Prefix Cleaner

Prefix Cleaner

CSS prefix remover online. Remove vendor prefixes (-webkit-, -moz-, -ms-, -o-). Clean up CSS autoprefixer output—free tool.

Input CSS (with prefixes)

Cleaned CSS

Cleaned CSS will appear here...

⚠️ When to keep prefixes

  • Supporting older browsers (IE, old Safari)
  • Using cutting-edge CSS features
  • Production code for high compatibility

Features

  • Remove unnecessary vendor prefixes (-webkit-, -moz-, -ms-)
  • Identify obsolete properties
  • Modernize legacy CSS
  • Bulk processing
  • Preserve necessary prefixes (optional)
  • Clean up copy-pasted code

Common Use Cases

  • Clean up code from old generators
  • Modernize 5+ year old CSS projects
  • Reduce file size by removing dead code
  • Fix validation errors caused by unknown properties
  • Prepare code for Autoprefixer

Vendor Prefixes

Vendor prefixes (e.g., -webkit-border-radius) were used by browsers to experiment with new CSS features before they became standard. Today, most modern browsers support standard properties, making many prefixes obsolete.

Common Prefixes:

  • -webkit-: Chrome, Safari, newer Edge, Opera, iOS, Android
  • -moz-: Firefox
  • -o-: Old Opera
  • -ms-: Internet Explorer, old Edge

Why Clean Them? Keeping old prefixes bloats code and can sometimes cause unexpected behavior if the prefixed implementation differs from the standard one. It's best to write standard CSS and let a tool like Autoprefixer handle adding necessary prefixes for your target browsers.

Examples

Valid - Dirty Input
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
Valid - Clean Output
border-radius: 5px;

Frequently Asked Questions

Should I remove ALL prefixes?
Not necessarily. Some cutting-edge features still require prefixes (like `-webkit-background-clip: text` or scrollbar styling). This tool targets *obsolete* prefixes for standard properties like border-radius, box-shadow, Flexbox, etc.
How do I know which prefixes are needed?
The best practice is to write standard CSS and use a build tool plugin called "Autoprefixer" which checks "Can I Use" data to automatically add only the prefixes needed for the browsers you want to support.
Why does -webkit- still exist?
Because of Chrome/Safari dominance, many sites relied on `-webkit-` properties. Even non-WebKit browsers sometimes implement `-webkit-` aliases for compatibility!

💡 Tips

  • Don't manually write prefixes anymore. Use standard CSS and a post-processor.
  • If copying code from old tutorials (pre-2015), run it through this cleaner first.

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