Generate ads.txt files for publishers with DIRECT or RESELLER seller lines, optional owner and manager directives, and instant copy or download.
AGENTS.md generator that turns your project setup, build, test and style rules into the instructions file Codex, Cursor and Claude Code read. Free.
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.
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.
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 that reads an Android app's manifest, permissions, exported components and signing certificate in your browser. Opens AAB and XAPK too. Free.
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.
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.
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.
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.
Generate production-ready bash script boilerplate with strict error handling, argument parsing, color logging, and cleanup traps. Configurable features. Free, browser-based, no signup.
Convert binary numbers (base-2) to decimal numbers (base-10) instantly. Supports large binary numbers, batch conversion, and handles 0b prefix automatically.
Birthstone calculator shows the modern and traditional birthstone for any birth month, with its color, Mohs hardness and care notes. Free, no signup required.
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 for sizing bit arrays: enter item count and target false positive rate to get bits, hash functions and memory. Free.
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.
See live browser details including user agent, platform, language, screen size, viewport, online status, and device capabilities.
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.
Calculate business days between dates or add/subtract working days. Supports US Federal holidays, custom holidays, and weekend configurations.
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.
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.
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.
Calculate cosine similarity, dot product, and Euclidean distance between two vectors instantly. Built for embeddings, RAG pipelines, and ML similarity scoring. Free tool.
Resolve ISO country codes to retrieve metadata including region, income level, and capital city in one lookup - runs entirely in your browser.
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.
Validate credit card numbers using the Luhn algorithm. Detect card types including Visa, Mastercard, American Express, Discover, and more.
Create custom CSS clip-path shapes with visual editor. Generate circles, ellipses, polygons, and inset shapes for creative web designs.
Build and preview CSS container queries live with a resizable @container playground. Generate copy-ready code client-side, free, no signup, for responsive components.
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.
Create stunning glassmorphism effects with visual editor. Generate modern glass-like UI elements with backdrop blur, transparency, and customizable properties.
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.
Calculate the specificity of any CSS selector. See the (a,b,c,d) breakdown for IDs, classes, attributes, and elements instantly.
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.
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.
Split large CSV files into smaller chunks by row count for uploads, imports, and batch workflows - runs in browser, no data sent.
CSV validator that checks delimiter consistency, ragged rows, duplicate headers, and encoding issues before you import the file. Paste or upload, free.
Cyclomatic complexity calculator scores every JavaScript and TypeScript function's decision-point complexity in your browser. Spot risky code before review. Free, no signup.
Cypress config generator for cypress.config.ts: E2E and component testing, base URL, viewport, video, retries, and env variables. Free, browser-based.
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.
Devcontainer.json generator builds a VS Code and Codespaces dev container config with features, forwarded ports, extensions and post-create commands.
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.
Check DNS propagation across global resolvers for A, AAAA, CNAME, MX, NS, and TXT records to confirm your DNS changes have spread.
Validate your .env file for naming convention errors, duplicate keys, invalid values, and formatting issues. Get line-by-line feedback instantly. Free, browser-based.
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 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.
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.
Find and replace text with support for regex, case-sensitive matching, whole word search, and multi-line replacement. Preview changes before applying.
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.
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.
Calculate fractions online: add, subtract, multiply, and divide fractions or mixed numbers. Shows step-by-step solution with simplified results and decimal equivalent.
Geohash converter that encodes latitude and longitude into a geohash and decodes any geohash back to coordinates, a bounding box and neighbors.
GGUF viewer that reads model metadata, tensors, quantization and the chat template from the header, so even a 70B file opens instantly. Nothing uploaded.
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.
Test file paths against your .gitignore rules and see exactly which pattern matched, on which line, and whether a negation won. Free, runs offline.
Glob to regex converter that turns wildcard patterns like src/**/*.ts into anchored JavaScript regex. Supports globstar, braces and classes.
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.
Grok pattern tester for Logstash and Elasticsearch. Match log lines against %{SYNTAX:SEMANTIC} patterns and preview every extracted field. Free, in-browser.
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.
Calculate GST amounts instantly. Add GST to base price or remove GST from inclusive price. Supports all GST rates with CGST and SGST breakdown.
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.
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.
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.
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.
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.
Rotate and flip images online for free. Rotate 90, 180, 270 degrees, flip horizontally or vertically, or use a custom angle. Download results instantly.
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.
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.
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.
Invisible character remover strips zero width spaces, BOMs, bidi overrides, and hidden tag characters, and names every codepoint it finds. Free and private.
Check ISBN-10 and ISBN-13 codes to fetch book metadata including title, publisher, publication date, and page count - free, no signup.
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.
Jenkinsfile generator builds a declarative Jenkins pipeline with agents, stages, triggers, environment variables and post actions. Copy or download, free, no signup.
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 Patch generator that diffs two JSON documents into RFC 6902 add, remove and replace operations. Apply a patch back to any document. Free.
Validate JSON documents against JSON Schema to catch missing fields, type errors, and invalid values - free, no install needed.
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.
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.
JSONPath tester evaluates expressions against your JSON and lists every matched node with its exact path. Filters, wildcards, slices. Free.
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.
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.
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.
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.
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.
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.
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 comparer finds items in both lists, items unique to each, the union, and duplicates inside each list. Free, browser-based, handles millions of rows.
Little's Law calculator for concurrency and throughput: enter any two of arrival rate, latency and in-flight requests to size a pool. Free.
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 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.
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.
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.
Create Markdown tables visually - set columns, rows, and alignments, then copy clean markdown code instantly. No signup or install needed.
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.
Check common MIME types using file signatures, browser-reported content types, and extension lookup. Useful for upload validation and content-type debugging.
Translate text to Morse code and Morse code to text instantly. Supports international standard for learning and fast conversion.
Multipart form data parser for raw HTTP request bodies. Split any multipart/form-data payload into named parts with filenames, types and sizes.
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.
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 finds your Life Path, Expression, Soul Urge and Personality numbers from your birth date and name, showing every reduction step. Free, no signup.
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.
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.
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.
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.
Check if a word or phrase is a palindrome. Supports ignoring spaces, punctuation, and letter case for flexible detection.
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.
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.
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.
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.
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.
Generate playwright.config.ts for end-to-end testing. Configure browsers, base URL, retries, workers, reporters, and trace on failure. Free, browser-based.
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.
Look up ZIP and postal code metadata by country to retrieve matching city and state location details instantly - no data sent to any server.
Pressure converter for Pascal, Bar, PSI, Atmosphere, mmHg, and Torr. Instant calculations with no install or signup - free browser-based tool.
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.
Prometheus metrics parser that turns exposition format into structured JSON. Reads HELP, TYPE, labels, histograms and OpenMetrics. Free, in-browser.
Look up public and national holidays for any country and year. Covers 100+ countries with dates, holiday names, and types.
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.
Calculate Flesch Reading Ease and Flesch-Kincaid Grade Level instantly to improve clarity in blogs, docs, and landing page copy.
Test regular expressions with real-time validation, match highlighting, and detailed explanations. Debug regex patterns quickly and efficiently.
Remove duplicate lines from text instantly. Sort lines, trim whitespace, and ignore case with this free online deduping tool.
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.
Instantly reverse text, words, or letters. Perfect for fun, puzzles, or mirroring text. Free browser-based tool with no signup required.
Create robots.txt files to control how search engine bots crawl your website. Allow or disallow specific agents and paths.
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.
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.
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.
Generate SHA-256 checksums for files in your browser to verify downloads, releases, and file integrity without uploading data.
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.
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.
Generate CREATE TABLE SQL statements visually. Define columns, types, and constraints for PostgreSQL, MySQL, SQLite, and SQL Server. Free, browser-based, no signup.
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.
Build SQL SELECT queries visually with columns, WHERE filters, GROUP BY, ORDER BY, and LIMIT. Generates clean SQL instantly. Free, no account required.
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.
SRI hash generator creates sha256, sha384, and sha512 subresource integrity values plus the matching script tag. Free, runs locally, nothing is uploaded.
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.
Stack trace parser turns raw JavaScript, Python, Java and Go traces into a clean frame table that separates your app code from vendor noise.
Compute sample and population standard deviation, variance, mean, and range from comma, space, or line-separated numeric values.
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.
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.
Syslog parser that decodes RFC 5424 and RFC 3164 lines into facility, severity, timestamp, hostname, app name and structured data. Free, in-browser.
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.
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.
Generate terraform.tfvars files from your variables.tf input. Parses variable blocks, infers types, and fills defaults or type-safe placeholders. Free, browser-based.
Analyze the readability of any text using Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, and ARI formulas. Find your text's grade level instantly.
Repeat any text, word, or sentence multiple times instantly. Custom separators, line numbering, and up to 10,000 repetitions. Copy or download the result.
Find the IANA timezone, current local time, and UTC offset for any city worldwide - live clock updates every second, no install needed.
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.
Expand shortened URLs from bit.ly, t.co, tinyurl, and others to reveal the final destination and full redirect chain - free tool.
Create UTM-tagged URLs for tracking marketing campaigns in Google Analytics. Build links with source, medium, campaign, term, and content parameters.
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.
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.
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.
Generate vitest.config.ts for React, Vue, Svelte, and Node projects. Configure test environment, coverage, globals, and setup files. Free, browser-based.
VLSM calculator that splits one network into right-sized subnets from your host counts. Shows CIDR, mask, host ranges, broadcast and wasted IPs. Free.
Convert WASM to WAT online: disassemble a WebAssembly binary into readable text with imports, exports, function names and SIMD. Runs in your browser. Free.
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.
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.
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.
Wildcard mask calculator that converts between CIDR, subnet mask and Cisco ACL wildcard bits, and flags non-contiguous masks. Free, no signup.
Track time across multiple cities and timezones simultaneously. Features real-time updates, DST support, day/night indicators, and time comparison table.
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 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.
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.
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.