Free CSS Minifier - Compress CSS for Faster Websites

CSS minification reduces stylesheet file size by stripping whitespace, comments, and redundant characters while keeping every rule functionally identical. Smaller CSS files reduce render-blocking time and directly improve Google Core Web Vitals scores - particularly Largest Contentful Paint (LCP) and Total Blocking Time (TBT).

This minifier handles the full range of CSS optimizations: removing whitespace between rules and declarations, stripping single-line and multi-line comments, shortening hex color values (#FFFFFF to #FFF), removing redundant units from zero values (0px to 0), and trimming trailing semicolons before closing braces. It safely processes complex stylesheets including media queries, @keyframe animations, CSS custom properties (variables), and modern nesting syntax without breaking any functionality.

The beautify mode reverses the process - useful when you receive a minified stylesheet and need to read or edit it. Paste compressed CSS and get back an indented, readable version with consistent formatting.

Useful for projects where a CSS preprocessor or build tool like webpack, Vite, or Parcel is not handling minification. Paste your stylesheet, click minify, and download the .min.css file or copy the output directly into a CDN or inline style block.

All processing runs client-side in your browser. No stylesheets are uploaded to any server - safe for proprietary design systems, client work under NDA, or any CSS you prefer not to share externally.