CSS Minifier — Free Online Tool
Strip comments and unnecessary whitespace to shrink your CSS.
About CSS Minifier
The CSS Minifier shrinks your stylesheets by removing comments, redundant whitespace, and unnecessary characters around braces and separators. Smaller CSS files download faster, which improves page speed scores and the overall experience for your visitors.
All processing happens locally in your browser, so even large or private stylesheets are minified instantly without ever being uploaded. After each run the tool reports exactly how many characters you saved, making it easy to see the benefit.
How to Use CSS Minifier
- Paste your CSS into the input box.
- Click 'Minify' to strip comments and collapse whitespace.
- Review the saved-character summary shown above the output.
- Click 'Copy Result' to grab the minified CSS for your project.
Key Features
Removes comments and collapses unnecessary whitespace
Tidies spacing around braces, colons, semicolons, and combinators
Reports exactly how many characters you saved
One-click copy and clear for a fast workflow
100% client-side with no uploads, signup, or limits
Frequently Asked Questions
What does the CSS Minifier remove?
It strips out comments, collapses runs of whitespace, removes spaces around braces, colons, semicolons, and combinators, and drops the final semicolon before a closing brace. The result is functionally identical CSS in far fewer characters.
Will minifying break my stylesheet?
No. The tool only removes characters that browsers ignore, so your styles render exactly the same. It does not rename selectors or rewrite property values.
How much smaller will my CSS be?
Savings vary with how your CSS is formatted, but heavily commented and indented stylesheets often shrink by 20 to 50 percent. The tool shows you the exact character count saved after each minify.
Is my CSS uploaded anywhere?
No. Minification happens entirely in your browser, so your stylesheet never leaves your device and you can minify as many files as you like.