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Free Dev Tools

Six browser-based developer utilities. No sign-up, no server, no tracking. Everything runs locally in your browser.

Tools

Tool Description Try It
CSS/JS Minifier Minify CSS and JavaScript using csso + Terser Live Demo
JSON Formatter Format, validate, and diff-compare JSON Live Demo
Image Optimizer Compress and resize images using Canvas Live Demo
Regex Tester Test regex with real-time matching and groups Live Demo
JWT Decoder Decode and inspect JSON Web Tokens Live Demo
Markdown Previewer Live Markdown preview with GFM support Live Demo

Features

  • 100% Client-Side — Nothing is uploaded. All processing happens in your browser.
  • No Sign-Up — No accounts, no cookies, no tracking.
  • Open Source — MIT licensed. Fork it, self-host it, modify it.
  • Mobile Friendly — Responsive design works on all devices.

Self-Hosting

Clone and serve with any static file server:

git clone https://github.com/btwigley/free-dev-tools.git
cd free-dev-tools

# Python
python -m http.server 8000

# Node
npx serve .

# Or just open index.html in your browser

No build step required. All dependencies are loaded from CDN.

Tech Stack

  • Vanilla JavaScript (no frameworks)
  • csso — CSS minification
  • Terser — JavaScript minification
  • JSZip — ZIP file generation
  • marked — Markdown parsing
  • DOMPurify — HTML sanitization

License

MIT — see LICENSE.

Built by Wigley Studios