Free CSS Minifier Online

Compress and optimize your CSS code instantly. Remove whitespace, comments, and optimize colors for faster page loads.

Compress Optimize 100% Client-side Secure Free Forever
Original CSS 0 B
Minified CSS 0 B
Minification Settings

How to Use the CSS Minifier

Compressing your CSS files is quick and easy with our free online CSS minifier. Follow these simple steps:

  1. Paste or upload your CSS - Copy your stylesheet code and paste it into the input field, or drag and drop a .css file directly onto the editor.
  2. Configure minification options - Choose which optimizations to apply: remove comments, remove whitespace, compress colors (#ffffff → #fff), optimize units (0px → 0), and remove trailing semicolons.
  3. Click "Minify CSS" - The minifier will process your code and display the compressed result with size reduction statistics.
  4. Copy or download - Click "Copy" to copy the minified CSS to your clipboard, or "Download" to save it as a .css file.
Privacy Guaranteed: All CSS minification happens 100% in your browser. Your code is never uploaded to any server - we can't see or store your stylesheets.

What is CSS Minification?

CSS Minification is the process of removing unnecessary characters from CSS code without changing its functionality. This includes removing whitespace, line breaks, comments, and optimizing values like colors and units. The result is a smaller file that loads faster, improving your website's performance and user experience.

What Gets Removed
  • Whitespace - Spaces, tabs, and line breaks
  • Comments - /* ... */ comment blocks
  • Trailing semicolons - The last ; before }
  • Redundant zeros - 0.5 → .5
  • Unnecessary quotes - In font names and URLs
What Gets Optimized
  • Colors - #ffffff → #fff, #aabbcc → #abc
  • Units - 0px → 0, 0em → 0
  • Shorthand - margin: 0 0 0 0 → margin: 0
  • Font weights - bold → 700
  • Duplicate properties - Removed safely

Benefits of Minifying CSS

CSS minification is an essential optimization technique for any website. Here's why developers and website owners use CSS compressors:

Faster Page Load

Smaller CSS files download faster, reducing page load time and improving user experience.

Better Core Web Vitals

Optimized CSS improves FCP, LCP, and CLS scores - critical for Google ranking.

Reduced Bandwidth

Save server bandwidth and reduce hosting costs with smaller file transfers.

Frequently Asked Questions About CSS Minification

No, absolutely not. CSS minification only removes unnecessary characters like whitespace, comments, and line breaks. The browser interprets minified CSS exactly the same way as the original - your styles will work identically. This is purely a file size optimization.

Typical CSS minification reduces file size by 20-40%, sometimes more for heavily commented or poorly formatted code. The exact reduction depends on your original CSS - files with lots of comments and whitespace see the biggest savings. Combined with Gzip compression, you can see 70-80% total reduction.

Yes, completely secure! Our CSS minifier processes everything 100% client-side in your browser using JavaScript. Your stylesheets are never uploaded to any server - we can't see, store, or access your code. This makes it safe to use with proprietary CSS.

Yes, always! Keep your original, readable CSS for development and future edits. Use minified CSS only for production. Most build tools (Webpack, Gulp, Vite) can automatically minify CSS during the build process while preserving source files.

Minification removes unnecessary characters from the source code itself, creating a smaller but still readable file. Compression (like Gzip or Brotli) is server-side encoding that compresses the already-minified file for transfer. For best results, use both: minify your CSS, then enable Gzip compression on your server.

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