Generate ads.txt files for publishers with DIRECT or RESELLER seller lines, optional owner and manager directives, and instant copy or download.
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.
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.
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.
Split large CSV files into smaller chunks by row count for uploads, imports, and batch workflows - runs in browser, no data sent.
Cyclomatic complexity calculator scores every JavaScript and TypeScript function's decision-point complexity in your browser. Spot risky code before review. Free, no signup.
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.
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.
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.
Calculate fractions online: add, subtract, multiply, and divide fractions or mixed numbers. Shows step-by-step solution with simplified results and decimal equivalent.
Calculate GST amounts instantly. Add GST to base price or remove GST from inclusive price. Supports all GST rates with CGST and SGST breakdown.
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.
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.
Validate JSON documents against JSON Schema to catch missing fields, type errors, and invalid values - free, no install needed.
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.
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.
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.
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.
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.
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.
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.
Look up public and national holidays for any country and year. Covers 100+ countries with dates, holiday names, and types.
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.
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.
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.
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.
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.
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.
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.
Track time across multiple cities and timezones simultaneously. Features real-time updates, DST support, day/night indicators, and time comparison table.
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.