Free CSS Minifier

Shrink your stylesheets for production in one click. This free CSS minifier strips comments, collapses whitespace, and removes redundant characters — safely, without touching strings or data URIs — then shows exactly how many bytes you saved.

Minified CSS


    

    

  



  
Private by design. This tool runs 100% in your browser — your code is never uploaded to any server.

  

    
How to Use the CSS Minifier

    
    
      
  1. Paste your formatted CSS into the input box.
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  2. Click Minify CSS — the compressed output appears instantly.
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  3. Check the savings report for before/after sizes.
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  4. Copy or download the minified .css file for production.
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Features

    
The minifier is string-aware: quoted content, url() values, and data URIs pass through untouched while comments, newlines, and redundant spaces are removed. It strips the optional semicolon before closing braces, collapses zero values safely, and reports original size, minified size, and percentage saved so the win is measurable.

    
Benefits & Use Cases

    
Smaller CSS means faster first paint — every kilobyte counts on mobile networks. Developers minify before deploying, compare savings across builds, and keep the readable source in version control while shipping the compressed file. Local processing keeps proprietary stylesheets off third-party servers.

    
Tips

    
Always keep your formatted source file and minify as a build step — never edit the minified output directly. Pair with gzip/Brotli on your server: minification plus compression typically cuts CSS to a fraction of its original size.

  

  

    
Frequently Asked Questions

    
What does CSS minification do?
It removes everything unnecessary for the browser — comments, whitespace, line breaks, and redundant characters — producing a functionally identical stylesheet that downloads and parses faster.

    
Will minification break my styles?
No. A correct minifier only removes characters that do not affect rendering. This tool protects strings, URLs, and data URIs, so content like content: "; " stays intact.

    
How much smaller will my CSS get?
Typically 20–40% smaller depending on how the source was written. Heavily commented, generously spaced stylesheets shrink the most. The tool shows your exact savings.

    
Should I minify CSS myself or use a build tool?
For production pipelines, automate minification with a build tool. For quick one-off files, pasting here is faster than setting up tooling.

    
Is my CSS uploaded to a server?
No. Minification runs entirely in your browser — your stylesheet never leaves your device.

  

  

    
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