Ultimate CSS/JS Minifier
Professional code minifier and beautifier with advanced compression, syntax highlighting, and detailed statistics
The Ultimate CSS/JS Minifier is a professional-grade tool for optimizing and formatting code. It supports four languages: CSS, JavaScript, HTML, and JSON, with both minification (compression) and beautification (formatting) modes. Minification removes unnecessary whitespace, comments, and characters to reduce file size and improve load times. Beautification adds proper indentation and formatting to make code more readable and maintainable.
Advanced features include aggressive minification for maximum compression, license comment preservation to maintain copyright notices, customizable indentation (2, 4, 6, or 8 spaces), and detailed statistics showing bytes saved, compression ratio, and lines reduced. The side-by-side comparison view lets you see exactly how your code changed, and the swap feature makes it easy to chain operations or verify that minification is reversible.
Whether you're optimizing production code for faster page loads, formatting messy code for better readability, or learning about code compression techniques, this tool provides everything you need. All processing happens locally in your browser for complete privacy and security. Perfect for web developers, frontend engineers, and anyone working with CSS, JavaScript, HTML, or JSON.
Four Languages
Minify and beautify CSS, JavaScript, HTML, and JSON with language-specific optimizations.
Aggressive Minification
Enable aggressive mode for maximum compression by removing optional semicolons and extra spaces.
License Comment Preservation
Automatically preserve license comments (/*! ... */) while removing other comments.
Customizable Indentation
Choose between 2, 4, 6, or 8 spaces for indentation when beautifying code.
Detailed Statistics
See input/output sizes, compression ratio, bytes saved, and lines reduced at a glance.
Side-by-Side Comparison
Compare input and output code side-by-side to see exactly what changed.
Swap & Switch Mode
Instantly swap input/output and switch between minify/beautify modes for chaining operations.
Error Handling
Clear error messages for invalid JSON or processing issues with helpful feedback.
Copy & Download
Copy output to clipboard or download as a file with the correct extension (.css, .js, .html, .json).
Real-Time Processing
See results instantly as you type with automatic minification or beautification.
Comment Control
Choose to preserve all comments, only license comments, or remove all comments during minification.
Privacy First
All processing happens in your browser - your code never leaves your device.