CSS Minifier
Paste your CSS code below to compress rules and eliminate unused whitespace.
Why Minify CSS?
Stylesheets written for people include indentation, comments, and spacing that add bytes without changing rendering. Minifying removes them so the file transfers faster.
Faster stylesheets let the browser reach first paint sooner, which supports Core Web Vitals. Minification is most effective alongside gzip or Brotli compression and long-lived caching.
How CSS Minification Works
The tool runs clean-css in your browser with its default level 1 optimizations, removing comments and whitespace and shortening values such as colors and zero units. It does not perform level 2 restructuring such as merging adjacent rules.
After each run the exact original and minified byte sizes are shown, so you can judge the saving for your own stylesheet.
Frequently Asked Questions
What is CSS minification?
CSS minification removes whitespace, comments, and other unnecessary characters from a stylesheet so the browser downloads fewer bytes.
Will minified CSS work the same?
Yes. The minified output produces the same styles. The only difference is that the code is compressed and harder for a person to read.
Does the minifier merge or restructure rules?
No. The tool runs clean-css with its default level 1 settings, which remove whitespace and comments and normalize values such as colors and units, but do not restructure selectors. Merging adjacent rules or removing duplicate rules requires clean-css level 2 optimizations, which this tool does not enable.
How much can I reduce CSS file size?
It depends on how much whitespace, commenting, and formatting the original has, so there is no fixed percentage. The tool shows the exact original size, minified size, and percentage reduction for each run.