CSS Tools

Minify CSS

Minify CSS — minify CSS to reduce file size for production. It runs entirely in your browser, so your data is never uploaded and it works fully offline.

Client-sideRuns entirely in your browser — your data never leaves your device.

Minify CSS is a browser-based web developer tool on WebDevToolsBase. Minify CSS — minify CSS to reduce file size for production. It runs entirely in your browser, so your data is never uploaded and it works fully offline. To use it, paste your input and view the result directly in your browser — no signup and nothing to install.

This tool minifies CSS syntax locally with CSS Tree 3.2.1. It preserves quoted text, calculation spacing and marked license comments, and leaves custom-property values intact. It does not compile SCSS or Sass, combine files, validate property values, or check browser support. Input is limited to 300,000 characters. Test the result in your actual page.

Minify CSS is a free CSS Tools utility that runs entirely in your browser — nothing you enter is uploaded.

CSS input
Minified CSS


 
How to use Minify CSS
 
     
  1. Paste the CSS you need to minify into the input box.
    2.  
  2. Minify CSS updates the output automatically as you type.
    3.  
  3. Finish by choosing Copy to take the output with you.
    4.  
 
About this tool
 
Minify CSS runs entirely in your browser. Minify CSS works on your stylesheet locally and returns the result instantly.
 
Modern CSS syntax is preserved so your selectors and values come back intact. It behaves the same on desktop and mobile, with nothing stored remotely.
 
Frequently asked questions
 
 
What is Minify CSS for?
Minify CSS lets you minify your input right in the browser, with the result shown instantly and nothing uploaded.
 
Does Minify CSS cost anything?
No — Minify CSS is completely free, with no sign-up and no hidden limits.
 
Is my input private in Minify CSS?
Yes — your input never leaves your device; Minify CSS does all the work in your browser.
 
Does Minify CSS support modern CSS syntax?
The CSS parser preserves supported syntax, strings and calculations. Property values and browser compatibility are not validated. SCSS and Sass are not compiled; unsupported syntax produces an error.
 
Can I use Minify CSS without a connection?
Yes — after the first load Minify CSS runs entirely offline.
 
 
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