CSS Minifier
Compress CSS to reduce file size
CSS Minifier is a free online tool from BrowserUtils that compress css to reduce file size. It runs entirely in your browser — your data never leaves your device. No account required.
How to use CSS Minifier
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About CSS Minifier
Free online CSS minifier. Remove whitespace, comments, and unnecessary characters from CSS to reduce file size. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
CSS Minifier specs
- Runtime
- 100% client-side (browser)
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
How do I minify CSS to improve page speed?
Paste your CSS into the input field and the minifier will strip all comments, whitespace, and unnecessary semicolons. The resulting compressed output can significantly reduce file size and improve page load times.
Is minified CSS still valid and functional?
Yes, minified CSS is fully valid and renders identically to the original. Only non-essential characters like comments and extra whitespace are removed, so all your styles and selectors remain intact.
How much file size reduction does CSS minification achieve?
Typical savings range from 15% to 40% depending on how many comments and how much whitespace the original file contains. Heavily commented stylesheets see the largest reductions.
Can I minify CSS offline with this tool?
Yes, once the page has loaded, the minifier runs entirely in your browser. No internet connection is needed for the actual minification process.
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