CSS Minifier — Free Online Tool
Minify and compress CSS stylesheets online for free. Remove whitespace, comments, and redundant rules to reduce CSS file size. Instant result.
About CSS Minifier
CSS minification removes all whitespace, comments, and redundant characters from stylesheets, significantly reducing file size and improving website load speed. Smaller CSS files load faster, reduce bandwidth costs, and contribute to better Core Web Vitals scores. Our CSS minifier handles standard CSS, removes vendor-prefixed duplicate rules, shortens colour values, and removes unnecessary semicolons. The minified output is production-ready. Paste your CSS or upload a .css file, click minify, and download or copy the result.
Frequently Asked Questions
Will minified CSS work the same as the original?
Yes — minification removes whitespace and comments that browsers ignore.
Does it shorten colour values?
Yes — colours like #ffffff are shortened to #fff where possible.
Can I minify CSS frameworks like Bootstrap?
Yes — large CSS files like Bootstrap can be minified.
How much file size reduction can I expect?
Typically 20-40% reduction depending on whitespace and comments.
Does it handle CSS custom properties?
Yes — CSS variables are fully supported and preserved.