Remove Unused CSS - Online CSS Purger & Cleaner | ToolBox

?? Remove Unused CSS

Analyze HTML content and automatically remove unused CSS rules to reduce file size and speed up rendering

?? HTML Content 0 B
?? CSS Input 0 B
? Cleaned CSS 0 B

How to Use

  1. Paste your HTML code in the left input area.
  2. Paste the corresponding CSS code in the right input area.
  3. Add any dynamically loaded class names to the whitelist to prevent accidental removal.
  4. Click "Clean CSS" to analyze, then copy or download the cleaned CSS.

Frequently Asked Questions

Will it accidentally remove CSS classes added by JavaScript?

The tool only analyzes class names present in the HTML you paste. Classes dynamically added by JavaScript won't appear in static HTML and may be removed. Use the Whitelist feature to protect these dynamic class names from deletion.

Does it support SCSS / LESS preprocessors?

This tool processes standard CSS only. If you use SCSS or LESS, compile them to standard CSS first before using this tool. The compiled CSS files can be analyzed and cleaned normally.

Will it lag with large CSS files?

All processing runs in your browser, so performance depends on your device and file size. Files up to a few hundred KB are processed quickly. We recommend keeping individual CSS files under 1MB. For larger files, try processing in segments.