Formatters & Cleaners

CSS Cleaner

Beautify messy CSS or minify it for production — instantly, in your browser, with nothing uploaded.

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

CSS Cleaner is a browser-based web developer tool on WebDevToolsBase. Beautify messy CSS or minify it for production — instantly, in your browser, with nothing uploaded. 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.

CSS Cleaner is a free Formatters & Cleaners utility that runs entirely in your browser — nothing you enter is uploaded.

Input
Output






 
How to use CSS Cleaner
 
     
  1. Start by adding the CSS you want to format into CSS Cleaner.
    2.  
  2. Adjust the Mode option to match what you need.
    3.  
  3. Hit Clean CSS — the formatted output appears below at once.
    4.  
  4. Use Copy to keep or reuse the result.
    5.  
 
About this tool
 
CSS Cleaner runs entirely in your browser. CSS Cleaner processes CSS in your browser, applying the transformation to the styles you paste without altering their meaning.
 
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 CSS Cleaner for?
Use CSS Cleaner to format your input without installing anything using the Mode control; everything happens client-side.
 
Do I need an account for CSS Cleaner?
No — CSS Cleaner needs no account, sign-up or installation.
 
Is my input private in CSS Cleaner?
Yes — your input never leaves your device; CSS Cleaner does all the work in your browser.
 
Does CSS Cleaner 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 CSS Cleaner without a connection?
Yes — after the first load CSS Cleaner runs entirely offline.
 
 
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