CSS Minifier
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About the CSS Minifier
The CSS Minifier strips out the whitespace, comments, and unnecessary characters from your stylesheet, producing a smaller file that loads faster. Same styles, fewer bytes — a simple performance win for any website.
Every kilobyte counts for page speed, and source CSS is full of formatting that browsers don’t need. Minifying shrinks the file so it downloads quicker, which improves load times and can help with performance scores.
Minification runs in your browser, so your code never leaves your device. There’s no upload or account; paste your CSS and copy back the minified version instantly.
How to use the CSS Minifier
- Paste your CSS into the input area.
- Run the minifier to remove whitespace and comments.
- Review the minified output and the size reduction.
- Copy the minified CSS.
- Use it in production in place of the source file.
Common use cases
- Shrinking a stylesheet to speed up page loads.
- Preparing CSS for production deployment.
- Reducing file size to improve performance scores.
- Cleaning out comments and whitespace before shipping.
Frequently asked questions
Does minifying change how my styles work?
No. Minification only removes characters browsers ignore — whitespace and comments — so the visual result is identical while the file is smaller.
Should I keep the original CSS?
Yes. Keep your readable source for editing and use the minified version in production, since minified code is hard to maintain by hand.
How much smaller will my file get?
Savings vary with how much whitespace and commenting the source has, but minification commonly trims a meaningful percentage off the file size.
Is my code uploaded anywhere?
No. Minification happens in your browser, so your CSS never leaves your device.
Can I minify HTML and JavaScript too?
Yes. Use the HTML Minifier and JavaScript Minifier for those file types.