Free Online CSS Minifier
Remove comments, whitespace and line breaks from your CSS. Free, and it runs in your browser.
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What Is CSS Minification?
CSS minification removes characters that browsers do not need to apply your styles: comments, extra spaces and line breaks. The styles work the same, but the file is smaller, so it downloads faster, which helps most on slow mobile networks. Use it on production files and keep your original, readable source.
Working on the rest of your page? Try the HTML Minifier and the JavaScript Minifier.
How to Use the CSS Minifier
- Paste your CSS into the Original Code box.
- Click Minify Now.
- Check the Minified Code box. It shows the size saved.
- Click Copy Minified or Download File.
Is My CSS Private?
The minifier runs in your browser using JavaScript, and your code is not sent to our server. Still, avoid pasting API keys, passwords or other secrets into any online tool.
CSS Minifier Example
Before:
/* Card styles */
.card {
margin: 0 auto;
padding: 16px 24px;
color: #333333;
}After (typical output):
.card{margin:0 auto;padding:16px 24px;color:#333333}Things to Check After Minifying
| Item | Why it matters |
|---|---|
calc() | Spaces around + and - inside calc() are required. calc(1px+2px) is invalid. |
| License comments | Comments like /*! ... */ are often meant to be kept. Check if your license needs them. |
@import and @charset | Their position in the file matters. Make sure the order is unchanged. |
| Browser test | Open your page after replacing the file to confirm that the layout looks the same. |
Frequently Asked Questions
1. What does the CSS Minifier do?
It removes comments, extra spaces and line breaks from your CSS to reduce the file size.
2. Will minifying break my CSS?
Usually not. Still, check special cases such as spaces inside calc(), license comments and the order of @import. Test your page after minifying and keep your original file.
3. Is my code private?
The tool runs in your browser and does not send your code to our server. It is free, and you do not need to sign up.
4. Can I get my original formatting back?
Not fully. Minifying removes comments and spacing. Keep your original source file and minify only the production copy.
5. Does minifying CSS make my site faster?
A smaller file downloads faster, especially on slow connections. The saving depends on how many comments and spaces your file has. For the best result, also use gzip or Brotli compression and browser caching.