Developer
CSS Minifier
- Browser-based
- No signup
Dedicated CSS compression for production. Paste a stylesheet, copy the minified output, and review before-and-after byte counts. Comments and extra spaces are removed while rule order and selectors are preserved.
100% Client-Side
Your data never leaves your computer.
How to use this tool
Paste CSS into the input editor. Minified output updates as you type. Use the Format button to switch to readable indentation, then copy the compact stylesheet for production.
Worked example
Example: `.header { color: #111; /* brand */ padding: 1rem; }` minifies to `.header{color:#111;padding:1rem}`—about 40% smaller for this snippet, with comments removed.
How it works
Opens the CSS Formatter in minify mode. Removes block comments and collapses whitespace around braces, colons, semicolons, and commas while preserving rule order and selectors.
Limitations
Whitespace and comment removal only—no color shortening, selector merging, or unused-rule removal. Use CSS Formatter and Minifier to pretty-print and minify in one tool.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Frequently asked questions
How is this different from CSS Formatter and Minifier?
CSS Minifier focuses on compression only—it removes comments and whitespace and shows how many bytes you saved. The combined formatter also lets you pretty-print CSS in the same panel.
Does it optimize CSS values or merge rules?
No. It compresses whitespace and strips comments. It does not shorten colors, remove unused selectors, or run advanced optimizations.
Is my CSS stored?
No. Minification runs entirely in your browser.
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