Minify CSS
Compress and minify CSS by removing comments and whitespace. Shrink your stylesheet and see exactly how many bytes you save.
Free, no signup — the output is always valid, functionally identical CSS.
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How to Minify CSS Online
Turn a formatted stylesheet into a compact, production-ready file in three steps.
Paste Your CSS
Drop in a formatted stylesheet, component styles, or a full CSS file.
Minify
Click Minify CSS to strip comments and whitespace. You'll see original size, minified size, and bytes saved.
Copy or Download
Copy the compact CSS to your clipboard or download it as a .css file.
/* before */
.header {
color: red;
margin: 0 auto;
}/* after */
.header{color:red;margin:0 auto}
Size Stats
See original size, minified size, bytes saved, and reduction percentage after every minification.
Behavior Preserved
Only comments and whitespace are removed. Selectors, values, and media queries stay intact.
Instant Results
Minification happens instantly. Copy to clipboard or download as a .css file.
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Frequently Asked Questions
What does the Minify CSS tool do?
It strips comments, extra whitespace, and unnecessary spacing around CSS syntax to produce the smallest possible valid stylesheet — ideal for production builds.
How much can it reduce my CSS file size?
Results vary based on formatting, but typical hand-written CSS shrinks by 20-40%. The tool shows exact original size, minified size, and bytes saved.
Does minifying change how my CSS behaves?
No. Only comments and whitespace are removed. Selectors, properties, values, media queries, and nesting all stay functionally identical.
Is my CSS kept private?
Yes. Minification happens on request and nothing is stored, so it's safe to use with proprietary stylesheets.
How do I minify CSS without npm, webpack, or a build step?
Paste the stylesheet here and click Minify. Nothing to install and no command line — copy the compact output or download it as a .css file and upload that to your server.
Does minifying CSS actually improve page speed?
Yes, though modestly once gzip or brotli is in play. Smaller CSS means fewer bytes to download and less to parse before first paint, which helps Largest Contentful Paint on slow connections. It is one of the easiest PageSpeed Insights warnings to clear.
Will minifying break my styles?
No. Only comments and whitespace go. Selectors, properties, values, media queries, keyframes, and custom properties are all left exactly as written, so the rendered result is identical.
How do I minify CSS for a WordPress theme?
Copy the contents of your theme's style.css or child-theme stylesheet, minify it here, then paste the result back as a separate minified file and enqueue that in production. Keep the original formatted file for editing.
Can I unminify CSS later?
You can reformat it. Run the minified output through our CSS Formatter to get indentation and line breaks back. Comments cannot be recovered once removed, so keep your source file.
Is this free to use?
Yes. Minify CSS is completely free with no signup, no login, and no limits.
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