Compress and minify CSS stylesheets to reduce file size and improve page load speed.
This free online CSS minifier and compressor strips comments, removes unnecessary whitespace, and collapses redundant semicolons to produce the smallest possible stylesheet without altering its visual output. Smaller CSS files mean faster page loads and better Core Web Vitals scores, making this tool valuable for any web developer optimizing a site for production. The tool shows you the exact byte savings so you can measure the impact instantly.
The minifier applies a series of regular-expression transformations directly in your browser: it strips /* ... */ block comments, removes whitespace around braces, colons, semicolons, and commas, eliminates trailing semicolons before closing braces, and collapses multiple spaces into one. The result is a compact single-line stylesheet that is functionally identical to the original. The tool then calculates and displays the exact character-count reduction so you can see the savings at a glance.
Yes - minified CSS is the standard practice for production websites. Every major web framework (Next.js, Nuxt, Vite, Create React App) minifies CSS automatically in production builds for exactly this reason. The only precaution is to keep your original, readable source file - never edit the minified version directly. A good workflow is to maintain the formatted source in version control and use the minified output for deployment.
Typical CSS minification removes 20-40% of the original file size. Stylesheets with many comments and generous spacing see higher reductions, while already-compact code sees less. For the largest gains in production, combine minification with gzip or Brotli compression at the server level - gzip compresses minified CSS by an additional 60-70%, resulting in files that are 80-90% smaller than the original uncompressed source.
No - the transformations applied (whitespace removal, comment stripping, trailing semicolon removal) are well-defined in the CSS specification and are handled identically by all modern browsers. The minifier does not alter property values, shorten colors, or combine shorthand properties, so vendor-prefixed rules and browser-specific hacks remain intact after minification.
Yes - after minifying, click the Download button to save the output as a .min.css file directly from your browser. This uses the browser's native Blob download API, which means the file is generated entirely client-side with no server request. The downloaded file is ready to reference in a <link> tag or upload to your hosting environment immediately.