Free Developer Tools

67+ free online tools for developers. No signup, no ads, no tracking. Most run entirely in your browser — your data never leaves your machine.

67+
Tools
$0
Forever Free
0
Ads
100%
Open Access
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AI Landing Page Generator
Describe your product, get a professional landing page in seconds. Live preview free, download full HTML/CSS for $9.99. 5 design styles, responsive, no dependencies.
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CSS Border Radius Generator
Create custom rounded corners, circles, pills, and organic blob shapes visually. Simple and advanced (8-value) modes with 12 presets. Copy production-ready CSS.
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Aspect Ratio Calculator
Calculate aspect ratios, resize dimensions proportionally, and find common ratios for video, images, and screens. Presets for YouTube, TikTok, Instagram, and more.
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Tailwind CSS Colors
Complete Tailwind CSS v3 color palette. Click any shade to copy hex, RGB, HSL, or class name. Generate custom 50-950 palettes. WCAG contrast checker built in.
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CSS Grid Generator
Build CSS Grid layouts visually. Define columns, rows, gap, and item placement with 8 presets. Copy production-ready CSS and HTML instantly.
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String Case Converter
Convert text between 12+ naming conventions: camelCase, PascalCase, snake_case, kebab-case, SCREAMING_SNAKE, dot.case, Title Case, and more. Bulk mode included.
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JSON to TypeScript
Paste any JSON, get perfect TypeScript interfaces. Handles nested objects, arrays, nullables, union types. Export as interface or type alias.
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CSS Flexbox Generator
Visual CSS Flexbox playground. Configure direction, alignment, wrapping, gaps, and per-item flex properties. Live preview + copy generated CSS and HTML.
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Number Base Converter
Convert between binary, decimal, hex, octal, and any base (2-36). Bit visualization, power-of-2 detection, ASCII lookup. Handles BigInt for large numbers.
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Markdown Table Generator
Build Markdown tables visually. Add rows/columns, set alignment, import CSV data, and copy perfectly formatted tables for GitHub, GitLab, and Reddit.
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Meta Tag Generator
Generate perfect SEO meta tags, Open Graph, and Twitter Cards. Preview how your page looks on Google, Facebook, Twitter, and LinkedIn. Copy with one click.
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CSS Gradient Generator
Create beautiful CSS gradients with a visual editor. Linear, radial, and conic gradients. 16 presets, custom color stops, angle control. Copy CSS instantly.
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Placeholder Image Generator
Generate placeholder images for mockups and development. Custom sizes, colors, text. SVG or PNG. Data URI output for embedding. 12 size presets included.
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Regex Tester
Test and debug regular expressions with real-time match highlighting. View capture groups, run replace operations, and use the built-in cheat sheet.
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HTML Entity Encoder / Decoder
Encode and decode HTML entities. Named entities, decimal codes, hex codes. Full reference table with 50+ common entities. Prevent XSS, display HTML safely.
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Image to Base64 Converter
Convert images to Base64 data URIs for embedding in HTML, CSS, or JavaScript. Supports PNG, JPG, GIF, SVG, WebP. Get data URI, CSS, and HTML output.
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JSON Formatter & Validator
Format, validate, and minify JSON instantly. Syntax highlighting, error detection, and tree view. Paste messy JSON, get clean output.
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B64
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 to text. Handles UTF-8, binary data, and data URIs. Instant, private, runs in your browser.
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JWT
JWT Decoder & Inspector
Decode and inspect JSON Web Tokens. View header, payload, claims, and expiration. Check if your JWT is expired. No data sent to any server.
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Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Auto-detects seconds vs milliseconds. Live clock, relative time, Y2K38 info.
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Password Generator
Generate strong, cryptographically secure passwords. Customize length, character sets, presets (PIN, passphrase, memorable). Bulk generate up to 100.
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Color Converter & Picker
Convert colors between HEX, RGB, HSL, and CMYK. Pick colors, generate palettes (complementary, analogous, triadic), check WCAG contrast ratios.
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UUID / GUID Generator
Generate UUID v4 (random) and v7 (time-ordered) identifiers. Bulk generation up to 1000, multiple output formats, copy or download.
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Hash Generator (MD5/SHA)
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes. Hash text or files. Compare hashes side-by-side. Uses Web Crypto API.
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.gitignore Generator
Generate .gitignore files for any language or framework. Pick your stack, get a ready-to-use .gitignore. Covers 20+ languages and frameworks.
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License Generator
Generate open-source license files. MIT, Apache 2.0, GPL, BSD, ISC, and more. Fill in your name and year, copy the complete LICENSE file.
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QR Code Generator
Generate QR codes for URLs, text, WiFi, email, phone, and vCards. Customize colors, size, error correction. Download as PNG or SVG.
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Markdown Preview
Write Markdown and see it rendered in real-time. Split editor with toolbar, GitHub Flavored Markdown, tables, task lists, code blocks. Export to HTML.
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URL Encoder / Decoder
Encode or decode URLs and query strings. Supports encodeURIComponent and encodeURI modes. Parse URLs into components. Quick reference table.
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Text Diff / Compare
Compare two texts and see additions, deletions, and unchanged lines highlighted. Ignore case, whitespace, trim options. LCS-based diff algorithm.
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CSS Minifier / Beautifier
Minify CSS to reduce file size or beautify minified CSS for readability. Shows exact savings percentage. Remove comments, shorten values, compress hex colors.
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SQL
SQL Formatter & Beautifier
Format, beautify, and minify SQL queries. Supports SELECT, INSERT, JOIN, subqueries, CTEs. Customizable indentation and keyword casing.
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Y/J
YAML ↔ JSON Converter
Convert between YAML and JSON instantly. Supports nested objects, arrays, comments. Sample templates for Docker Compose, Kubernetes, GitHub Actions.
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Wc
Word & Character Counter
Count words, characters, sentences, paragraphs, and estimate reading time. Real-time keyword density analysis. Paste any text, get instant stats.
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Lorem Ipsum Generator
Generate lorem ipsum placeholder text for designs and mockups. Choose paragraphs, sentences, words, or list items. Plain text, HTML, or Markdown output.
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AI Regex Generator
Describe what you want to match in plain English, get a working regex. AI generates the pattern with explanation and test cases.
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AI Cron Expression Generator
Describe your schedule in plain English — "every weekday at 9am" — and get the correct cron expression with human-readable explanation.
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AI README Generator
Generate professional README.md files for your projects. Describe your project, get a complete README with badges, install instructions, and API docs.
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AI Changelog Generator
Generate changelogs from your commit messages or release notes. AI organizes changes into Added, Changed, Fixed, Removed categories.
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AI Content Repurposer
Turn one piece of content into 8 formats: tweet thread, LinkedIn post, newsletter, Instagram caption, TikTok script, Reddit post, and more.
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AI Business Name Generator
Generate creative business and brand name ideas. Describe your business, get unique name suggestions with domain availability hints.
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AI ROI Calculator
Calculate the ROI of implementing AI automation in your business. Input your costs and hours, get projected savings and payback period.
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CSS Box Shadow Generator
Create beautiful CSS box shadows with a visual editor. Multiple layers, inset shadows, 12 presets (neumorphism, glow, neon, material). Copy CSS instantly.
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CSV ↔ JSON Converter
Convert CSV to JSON or JSON to CSV instantly. Handles quoted fields, custom delimiters (comma, semicolon, tab, pipe), auto-detect numbers. Table preview.
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Chmod Calculator
Interactive Unix file permission calculator. Toggle permissions visually or enter octal numbers. Get chmod commands instantly. 12 common presets included.
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JS Minifier / Beautifier
Minify JavaScript to reduce file size or beautify minified code for readability. Remove comments, whitespace, console.log. Shows savings percentage.
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HTML Minifier / Beautifier
Compress HTML to reduce page size or beautify minified markup. Remove comments, collapse whitespace, shorten boolean attributes. Shows savings stats.
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Favicon Generator
Create favicons from text, emoji, or images. Generates all sizes (16-512px), ICO format, Apple Touch Icon, and complete HTML meta tags. Download all at once.
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Robots.txt Generator
Generate a valid robots.txt file for your website. Configure crawl rules per bot, set sitemaps, block AI crawlers. 6 presets including WordPress, Next.js, E-commerce.
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JSON Schema Generator
Paste any JSON, get a valid JSON Schema (draft-07/2020-12). Infers types, required fields, formats (email, URI, date), nested objects, arrays. 6 sample templates.
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XML Formatter & Validator
Format, beautify, minify, and validate XML. Tree view, sort attributes, error detection. Supports RSS, SVG, sitemaps, SOAP, Maven POM, Android layouts.
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User Agent Parser
Parse any User-Agent string to detect browser, OS, device type, rendering engine, and bot status. See your own UA instantly. 10 sample agents included.
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HTTP Status Codes
Complete HTTP status code reference with search, filtering, and detailed explanations. Every code from 100 to 511 with examples and REST API best practices.
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Text to Binary Converter
Convert text to binary, hex, octal, and decimal — or decode binary back to text. Bit visualization, character breakdown, ASCII reference table. Handles UTF-8 and emoji.
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AI Commit Genius (VS Code)
VS Code extension that generates meaningful commit messages from your diffs. Supports 5 AI providers including local/offline mode. Coming soon to Marketplace.
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CSS Clip-Path Generator
Visual CSS clip-path editor. Drag polygon handles, choose from 12+ presets (circle, star, arrow, hexagon, chevron, chat bubble). Copy ready-to-use CSS with webkit fallback.
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Pomodoro Timer
Classic Pomodoro technique timer with circular SVG progress ring, browser notifications, keyboard shortcuts, and daily stats. Customizable work/break durations.
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JSON Diff Viewer
Compare two JSON objects side-by-side with color-coded diff. Green=added, red=removed, yellow=modified. Deep nested comparison with path tracking and diff report export.
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PX to REM Converter
Convert pixels to rem and rem to px instantly. Customizable base font size, bulk converter, conversion table, and ready-to-copy CSS output for responsive design.
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CSS Animation Generator
Create CSS keyframe animations visually. 18 presets (bounce, fade, spin, shake, pulse), custom keyframes editor, timing controls, and live preview with copy-ready CSS.
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JavaScript Keycode Finder
Press any key to get its keyCode, key, code, which, and location values. Key history, code snippets, modifier detection, and full keycode reference table.
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Privacy Policy Generator
Generate a comprehensive privacy policy for your website or app. Covers GDPR, CCPA, cookies, analytics. Download in HTML, Markdown, or plain text.
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Emoji Picker & Unicode Search
Search, browse, and copy 1800+ emojis instantly. See Unicode codepoints, HTML entities, CSS codes, and shortcodes for every emoji.
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Crontab Guru
Understand cron expressions instantly. Human-readable explanations, next 10 run times, visual field breakdowns, and 16 common presets.
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Why Use MatrixAI Developer Tools?

MatrixAI offers a growing collection of free developer tools designed for speed, privacy, and simplicity. Unlike bloated alternatives filled with ads and trackers, our tools are lightweight, fast, and respect your data.

🔒 Privacy First

Most of our tools run 100% client-side — your data never leaves your browser. No analytics tracking, no cookies, no server-side logging. For AI-powered tools, we use minimal API calls and never store your inputs.

âš¡ Built for Speed

No bloated frameworks, no unnecessary dependencies. Every tool loads fast and works instantly. Client-side tools work offline once loaded. AI tools respond in under 2 seconds.

🛠️ Made by Developers, for Developers

Every tool solves a real problem that developers face daily. UUID generation, JSON formatting, JWT debugging, regex testing, timestamp conversion — the stuff you Google every week, now in one place.

🆓 Free Forever

All tools are free. No signup, no credit card, no usage limits on client-side tools. AI-powered tools have generous free tiers. We make money from our paid products, not from gating basic dev tools behind paywalls.

Frequently Asked Questions

Are these developer tools free?

Yes, all 67+ tools are completely free. No paywalls, no usage limits on client-side tools, no credit card required. AI-powered tools have generous free tiers. MatrixAI makes money from paid products, not from gating basic dev tools.

Is my data safe when I use these tools?

Yes. Most tools run 100% client-side — your data never leaves your browser. There is no analytics tracking, no cookies, and no server-side logging of your inputs. For AI-powered tools (like the Regex Generator and Cron Generator), minimal API calls are used and inputs are never stored.

Do I need to create an account?

No. Every tool works instantly without signup, login, or email verification. Just open a tool and start using it.

Do the tools work offline?

Client-side tools work offline once the page is loaded. AI-powered tools require an internet connection for the generation step, but all formatting, validation, and conversion tools are fully local.

How many tools are available?

There are 67+ free tools across JSON utilities, CSS generators, encoding/decoding, text processing, AI generators, and productivity tools. New tools are added regularly — browse them all above or use the search bar to find what you need.

Need More Power?

Our AI Content Repurposer API offers Pro ($9/mo) and Unlimited ($29/mo) tiers for high-volume content generation.

View API Pricing →