CSS Minifier & Beautifier
Compress CSS for production or Beautify for readability (100% Client-side)
CSS Minifier & Beautifier Documentation
What is this tool?
This tool allows you to compress (minify) or beautify CSS code. Minification removes unnecessary whitespace, comments, and redundant characters to reduce file size for production deployment. Beautification formats CSS with proper indentation and line breaks for better readability during development.
Key Features
- Minify CSS - Remove whitespace, line breaks, and comments to reduce file size
- Beautify CSS - Format CSS with proper indentation and line breaks for readability
- Customizable indent size (2 spaces, 4 spaces, or tabs)
- Option to preserve comments during minification
- File size comparison showing compression ratio
Common Use Cases
- Optimize CSS files for production deployment to reduce page load time
- Format minified or compressed CSS for easier debugging and code review
- Clean up CSS code with inconsistent formatting
- Reduce bandwidth usage by serving minified CSS to users
How This Tool Processes CSS
Whitespace Removal
Removes all unnecessary spaces, line breaks, and tabs. CSS rules are condensed to a single line without affecting functionality. Example: `.btn { color: red; }` becomes `.btn{color:red;}`
Comment Stripping
Deletes all CSS comments (/* ... */) unless 'Preserve Comments' option is enabled. Important license comments using /*! ... */ syntax are typically preserved by most minifiers.
Redundant Character Removal
Eliminates unnecessary semicolons (last property in a rule), spaces around operators, and extra zeros (0.5 → .5). Shortens color codes (#ffffff → #fff).
Property Optimization
Removes spaces around braces, colons, and commas. Example: `margin: 10px 20px;` becomes `margin:10px 20px;`. Note: spaces are preserved in calc() and other functions where required.
File Size Impact
CSS minification typically achieves 20-50% file size reduction depending on the original code's formatting and comment density. Combined with server-side Gzip compression, total reduction can exceed 80%.
| Scenario | Original | Minified | Reduction | Gzipped |
|---|---|---|---|---|
| Well-formatted CSS with comments | 50 KB | 25-30 KB | 40-50% | ~5-8 KB (85-90% total) |
| Already compact CSS with few comments | 30 KB | 24-27 KB | 10-20% | ~4-6 KB (80-85% total) |
| Heavily commented documentation CSS | 100 KB | 40-50 KB | 50-60% | ~8-12 KB (88-92% total) |
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