CSS Minifier
Strip whitespace and comments while protecting strings, url() and calc()
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Minified CSS will appear here
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CSS Minifier – Compress CSS, Protect calc() & url()
Minify CSS by removing comments, collapsing whitespace, and simplifying zero units while protecting strings, url(), and calc()-family expressions.
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What is CSS Minifier?
Reduce standard CSS file size by stripping comments, collapsing whitespace, and simplifying zero values. String literals, url() contents, and calc()/clamp()/min()/max() expressions are protected from the minification pass. Results appear instantly as you type. Download the minified file or copy it to the clipboard. Compile SCSS or PostCSS to CSS before using this tool; processing is client-side.
- css
- minifier
- compress
- whitespace
- optimize
- stylesheet
Features
What you get with CSS Minifier.
Instant Minification
Output updates live as you type or paste — no button press needed.
Corruption-Safe
String literals, url() paths, and calc() expressions are protected from being altered.
Size Stats
Shows original vs. minified byte count and exact percentage saved.
How to use CSS Minifier
Follow these steps to get the best results.
Paste your CSS
Paste a stylesheet or snippet — minified output appears instantly as you type.
Review the size stats
See original vs. minified bytes and the percentage saved.
Copy or download
Copy the minified CSS to your clipboard or download it as a file.
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Frequently asked questions
Common questions about CSS Minifier.
No — comments and whitespace are removed safely, and the tool specifically protects string values, url() paths, and calc()/clamp()/min()/max() expressions from being altered, since collapsing spaces inside those can change their meaning.
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 20–40% from comment and whitespace removal. Combined with gzip/Brotli on the server, savings compound further.
It automatically rewrites values like 0px, 0em, 0rem to just 0. CSS specifications allow unitless zero for length values, saving a few bytes per occurrence. This happens automatically and isn't a separate toggle.
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