Free Online Developer Tools for Coding & Debugging
Minify, format, and validate your HTML, CSS, JavaScript, JSON, and Base64 directly in the browser. Use these free developer tools for quick code cleanup, optimization, and debugging.
Useful small tools for coding & debugging.
Minify, format and validate common web assets directly in your browser — perfect for quick fixes, debugging and optimization.
HTML Minifier / Beautifier
Quickly compress or pretty-print small HTML snippets. Great for inline components, embeds and code reviews.
Simple, safe transformations: comments removed on minify, basic indentation on beautify.
CSS Minifier / Prettifier
Clean up messy CSS or compress it for production. Comments and extra whitespace are stripped on minify.
JavaScript Minifier (Safe)
A lightweight browser minifier that safely removes comments and extra whitespace without changing your code’s behaviour.
For heavy production builds, still use tools like Terser or your bundler.
Base64 Encoder / Decoder
Convert text or small snippets to/from Base64. Useful for encoding keys, data URIs and quick debugging.
Uses UTF-8 safe encoding/decoding in the browser.
JSON Formatter & Validator
Validate JSON, pretty-print it for debugging, or compress it for production. Perfect for API responses.