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Minify CSS, remove comments and whitespace safely (strings and data URIs preserved) with a size-saved readout.
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CSS Minifier removes the whitespace and comments that inflate stylesheet size without affecting styling, producing smaller CSS that loads and transfers faster, a simple win for page performance and Core Web Vitals.
It's safe by design: CSS ignores whitespace and comments, so stripping them changes nothing about how your styles apply. The browser reads minified and formatted CSS identically, and minification doesn't touch selectors or property values, so behaviour is preserved while the file shrinks.
The size saving depends on how verbose and commented your source is, well-documented stylesheets compress more than already-tight ones. The tool reports the exact reduction so you can see the benefit for your specific file.
Minification runs in your browser, keeping your code private. Always keep an unminified copy for editing, automate the step in your build for production sites, and use this tool for one-offs and quick checks. Pair it with the HTML Minifier and other ToolsMonk developer tools.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | Developer Tools |
Paste your CSS
Click Process
Comments and unnecessary whitespace are removed
Copy the minified CSS and see the size saved
Removes whitespace, comments, and redundant characters from CSS
Reduces stylesheet size for faster page loads
Shows the size reduction achieved
Keeps the styling identical while shrinking the source
Runs in your browser, your code is never uploaded
Free, with no signup and no rate limit
Minifying CSS before deploying for better performance
Reducing stylesheet transfer size
Cleaning generated or verbose CSS to its smallest form
Improving page-load and Core Web Vitals by trimming CSS
Always keep an unminified source, minified CSS is impractical to edit by hand
For production, automate minification in your build; use this for one-offs and quick checks
Minify after you've finished editing, not before, so you work with readable source
Common questions about this tool, its workflow, and what to expect before you use it.
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Minify CSS, remove comments and whitespace safely (strings and data URIs preserved) with a size-saved readout.
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