Developer Tools
CSS Minifier
FreeNo SignupPrivate — runs in your browser
Minify CSS stylesheets online for free. Remove whitespace, comments, and redundant rules to optimize your CSS for production. No signup required.
What is CSS Minifier?
CSS files can contain significant amounts of whitespace, comments, and formatting that browsers don't need. Our free CSS Minifier compresses your stylesheets by removing all unnecessary characters while preserving functionality. Reduce your CSS file size for faster page loads and improved Core Web Vitals.
How to Use CSS Minifier
- 1Paste your CSS code
- 2Click Minify
- 3See the compressed output with size reduction stats
- 4Copy the minified CSS
Key Features & Benefits
Smart removal of whitespace and comments
Preserves all CSS functionality
Shows before/after file size comparison
Handles modern CSS features safely
Frequently Asked Questions
What does CSS minification do?
It removes whitespace, comments, and unnecessary semicolons/brackets to produce the smallest CSS possible.
Will it break my styles?
No, minification only removes characters that don't affect rendering. Your styles will work identically.
What about CSS variables and modern features?
The minifier safely handles CSS custom properties, @layer, nesting, and all modern CSS features.