC address OUI prefix. Identifies device maker, unicast/multicast type, global/local scope, and randomised MAC detection for iOS and Android.
- [MTA-STS Record Checker Online](https://devtoollab.com/tools/mta-sts-record-checker): Validate MTA-STS TXT records for any domain and review policy ID metadata for SMTP transport security - browser-based, no install needed.
- [MTU and MSS Calculator](https://devtoollab.com/tools/mtu-mss-calculator): MTU and MSS calculator for WireGuard, IPsec, VXLAN, GRE and PPPoE: stack tunnel layers to get the inner MTU, TCP MSS and clamp commands. Free.
- [MX Record Lookup Online](https://devtoollab.com/tools/mx-record-lookup): Look up MX DNS records for any domain to see which mail servers handle incoming email and their priority - free, no signup needed.
- [NS Lookup Tool Online](https://devtoollab.com/tools/ns-lookup): Look up authoritative NS records for any domain and verify nameserver delegation with TTL details in one fast DNS query.
- [PCAP Viewer](https://devtoollab.com/tools/pcap-viewer): PCAP viewer that opens .pcap and .pcapng captures in your browser. Decodes TCP, UDP, DNS, HTTP and TLS, with Wireshark-style filters. Never uploaded. Free.
- [Ping Test Online](https://devtoollab.com/tools/ping-test): Test HTTP latency to a public website with repeated ping attempts, average response time, jitter, and request-failure tracking.
- [Port Checker](https://devtoollab.com/tools/port-checker): Check if a specific port is open or closed on any host or IP address. Test TCP connectivity for common service ports like HTTP, SSH, MySQL, and more.
- [PTR Lookup Online](https://devtoollab.com/tools/ptr-lookup): Perform a reverse DNS PTR lookup for any IPv4 or IPv6 address to find its mapped hostname. Useful for server audits, email deliverability, and IP reputation checks.
- [Rate Limit Header Analyzer](https://devtoollab.com/tools/rate-limit-header-analyzer): Analyze API rate limit headers instantly to see remaining quota, reset countdown, and usage percentage. Supports X-RateLimit, RateLimit, and Retry-After.
- [Redirect Chain Checker](https://devtoollab.com/tools/redirect-chain-checker): Trace the full redirect chain for any URL. See every HTTP hop, status code, and final destination to debug SEO, link shorteners, and site migrations.
- [Security Headers Checker Online](https://devtoollab.com/tools/security-headers-checker): Check which HTTP security headers are present on any website and get an instant A+ to F grade. Verifies Content-Security-Policy, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, COOP, and CORP.
- [SOA Record Lookup Online](https://devtoollab.com/tools/soa-record-lookup): Check SOA DNS records for any domain and inspect serial, refresh, retry, expire, and minimum TTL - instant results, no install required.
- [SPF Record Checker Online](https://devtoollab.com/tools/spf-record-checker): Validate SPF DNS records for any domain and review include chains, mechanisms, and all-policy qualifiers to debug deliverability issues.
- [SRV Record Lookup Online](https://devtoollab.com/tools/srv-record-lookup): Look up SRV DNS records and inspect priority, weight, port, and target host values for service routing validation - no signup needed.
- [SSL Certificate Checker Online](https://devtoollab.com/tools/ssl-certificate-checker): Check SSL certificate details for any domain - expiry date, issuer, Subject Alternative Names, TLS version, and fingerprint. Instantly verify if a certificate is valid, trusted, and how many days remain before it expires.
- [Subnet Calculator](https://devtoollab.com/tools/subnet-calculator): Subnet calculator computes IPv4 network masks, broadcast addresses, and host ranges from any IP and CIDR prefix - fast, free, and works entirely in your browser.
- [TCP Throughput Calculator](https://devtoollab.com/tools/tcp-throughput-calculator): TCP throughput calculator: enter bandwidth, RTT and window size to get the bandwidth-delay product, max throughput, loss limit and Linux sysctl tuning. Free.
- [TLS-RPT Record Checker Online](https://devtoollab.com/tools/tls-rpt-record-checker): Check TLS-RPT DNS records and inspect report destination URIs to monitor SMTP TLS delivery failures - free tool, no signup required.
- [TXT Record Lookup Online](https://devtoollab.com/tools/txt-record-lookup): Look up TXT DNS records for SPF, domain verification, and email authentication tokens with instant results and clean JSON output.
- [URL Redirect Checker Online](https://devtoollab.com/tools/url-redirect-checker): Check URL redirect chains, final destination URL, and HTTP status codes for any link to debug SEO migrations and shortened URLs.
- [URL Tracker & Link Shortener](https://devtoollab.com/tools/url-tracker): Create short, trackable URLs with detailed click analytics. Track visitor location, devices, referrers, and more. Password protection & QR codes included.
- [URL Unshortener](https://devtoollab.com/tools/url-unshortener): Expand shortened URLs from bit.ly, t.co, tinyurl, and others to reveal the final destination and full redirect chain - free tool.
- [VLSM Calculator](https://devtoollab.com/tools/vlsm-calculator): VLSM calculator that splits one network into right-sized subnets from your host counts. Shows CIDR, mask, host ranges, broadcast and wasted IPs. Free.
- [Webhook Receiver & Inspector](https://devtoollab.com/tools/webhook-receiver): Generate a unique URL to easily test, receive and inspect HTTP webhooks in real-time. View request headers, query parameters, JSON payloads, and more.
- [Website Down Checker](https://devtoollab.com/tools/website-down-checker): Check if a website is down for everyone or just you. Test website availability, status code, DNS resolution, and response time from an independent server.
- [Website Technology Detector](https://devtoollab.com/tools/website-technology-detector): Detect the technology stack behind any website - CMS, JavaScript frameworks, analytics, CDN, hosting, and 80+ more technologies fingerprinted from HTTP headers and HTML source.
- [WebSocket Tester](https://devtoollab.com/tools/websocket-tester): WebSocket tester connects to any ws:// or wss:// endpoint, sends messages, and logs responses in real time. Free, browser-based WebSocket client for debugging APIs.
- [WHOIS Lookup Online](https://devtoollab.com/tools/whois-lookup): Look up domain registration details including registrar, creation date, expiry date, nameservers, and status flags for any public domain.
- [Wildcard Mask Calculator](https://devtoollab.com/tools/wildcard-mask-calculator): Wildcard mask calculator that converts between CIDR, subnet mask and Cisco ACL wildcard bits, and flags non-contiguous masks. Free, no signup.

### Optimizers
- [Image Compressor Online](https://devtoollab.com/tools/image-compressor): Compress images online while maintaining quality. Supports HEIC, JPEG, PNG, WebP, BMP, GIF, TIFF formats. Features aspect ratio maintenance, custom dimensions, quality presets, batch processing with ZIP download. Reduce file sizes for faster web loading.
- [PDF Compress Online](https://devtoollab.com/tools/pdf-compress): Compress PDF files online to reduce file size for email and uploads. Adjust quality and scale settings, then download a smaller PDF copy.
- [SVG Optimizer Online](https://devtoollab.com/tools/svg-optimizer): Optimize SVG markup by removing comments, metadata, extra whitespace, and unnecessary decimal precision. Reduce file size before shipping icons, logos, and illustrations.
- [WAV Compressor](https://devtoollab.com/tools/wav-compressor): Compress WAV audio files in your browser by lowering sample rate, bit depth, and channels. Reduce WAV file size while keeping playable PCM output, with instant preview and batch ZIP download. Free and private.

### Security
- [HSTS Header Generator](https://devtoollab.com/tools/hsts-generator): Generate Strict-Transport-Security (HSTS) headers with includeSubDomains and preload directives. Enforce HTTPS for your domain easily.
- [security.txt Generator](https://devtoollab.com/tools/security-txt-generator): Generate a security.txt file for vulnerability disclosure following RFC 9116. Add contact, encryption, and policy fields, then download it for your .well-known folder.

### SEO
- [Ads.txt Generator Online](https://devtoollab.com/tools/ads-txt-generator): Generate ads.txt files for publishers with DIRECT or RESELLER seller lines, optional owner and manager directives, and instant copy or download.
- [AI Crawler Blocker](https://devtoollab.com/tools/ai-crawler-blocker): Block GPTBot, ClaudeBot, CCBot, and other AI crawlers from scraping your website with a ready-to-use robots.txt generator. Free, browser-based, no signup needed.
- [Anchor Text Generator](https://devtoollab.com/tools/anchor-text-generator): Anchor text generator that creates exact-match, partial-match, branded, generic, and naked URL variants for any URL and keyword. Free, no signup.
- [Canonical Tag Generator](https://devtoollab.com/tools/canonical-tag-generator): Generate canonical link tags for preferred URLs and avoid duplicate content indexing issues across parameter and variant pages.
- [DMARC Record Generator](https://devtoollab.com/tools/dmarc-record-generator): Create DMARC TXT records with rua/ruf reports, alignment modes, pct rollout, and reject or quarantine policies - free, browser-based.
- [Domain Age Checker Online](https://devtoollab.com/tools/domain-age-checker): Check a domain's registration date, estimated age, registrar, expiration timeline, and nameserver details with a quick RDAP lookup.
- [FAQ Schema Generator](https://devtoollab.com/tools/faq-schema-generator): Generate FAQPage JSON-LD schema markup from your questions and answers to improve structured data coverage and rich result eligibility.
- [Favicon Checker Online](https://devtoollab.com/tools/favicon-checker): Scan a website for favicon, apple-touch-icon, and manifest icon coverage. Validate icon URLs, status codes, and recommended sizes.
- [Hreflang Tag Generator](https://devtoollab.com/tools/hreflang-tag-generator): Create hreflang and x-default link tags for multilingual websites so search engines serve the correct language and region page.
- [Htaccess Redirect Generator](https://devtoollab.com/tools/htaccess-redirect-generator): htaccess redirect generator creates rewrite rules for 301 redirects, HTTPS enforcement, and WWW canonicalization. Copy ready-to-use Apache config instantly.
- [JSON-LD Validator](https://devtoollab.com/tools/json-ld-validator): JSON-LD validator that checks schema markup for syntax errors, missing required properties, and invalid dates or prices. Paste JSON-LD or a full page, no signup.
- [Keyword Density Checker Online](https://devtoollab.com/tools/keyword-density-checker): Analyze keyword frequency and density percentages in your content. Filter by minimum word length, exclude stop words, and identify top repeated terms for better on-page SEO.
- [LLMs.txt Generator Online](https://devtoollab.com/tools/llms-txt-generator): Generate Markdown-based llms.txt files with a site summary, guidance notes, and curated links for AI assistants and search agents.
- [Meta Tag Generator](https://devtoollab.com/tools/meta-tag-generator): Meta tag generator creates SEO-friendly tags, Open Graph, and Twitter Cards in seconds. Improve search rankings and social sharing with no coding required.
- [Meta Tags Checker](https://devtoollab.com/tools/meta-tags-checker): Analyze HTML meta tags such as title, description, canonical, Open Graph, and Twitter Card tags with actionable SEO checks.
- [OG Image Generator](https://devtoollab.com/tools/og-image-generator): Create Open Graph social share images sized 1200x630 with custom titles, colors, and gradients directly in your browser. Download PNG instantly, no signup needed.
- [Open Graph Checker](https://devtoollab.com/tools/open-graph-checker): Fetch and inspect the Open Graph and Twitter Card meta tags for any URL. Preview how your page looks when shared on Facebook, LinkedIn, Twitter, and Slack - with OG score and missing tag detection.
- [Open Graph Generator](https://devtoollab.com/tools/open-graph-generator): Open Graph tag generator builds OG meta tags for Facebook and LinkedIn with a live link preview. See exactly how your page looks when shared before publishing.
- [Open Graph Preview Checker Online](https://devtoollab.com/tools/open-graph-preview-checker): Paste HTML to extract Open Graph and Twitter Card metadata, preview social sharing cards, and copy clean meta tags instantly.
- [Robots.txt Generator](https://devtoollab.com/tools/robots-txt-generator): Create robots.txt files to control how search engine bots crawl your website. Allow or disallow specific agents and paths.
- [Robots.txt Tester](https://devtoollab.com/tools/robots-txt-tester): Test robots.txt rules to verify whether a specific URL path is allowed or blocked for Googlebot, Bingbot, or any custom user-agent.
- [Schema Markup Generator Online](https://devtoollab.com/tools/schema-markup-generator): Generate JSON-LD schema markup for organizations, local businesses, articles, and products with implementation-ready structured data.
- [SERP Snippet Preview Tool](https://devtoollab.com/tools/serp-snippet-preview): Preview how your page title, URL, and meta description can appear on Google search results. Track title and description length instantly.
- [Sitemap Diff Checker](https://devtoollab.com/tools/sitemap-diff-checker): Sitemap diff checker compares two XML sitemaps and lists every URL added, removed or changed, with lastmod deltas. Paste or upload both. Free.
- [Sitemap Generator Online](https://devtoollab.com/tools/sitemap-generator): Generate comprehensive XML sitemaps for any website. Enter your URLs and create a Google-compatible sitemap.xml with priority, change frequency, and lastmod settings. Free, no signup.
- [SPF Record Generator](https://devtoollab.com/tools/spf-record-generator): Generate SPF TXT records with ip4, ip6, A, MX, and include mechanisms. Choose hard or soft fail policy - no signup required.
- [Title Tag Analyzer](https://devtoollab.com/tools/title-tag-analyzer): Title tag analyzer that measures SERP pixel width, flags truncation past 580px and scores length and keyword placement. Paste many titles. Free.
- [X/Twitter Card Generator](https://devtoollab.com/tools/twitter-card-generator): Twitter Card generator creates meta tags for Summary and Large Image cards with real-time preview. Optimize how your links appear on X - free and no signup.
- [XML Sitemap Validator](https://devtoollab.com/tools/sitemap-validator): Fetch and validate any XML sitemap - checks URL count, lastmod date format, changefreq values, priority range, and detects duplicate URLs. Supports sitemap index files.

### Social Media
- [Hashtag Generator](https://devtoollab.com/tools/hashtag-generator): Generate trending hashtags for Instagram, TikTok, Twitter/X, LinkedIn, and YouTube. Enter a keyword and get optimized hashtags for maximum reach and engagement.
- [Mailto Link Generator](https://devtoollab.com/tools/mailto-link-generator): Create mailto links with pre-filled recipients, subject, and body. Generate HTML email links for contact buttons and support pages.
- [PayPal Link Generator](https://devtoollab.com/tools/paypal-link-generator): Generate a PayPal payment link or button in seconds: PayPal.me, Donate, Buy Now or Subscribe. Set the amount and currency, then copy the URL or HTML. Free.
- [Social Share Link Generator](https://devtoollab.com/tools/social-share-link-generator): Generate share links for all major social media platforms. Create ready-to-use URLs for Facebook, Twitter, LinkedIn, WhatsApp, and more.
- [Twitter/X Intent URL Generator](https://devtoollab.com/tools/twitter-intent-generator): Generate Twitter Web Intent URLs for pre-filled tweets, retweets, likes, follows, and direct messages. Perfect for share buttons and CTAs.
- [UTM Link Builder](https://devtoollab.com/tools/utm-link-builder): Create UTM-tagged URLs for tracking marketing campaigns in Google Analytics. Build links with source, medium, campaign, term, and content parameters.
- [WhatsApp Link Generator](https://devtoollab.com/tools/whatsapp-link-generator): Create click-to-chat WhatsApp links. Generate wa.me links, API links, and group invite links for websites and marketing campaigns.
- [YouTube Timestamp Link Generator](https://devtoollab.com/tools/youtube-timestamp-link-generator): Generate YouTube timestamp links that start at any time. Create shareable URLs and embed codes for videos instantly - free, no login required.

### Utilities
- [ASCII Table & Chart Online](https://devtoollab.com/tools/ascii-table): Complete ASCII table with all 128 characters. View decimal, hex, octal, and binary values. Search, filter by category, copy characters, and export as CSV.
- [AWS ARN Parser](https://devtoollab.com/tools/aws-arn-parser): Parse any AWS ARN into partition, service, region, account ID, and resource, or build a valid ARN from scratch. Free, browser-based, no signup required.
- [Breathing Exercise](https://devtoollab.com/tools/breathing-exercise): Guided breathing exercises with animated visual cues. Practice Box Breathing, 4-7-8, Wim Hof, Deep Breathing, and Resonant Breathing with audio phase cues and session tracking.
- [Character Counter Online](https://devtoollab.com/tools/character-counter): Count characters, words, sentences, and paragraphs in real time. Check text against platform limits for Twitter, Instagram, YouTube, SEO meta tags, SMS, and Google Ads.
- [Chmod Calculator](https://devtoollab.com/tools/chmod-calculator): chmod calculator converts Linux file permissions between octal (755) and symbolic (rwxr-xr-x) formats visually. Free, browser-based, and no login needed.
- [Click Speed Test Online](https://devtoollab.com/tools/click-speed-test): Test how fast you can click with this free CPS (Clicks Per Second) test. Choose from 5s, 10s, 30s, or 60s durations and track your personal best click speed score.
- [Color Mixer Online](https://devtoollab.com/tools/color-mixer): Mix any two colors by blending them at a custom ratio and get the resulting HEX, RGB, and HSL values instantly. Perfect for creating color palettes, gradient stops, and accessible UI mid-tones.
- [Color Name Lookup](https://devtoollab.com/tools/color-name-lookup): Find the exact name of any color from its HEX or RGB value. Get color name, closest named color, HSL, HSV, and CMYK values instantly.
- [Color Picker from Screen](https://devtoollab.com/tools/screen-color-picker): Color picker from screen: click once to sample any pixel on your display, even outside the browser. Copy HEX, RGB or HSL and export a CSS palette. Free.
- [Color to Tailwind CSS](https://devtoollab.com/tools/color-to-tailwind): Find the nearest Tailwind CSS color class for any hex, rgb(), or hsl() color. Matches against the full Tailwind v3 palette and shows the top 12 closest colors with swatches and class names.
- [Connection String Parser & Builder](https://devtoollab.com/tools/connection-string-parser): Parse and build database connection strings for PostgreSQL, MySQL, MongoDB, and Redis instantly in your browser. Extract host, port, credentials, and query params. Free, no signup.
- [Countdown Timer Online](https://devtoollab.com/tools/countdown-timer): Create countdown timers to any date or event. Track time remaining in days, hours, minutes, and seconds. Perfect for deadlines, events, and holidays.
- [Country Code Lookup Online](https://devtoollab.com/tools/country-code-lookup): Resolve ISO country codes to retrieve metadata including region, income level, and capital city in one lookup - runs entirely in your browser.
- [Country Info Lookup](https://devtoollab.com/tools/country-info-lookup): Look up detailed information for any country worldwide - capital, population, area, currencies, languages, timezones, flag, and ISO codes instantly.
- [Country Information Lookup](https://devtoollab.com/tools/country-lookup): Look up detailed information about any country - capital, population, area, languages, currencies, timezones, and flag. Powered by the REST Countries API.
- [Cron Expression Parser Online](https://devtoollab.com/tools/cron-expression-parser): Parse cron expressions into plain English descriptions, field breakdowns, and validation feedback without making any server request.
- [Crypto Price Checker](https://devtoollab.com/tools/crypto-price-checker): Check live cryptocurrency prices for the top 500 coins by market cap. Displays real-time price, 24h change, market cap, and trading volume via the free CoinGecko API. Export data as JSON for developer workflows.
- [CSS Cubic Bezier Generator](https://devtoollab.com/tools/css-cubic-bezier-generator): Visually generate CSS cubic-bezier() easing functions for animations. Adjust control points with sliders, pick from presets like ease, bounce, and elastic, preview the animation live, and copy the CSS value.
- [CSV Column Extractor](https://devtoollab.com/tools/csv-column-extractor): Extract, reorder, and filter CSV columns online. Upload files up to 200 MB or paste CSV directly. Select which columns to keep, reorder them, and download the result. Free, browser-based.
- [cURL to Code Converter](https://devtoollab.com/tools/curl-to-code): Convert curl commands to JavaScript fetch, Axios, or Python requests code instantly. Paste your curl command and get clean, ready-to-run code.
- [Dice Roller Online](https://devtoollab.com/tools/dice-roller): Roll virtual dice online for free. Choose from d4, d6, d8, d10, d12, and d20 dice. Roll multiple dice at once with animated results and roll history.
- [Diff Checker Online](https://devtoollab.com/tools/diff-checker): Compare two texts and find differences with side-by-side and unified views. Highlight changes at word or character level with clean, intuitive interface.
- [Email Extractor Online](https://devtoollab.com/tools/email-extractor): Extract all valid email addresses from text, HTML, CSV, or documents. Remove duplicates and download results as TXT or CSV - free.
- [Emoji Picker & Search](https://devtoollab.com/tools/emoji-picker): Search, browse, and copy emojis instantly. Browse by category, search by name, view recently used, and copy to clipboard with one click.
- [Env File Diff Checker](https://devtoollab.com/tools/env-file-diff-checker): Compare two .env files and see added, removed, and changed variables instantly. Understands comments, quotes, and export prefixes. Free, private tool.
- [Find and Replace Text Online](https://devtoollab.com/tools/find-and-replace): Find and replace text with support for regex, case-sensitive matching, whole word search, and multi-line replacement. Preview changes before applying.
- [Flip a Coin Online](https://devtoollab.com/tools/coin-flip): Flip a virtual coin online with true 50/50 probability. Track flip history, see heads vs tails statistics, and make quick random decisions. Free coin toss simulator.
- [Git Conflict Resolver](https://devtoollab.com/tools/git-conflict-resolver): Git conflict resolver for files with <<<<<<< markers: pick ours, theirs, both or base for each conflict and copy the clean file. Handles diff3 and zdiff3.
- [Google Fonts Previewer](https://devtoollab.com/tools/google-fonts-previewer): Preview 100+ Google Fonts live in your browser. Adjust size, weight, style, and letter spacing, then copy the ready-to-use HTML link tag and CSS code.
- [HTML Special Characters & Entities Online](https://devtoollab.com/tools/html-special-characters): Browse and copy all HTML entities - symbols, punctuation, math, arrows, and currency - as entity name, decimal code, or hex code.
- [ISBN Lookup Online](https://devtoollab.com/tools/isbn-lookup): Check ISBN-10 and ISBN-13 codes to fetch book metadata including title, publisher, publication date, and page count - free, no signup.
- [JavaScript Obfuscator Online](https://devtoollab.com/tools/javascript-obfuscator): Obfuscate JavaScript code to make it harder to read and reverse-engineer. Remove comments, encode strings to unicode escapes, compact whitespace, and optionally wrap with eval/base64 encoding.
- [JavaScript Playground](https://devtoollab.com/tools/javascript-playground): JavaScript playground runs your JS code instantly in a sandboxed browser tab with live console output, top-level await, timing and error traces. Free, no signup, nothing uploaded.
- [JMESPath Tester](https://devtoollab.com/tools/jmespath-tester): JMESPath tester that evaluates expressions against your JSON as you type. Test AWS CLI and Azure CLI --query filters, projections and functions. Free.
- [jq Playground](https://devtoollab.com/tools/jq-playground): jq playground that runs jq filters against your JSON in the browser. Test select, map, group_by and @csv with -r, -c and -s flags, matching jq 1.7.1. Free.
- [JSON Merge](https://devtoollab.com/tools/json-merge): JSON merge combines two JSON objects with deep merging and configurable conflict handling for arrays and duplicate keys. Free, browser-based, no signup.
- [JSONPath Tester](https://devtoollab.com/tools/jsonpath-tester): JSONPath tester evaluates expressions against your JSON and lists every matched node with its exact path. Filters, wildcards, slices. Free.
- [Keyboard Tester Online](https://devtoollab.com/tools/keyboard-tester): Test every key on your keyboard and see key name, key code, scan code, and modifier states instantly. Diagnose keyboard issues and find JavaScript key codes for development.
- [KeyCode Finder](https://devtoollab.com/tools/keycode-finder): JavaScript keycode finder: press any key to see event.key, event.code and the deprecated keyCode, plus modifier states and a ready-to-paste snippet. Free, runs in your browser.
- [List Randomizer Online](https://devtoollab.com/tools/list-randomizer): Shuffle, sort, reverse, or pick random items from any list. Paste items one per line and instantly randomize, sort A-Z, sort by length, or select N random winners.
- [Love Calculator](https://devtoollab.com/tools/love-calculator): Find your love compatibility percentage! Enter two names and get instant love score, compatibility breakdown across 8 traits, and fun results to share. Perfect for Valentine's Day.
- [Lua Deobfuscator Helper](https://devtoollab.com/tools/lua-deobfuscator-helper): Lua deobfuscator that makes obfuscated Lua readable in your browser: reindents code, decodes string.char calls and unescapes strings. Free, not a decompiler.
- [Lua Obfuscator](https://devtoollab.com/tools/lua-obfuscator): Lua obfuscator online: obfuscate Lua code for free by renaming locals, stripping comments, minifying whitespace and encoding strings. Runs in your browser.
- [Microphone Test Online](https://devtoollab.com/tools/microphone-test): Test your microphone online for free. See a real-time audio waveform, measure volume levels, and check your mic's sample rate and settings.
- [npm Yarn pnpm Converter](https://devtoollab.com/tools/npm-yarn-pnpm-converter): npm to yarn pnpm command converter translates install, add, remove, and run commands between npm, Yarn, pnpm, and Bun instantly. Free, browser-based.
- [Number Formatter Online](https://devtoollab.com/tools/number-formatter): Format any number instantly with thousand separators, currency symbols, scientific notation, engineering notation, Indian numbering system, and data size conversion. Copy any format with one click.
- [Online Guitar Tuner](https://devtoollab.com/tools/guitar-tuner): Free online guitar tuner that uses your microphone to detect pitch in real time. Shows note, cents deviation, and tuning needle. Works for guitar, bass, ukulele, and violin.
- [Online Metronome](https://devtoollab.com/tools/metronome): Free online metronome for musicians. Set tempo from 20 to 240 BPM, choose time signature (2/4, 3/4, 4/4, 6/8), and practice with click, wood block, or beep sounds. Includes tap tempo.
- [Online Notepad](https://devtoollab.com/tools/online-notepad): Free online notepad with auto-save, customizable fonts, find & replace, word count, and file upload/download. No registration required - works entirely in your browser.
- [Online Stopwatch](https://devtoollab.com/tools/online-stopwatch): Free online stopwatch with lap tracking, split times, and millisecond precision. Start, stop, reset, and record laps instantly in your browser.
- [Pastebin Online](https://devtoollab.com/tools/pastebin): Share code snippets, logs, and text with a shareable link. Syntax highlighting for 30+ languages, expiration controls, and password protection for Pro users.
- [PDF Merge Online](https://devtoollab.com/tools/pdf-merge): Merge multiple PDF files into one document online for free. Drag to reorder, preview page counts, and download the combined PDF. 100% browser-based, no upload needed.
- [PDF Metadata Viewer](https://devtoollab.com/tools/pdf-metadata-viewer): PDF metadata viewer shows page count, title, author, creation and modified dates straight from the file, all inside your browser. Free, no signup, no upload.
- [PDF Password Adder Online](https://devtoollab.com/tools/pdf-password-adder): Add password protection to PDF files online. Secure your documents with user and owner passwords and download the protected PDF instantly.
- [PDF Password Remover Online](https://devtoollab.com/tools/pdf-password-remover): Remove password protection from PDF files online. Enter the existing password and download an unlocked PDF copy instantly in your browser.
- [PDF Rotator](https://devtoollab.com/tools/pdf-rotator): PDF rotator lets you rotate PDF pages 90, 180, or 270 degrees online, all pages or just the ones you pick, then download the fixed file. Free, private, no upload.
- [PDF Splitter Online](https://devtoollab.com/tools/pdf-splitter): Split PDF files online into separate documents or custom page ranges. Extract every page or chunk a large PDF every N pages directly in your browser.
- [Pomodoro Timer Online](https://devtoollab.com/tools/pomodoro-timer): Boost your productivity with the Pomodoro Technique. Customizable work and break intervals, session tracking, audio notifications, and focus statistics.
- [Postal Code Lookup Online](https://devtoollab.com/tools/postal-code-lookup): Look up ZIP and postal code metadata by country to retrieve matching city and state location details instantly - no data sent to any server.
- [Public API Finder](https://devtoollab.com/tools/public-api-finder): Search and discover 1,400+ free public APIs across 50+ categories. Filter by authentication type, CORS support, and HTTPS to find the perfect API for your next project.
- [Public Holidays Lookup](https://devtoollab.com/tools/public-holidays-lookup): Look up public and national holidays for any country and year. Covers 100+ countries with dates, holiday names, and types.
- [QR Code Reader Online](https://devtoollab.com/tools/qr-code-reader): Scan and decode QR codes from images or camera. Upload a QR code image or use your webcam to read QR codes instantly. Free online QR code scanner.
- [Random List Picker Online](https://devtoollab.com/tools/random-list-picker): Pick a random item from any list instantly. Paste names, options, or items and let the tool randomly select one or multiple entries. Perfect for giveaways, decisions, and classroom picks.
- [Schedule Builder](https://devtoollab.com/tools/schedule-builder): Build weekly schedules with sessions, times, locations, and notes. Preview the plan instantly and export it as Markdown or JSON.
- [Screen Resolution Checker](https://devtoollab.com/tools/screen-resolution-checker): Check your screen resolution, viewport size, device pixel ratio, color depth, and device type instantly in your browser.
- [SemVer Calculator](https://devtoollab.com/tools/semver-calculator): Bump semantic versions (major/minor/patch/pre-release), compare two versions, and validate whether a version satisfies an npm-style range like ^1.2.3 or >=2.0.0 <3.0.0.
- [SemVer Range Tester](https://devtoollab.com/tools/semver-range-tester): Test semantic version ranges against a list of versions. Supports npm semver syntax including ^, ~, >=, <, ||, and exact versions. Free, browser-based, no install needed.
- [Social Media Character Counter](https://devtoollab.com/tools/social-media-character-counter): Real-time character counter for Twitter/X, Instagram, LinkedIn, TikTok, Threads, Pinterest, and YouTube with platform-specific limits.
- [Spin the Wheel Online](https://devtoollab.com/tools/spin-the-wheel): Spin a customizable random wheel to make decisions, pick winners, or choose what to eat. Add up to 20 options with animated spinner. Fair and random every time.
- [SVG Wave Generator](https://devtoollab.com/tools/svg-wave-generator): Generate smooth SVG wave shapes for website section dividers and backgrounds. Control amplitude, frequency, colors, and wave style, then download the SVG or copy the code.
- [Text Line Sorter](https://devtoollab.com/tools/text-line-sorter): Text line sorter - sort alphabetically, numerically, or by length, reverse order, and remove duplicates. Free, no signup required.
- [Timezone Finder](https://devtoollab.com/tools/timezone-finder): Find the IANA timezone, current local time, and UTC offset for any city worldwide - live clock updates every second, no install needed.
- [Typing Speed Test Online](https://devtoollab.com/tools/typing-speed-test): Test your typing speed and accuracy with this free online typing test. Measure Words Per Minute (WPM), Characters Per Minute (CPM), and accuracy with real-time feedback.
- [Unicode Normalizer](https://devtoollab.com/tools/unicode-normalizer): Unicode normalizer converts text between NFC, NFD, NFKC, and NFKD forms and shows codepoint, UTF-16, and UTF-8 counts, so lookalike strings stop breaking equality checks.
- [URL Extractor](https://devtoollab.com/tools/url-extractor): URL extractor pulls every link out of text, HTML, or log files, removes duplicates, and counts domains. Free, browser-based, exports to CSV or markdown.
- [Vim Commands Lookup](https://devtoollab.com/tools/vim-commands-lookup): Vim commands lookup: search real commands by task - exit vim, delete a line, search and replace across a file. Grouped by mode with practical notes. Works offline, free.
- [Weather Lookup](https://devtoollab.com/tools/weather-lookup): Look up real-time weather conditions for any city worldwide. Get current temperature, humidity, wind speed, UV index, and sky conditions using the free Open-Meteo API. No API key required.
- [Webcam Photo Taker - Take a Picture Online](https://devtoollab.com/tools/webcam-to-photo): Take a picture with your webcam in the browser. Countdown timer for self-portraits, instant PNG download. Nothing is uploaded, 100% private.
- [Webcam Test Online](https://devtoollab.com/tools/webcam-test): Test your webcam online for free. See a live camera preview, check your webcam's resolution, frame rate, and facing mode. Works with built-in and USB webcams.
- [Word Definition Lookup](https://devtoollab.com/tools/word-definition): Look up definitions, pronunciations, synonyms, antonyms, and usage examples for any English word. Powered by the Free Dictionary API with audio pronunciation support.
- [World Clock Online](https://devtoollab.com/tools/world-clock): Track time across multiple cities and timezones simultaneously. Features real-time updates, DST support, day/night indicators, and time comparison table.
- [YouTube Thumbnail Downloader - Free HD Download](https://devtoollab.com/tools/youtube-thumbnail-downloader): Download any YouTube thumbnail in HD up to 1280x720, Shorts included. Paste a watch link, youtu.be link or video ID. Free, no signup, no watermark.
- [ZIP File Creator](https://devtoollab.com/tools/zip-file-creator): ZIP file creator builds a compressed .zip archive from your files or a whole folder, with four compression levels and real size stats. Free, no upload and no signup.

### Validators
- [API Key Validator](https://devtoollab.com/tools/api-key-validator): Test and validate API keys for OpenAI, Anthropic, Google AI, and other services. Secure validation without storing keys on our servers.
- [AWS Cron Expression Validator](https://devtoollab.com/tools/aws-cron-expression-validator): AWS cron expression validator for EventBridge rules and Scheduler. Explains each field and lists next run times in UTC or any time zone, with DST skips shown.
- [Certificate Key Matcher](https://devtoollab.com/tools/certificate-key-matcher): Certificate key matcher that checks whether an SSL certificate or CSR matches its private key. RSA, EC and Ed25519 PEM keys, compared in your browser. Free.
- [CODEOWNERS Tester](https://devtoollab.com/tools/codeowners-tester): CODEOWNERS tester shows which GitHub code owner reviews each file path and which line decided. Flags invalid owners and unsupported syntax. Free, offline.
- [Color Contrast Checker](https://devtoollab.com/tools/color-contrast-checker): Check color contrast ratios for WCAG 2.1 accessibility compliance. Validate AA and AAA requirements for text and UI components.
- [Credit Card Validator](https://devtoollab.com/tools/credit-card-validator): Validate credit card numbers using the Luhn algorithm. Detect card types including Visa, Mastercard, American Express, Discover, and more.
- [Crontab Tester](https://devtoollab.com/tools/crontab-tester): Crontab tester that checks whether a cron expression fires at a given date and time, and shows which field blocked it when it does not. Free.
- [CSS Selector Tester](https://devtoollab.com/tools/css-selector-tester): CSS selector tester matches your selector against pasted HTML and highlights every element it selects instantly. Debug selectors before shipping. Free, browser-based, no signup.
- [CSV Validator](https://devtoollab.com/tools/csv-validator): CSV validator that checks delimiter consistency, ragged rows, duplicate headers, and encoding issues before you import the file. Paste or upload, free.
- [DNS Zone File Validator](https://devtoollab.com/tools/dns-zone-file-validator): DNS zone file validator that checks BIND records for syntax errors, bad TTLs, missing SOA fields and unterminated names. Runs offline. Free.
- [Docker Compose Validator](https://devtoollab.com/tools/docker-compose-validator): Docker Compose validator that checks compose.yaml against the Compose spec and finds port clashes, undeclared volumes and depends_on cycles. Free.
- [Dockerfile Linter](https://devtoollab.com/tools/dockerfile-linter): Dockerfile linter checks your Dockerfile for best-practice violations and security issues with line-level findings, a score out of 10, and fix hints. Free, browser-based.
- [Dotenv Linter](https://devtoollab.com/tools/dotenv-linter): Validate your .env file for naming convention errors, duplicate keys, invalid values, and formatting issues. Get line-by-line feedback instantly. Free, browser-based.
- [Email Validator Online](https://devtoollab.com/tools/email-validator): Validate email addresses instantly with format checking, domain verification, and common typo detection. Check single or bulk emails for deliverability.
- [GitHub Actions Validator](https://devtoollab.com/tools/github-actions-validator): GitHub Actions validator that checks workflow YAML for schema errors, retired runners, outdated actions and script injection before you push. Free.
- [Gitignore Tester](https://devtoollab.com/tools/gitignore-tester): Test file paths against your .gitignore rules and see exactly which pattern matched, on which line, and whether a negation won. Free, runs offline.
- [HTML Accessibility Checker](https://devtoollab.com/tools/html-accessibility-checker): HTML accessibility checker that scans pasted markup for WCAG 2.2 failures: missing alt text, unlabeled form fields, skipped headings, and broken ARIA. Free, no signup.
- [IBAN Validator Online](https://devtoollab.com/tools/iban-validator): Validate IBAN numbers instantly with country-specific length checks, formatting, and MOD-97 checksum verification for international bank accounts.
- [JavaScript Validator](https://devtoollab.com/tools/javascript-validator): Validate JavaScript syntax instantly in your browser with a real parser. Catch syntax errors with exact line and column numbers, check module or script code, and see statement stats. Free, no signup.
- [JSON Schema Validator Online](https://devtoollab.com/tools/json-schema-validator): Validate JSON documents against JSON Schema to catch missing fields, type errors, and invalid values - free, no install needed.
- [JSON Validator Online](https://devtoollab.com/tools/json-validator): Validate JSON data instantly with detailed error messages, line numbers, and auto-fix suggestions. Lint, format, and check JSON syntax online for free.
- [JWT Signature Verifier](https://devtoollab.com/tools/jwt-signature-verifier): Verify JWT signatures online using a secret or public key for HS256, HS384, HS512, and RS256 tokens. Instantly confirm validity and expiry. Free, client-side tool.
- [Kubernetes Manifest Linter](https://devtoollab.com/tools/kubernetes-manifest-linter): Kubernetes manifest linter checks your K8s YAML for missing resource limits, latest image tags, missing probes, and root containers. Free, instant, client-side.
- [Lua Syntax Validator](https://devtoollab.com/tools/lua-syntax-validator): Check Lua syntax instantly in your browser. Detect unbalanced blocks, unmatched brackets, and unterminated strings or comments with line numbers. Free heuristic Lua syntax validator, no signup required.
- [NACHA File Parser](https://devtoollab.com/tools/nacha-file-parser): NACHA file parser and ACH file validator. Checks routing check digits, entry hash, batch totals and 94-character records, then exports entries to CSV. Free.
- [Nginx Location Tester](https://devtoollab.com/tools/nginx-location-tester): Nginx location tester matches any request URI against your location blocks and shows which one nginx picks, and why, using real precedence rules.
- [Password Leak Checker Online](https://devtoollab.com/tools/password-leak-checker): Check if a password appears in known breach data using a privacy-preserving hash prefix lookup. Your plaintext password is never sent to the server.
- [Password Strength Checker](https://devtoollab.com/tools/password-strength-checker): Analyze password strength and security in real-time. Get detailed feedback on complexity, entropy, estimated crack time, and suggestions for improvement.
- [Regex Tester & Validator](https://devtoollab.com/tools/regex-tester): Test regular expressions with real-time validation, match highlighting, and detailed explanations. Debug regex patterns quickly and efficiently.
- [SHA256 File Checksum Online](https://devtoollab.com/tools/sha256-file-checksum): Generate SHA-256 checksums for files in your browser to verify downloads, releases, and file integrity without uploading data.
- [Webhook Signature Verifier](https://devtoollab.com/tools/webhook-signature-verifier): Verify webhook signatures from Stripe, GitHub, Shopify, or any HMAC provider by recomputing the hash from your payload and secret, fully in your browser.
- [XML Validator Online](https://devtoollab.com/tools/xml-validator): Validate XML documents for well-formedness and syntax errors. Get instant feedback with line numbers, error details, and document statistics. Free online XML checker.
- [XPath Tester & Evaluator Online](https://devtoollab.com/tools/xpath-tester): Test and evaluate XPath expressions against XML documents. Get instant results with syntax highlighting, matched nodes, and error feedback.
- [YAML Validator Online](https://devtoollab.com/tools/yaml-validator): Validate YAML syntax instantly with detailed error messages and line numbers. Check Kubernetes manifests, Docker Compose files, CI/CD configs, and any YAML document for correctness.
- [Zod Playground](https://devtoollab.com/tools/zod-playground): Write and test Zod validation schemas directly in your browser. Paste JSON data, see live field-level error messages and parsed output. Supports the full Zod v3 API. No install required.

### Viewers
- [Avro Viewer](https://devtoollab.com/tools/avro-viewer): Avro viewer that opens .avro files in your browser: browse records in a table, read the schema, export to JSON or CSV. Reads deflate and snappy files. Free.
- [CSV Viewer Online](https://devtoollab.com/tools/csv-viewer): CSV viewer online: open a CSV from a URL, upload a file, or paste data, then search, sort, and filter it in a clean table. Shareable ?url= links, custom delimiters, large files.
- [DBF Viewer](https://devtoollab.com/tools/dbf-viewer): DBF viewer that opens dBase, FoxPro and shapefile .dbf tables in your browser. Search and filter records, read memo fields, export to CSV or JSON. Free.
- [EML Viewer](https://devtoollab.com/tools/eml-viewer): EML viewer that opens .eml and .emlx email files in your browser: rendered message, headers, attachments and MIME parts. Blocks tracking pixels. Free.
- [EXE Viewer](https://devtoollab.com/tools/exe-viewer): EXE viewer and DLL analyzer for Windows PE files: see the signer, version info, imports, exports, sections and entropy of any .exe or .dll. Free, no upload.
- [GGUF Viewer](https://devtoollab.com/tools/gguf-viewer): GGUF viewer that reads model metadata, tensors, quantization and the chat template from the header, so even a 70B file opens instantly. Nothing uploaded.
- [Hex Dump Viewer](https://devtoollab.com/tools/hex-dump-viewer): Hex dump viewer that turns pasted text or an uploaded file into a canonical hexdump with byte offsets, hex columns and an ASCII gutter. Free, no upload.
- [Hex Viewer Online](https://devtoollab.com/tools/hex-viewer): Hex viewer online: open any binary file and read it as a hex dump with offsets and an ASCII column. Detects the file type from magic bytes, searches text or hex patterns, jumps to any offset.
- [HTML Live Editor & Preview Online](https://devtoollab.com/tools/html-live-editor): HTML playground with live preview and shareable links. Write HTML, CSS, and JavaScript, watch it auto-run, and share the code in a URL - no login, no setup, nothing stored.
- [IPYNB Viewer](https://devtoollab.com/tools/ipynb-viewer): Open and view .ipynb Jupyter notebooks online with rendered Markdown, tables, charts and tracebacks. Export ipynb to py or Markdown. No upload, no signup.
- [JSON Viewer Online](https://devtoollab.com/tools/json-viewer): View and explore JSON data in an interactive collapsible tree structure. Search, filter, and navigate nested objects and arrays. Free online JSON viewer with no signup required.
- [JSONL Viewer](https://devtoollab.com/tools/jsonl-viewer): JSONL viewer that turns JSON Lines and NDJSON files into a searchable table in your browser. Validates every line with line numbers, then exports to a JSON array or CSV. Free, nothing uploaded.
- [JUnit XML Viewer](https://devtoollab.com/tools/junit-xml-viewer): JUnit XML viewer that turns a test report into a readable list of passed, failed, errored and skipped tests with messages and timings. Paste or upload. Free.
- [Lua Bytecode Viewer](https://devtoollab.com/tools/lua-bytecode-viewer): Lua bytecode viewer for .luac files: lists every function, constant, string and instruction like luac -l. Reads Lua 5.1 to 5.5 in your browser. Free.
- [MBOX Viewer](https://devtoollab.com/tools/mbox-viewer): MBOX viewer that opens .mbox mail archives from Google Takeout, Thunderbird and Apple Mail in your browser. Search, read and save emails, export CSV. Free.
- [Mermaid Diagram Renderer](https://devtoollab.com/tools/mermaid-diagram-renderer): Render Mermaid diagram syntax into SVG diagrams online. Supports flowcharts, sequence diagrams, class diagrams, Gantt charts, state diagrams, and more.
- [MSG Viewer](https://devtoollab.com/tools/msg-viewer): MSG viewer that opens Outlook .msg email files in your browser without Outlook. Read the message, headers and attachments, or convert MSG to EML. Free.
- [NPY Viewer](https://devtoollab.com/tools/npy-viewer): NPY viewer that opens NumPy .npy and .npz files in your browser with shape, dtype, stats, a scrollable table, an image preview and CSV export. No Python.
- [Parquet Viewer](https://devtoollab.com/tools/parquet-viewer): Parquet viewer that opens .parquet files in your browser. Read the schema and row groups, browse and search rows, and export to CSV or JSON. Nothing uploads.
- [PGP Key Viewer](https://devtoollab.com/tools/pgp-key-viewer): PGP key viewer that decodes an armored public key block: fingerprint, key ID, algorithm, user IDs, subkeys, expiry and packets. Runs in your browser. Free.
- [Pickle Viewer](https://devtoollab.com/tools/pickle-viewer): Pickle viewer that opens .pkl, .pickle and PyTorch .pt files without running them. Shows the object tree and opcodes, and flags os.system payloads. Free.
- [Raw File Viewer](https://devtoollab.com/tools/raw-file-viewer): View the raw contents of any file online - decoded text in UTF-8, Latin-1, or Windows-1252, plus a byte-level hex dump. Auto-detects binary files. Free, private, no upload.
- [Safetensors Viewer](https://devtoollab.com/tools/safetensors-viewer): Safetensors viewer that reads tensor names, shapes, dtypes and __metadata__ from the header, so a 15 GB model opens in a second. Shows LoRA tags. Free.
- [SARIF Viewer](https://devtoollab.com/tools/sarif-viewer): SARIF viewer that turns CodeQL, Semgrep or ESLint SARIF output into a list of findings by severity, rule and file:line, with filters and search. Free.
- [SQLite Viewer](https://devtoollab.com/tools/sqlite-viewer): SQLite viewer that opens .db, .sqlite and .sqlite3 files in your browser. Browse every table, search rows, read the schema and export to CSV or JSON. Free.
- [SVG Viewer](https://devtoollab.com/tools/svg-viewer): SVG viewer renders SVG code or uploaded .svg files instantly in your browser with zoom, checkerboard, light and dark backgrounds, size info and PNG export. Free, no upload.
- [Swagger Viewer Online](https://devtoollab.com/tools/swagger-viewer): Swagger viewer and OpenAPI explorer online. Load a spec from a URL or paste JSON/YAML, browse endpoints and schemas, and send live test calls. Free.
- [TAR.GZ Viewer](https://devtoollab.com/tools/tar-gz-viewer): Open .tar.gz, .tgz and .tar files online and browse every file inside. Preview or extract single files, convert to ZIP and flag tar-slip paths. No upload.
- [Terraform State Viewer](https://devtoollab.com/tools/terraform-state-viewer): Terraform state viewer parses terraform.tfstate into a searchable resource tree with providers, modules, outputs and attribute counts. Free, in-browser.
- [X12 EDI Viewer](https://devtoollab.com/tools/x12-edi-viewer): X12 EDI viewer and parser for 850, 810, 856, 837 and 835 files. Names every segment and element and checks ISA, GS and ST control numbers. Free, no upload.
- [ZIP File Extractor](https://devtoollab.com/tools/zip-file-extractor): ZIP file extractor opens any .zip, .jar, .apk or .docx in your browser, lists every file with its size, previews text and downloads single entries. Nothing is uploaded.