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CSS Minifier Online – Compress CSS Free
Minify CSS online by removing comments, collapsing whitespace, and stripping redundant values. Instant results, no upload — supports plain CSS, SCSS output, and PostCSS.
CSS Minifier
Ready to minify
Paste your CSS on the left and the result will appear here instantly
What is CSS Minifier?
Reduce CSS file size by stripping comments, collapsing whitespace, removing trailing semicolons, and simplifying zero values. Results appear instantly as you type. Download the minified file or copy it straight to clipboard. All processing is done client-side — your styles never leave your browser.
CSS Minifier Features
Instant Minification
Output updates live as you type or paste — no button press needed.
5 Optimization Rules
Toggle comments, whitespace, trailing semicolons, zero units, and leading zeros independently.
Size Stats
Shows original vs. minified byte count and exact percentage saved.
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CSS Minifier FAQ
No — the tool only removes safe whitespace and comments and simplifies redundant values. Your CSS rules and selectors are preserved exactly.
It works on any valid CSS output. If you use SCSS or PostCSS, compile to plain CSS first and then run it through the minifier.
Well-formatted stylesheets typically shrink 30–60%. Combined with gzip/Brotli on the server, savings compound significantly.
It rewrites values like 0px, 0em, 0rem to just 0. CSS specifications allow unitless zero for length values, saving a few bytes per occurrence.