Compress CSS to reduce file size. Paste your CSS and get an optimized version instantly.
Frequently Asked Questions
What does CSS minification do?
Removes whitespace, line breaks, comments, and unnecessary characters. Shortens color codes (#ffffff → #fff), removes units from zero (0px → 0), and optimizes values. Reduces file size by 20-50%.
Is minified CSS harder to read?
Yes — it's compressed into a single line. Keep your original for development and only use minified in production.
Does minification change how CSS works?
No. Only removes characters that don't affect browser rendering. Visual result is identical.
How much smaller does CSS get?
Typically 20-50%. Well-formatted CSS with comments sees the biggest savings.
Is my CSS sent to a server?
No. All minification happens in your browser. No network requests, no storage.
Should I minify in development?
No — keep readable CSS for debugging. Only minify for production. Build tools like Webpack/Vite handle this automatically.
What optimizations are applied?
Removes comments, collapses whitespace, removes unnecessary semicolons, shortens hex colors, removes units from zero, and strips empty rules.
Can I minify multiple files?
One at a time here. For multiple files, use cssnano or clean-css in your build pipeline.