CSS Minifier
Strip comments and collapse whitespace in CSS to shrink stylesheet size before shipping it.
How this tool works
Paste your CSS
Any stylesheet, including media queries and vendor prefixes.
Comments and whitespace are removed
Non-essential spacing around braces, colons, and commas is stripped along with comments.
Check the byte reduction
Before/after size and percentage saved are shown side by side.
Copy the minified stylesheet
Grab the compact output ready for production.
Quick facts
- Category
- Formatters & Beautifiers
- Best for
- Reducing stylesheet size for faster page loads
About this tool
Paste CSS and get it compacted by removing comments, collapsing the whitespace around braces, colons, and commas, and dropping the trailing semicolon before a closing brace - all without touching the actual property values or selectors, so the compressed output remains functionally identical to the source. Before/after byte counts and a percentage reduction show exactly how much smaller the stylesheet gets, which matters directly for page-load performance since CSS blocks rendering until it downloads. This is a whitespace-and-comment minifier, not a full CSS optimizer - it won’t merge duplicate rules, shorten color values, or reorder properties, so it’s safe to run on any valid stylesheet. Runs entirely client-side.
Why use this tool
Selectors and values untouched
Only whitespace and comments are removed - property values and the cascade stay exactly as written.
Visible size savings
Before/after byte counts show the real bandwidth impact, not just a vague "smaller" claim.
Handles modern CSS
Media queries, custom properties, and vendor-prefixed rules all pass through safely.
No build tooling needed
Minify a stylesheet without wiring up a CSS build step for a one-off file.
Frequently asked questions
No - only comments and non-significant whitespace (around braces, colons, commas, and semicolons) are removed. Selectors, property names, and values are left exactly as written, so the visual result is identical; the only difference is the file transfers faster.
Yes - the minifier operates on whitespace and comment patterns rather than parsing CSS into a syntax tree, so vendor-prefixed properties, @media blocks, custom properties (CSS variables), and nested @supports rules all pass through safely.
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