CSS Prefixer – Add Vendor Prefixes for Cross-Browser CSS

Free online CSS prefixer tool to add vendor prefixes (-webkit-, -moz-, etc.) automatically. Ensure your stylesheets work across all browsers. No signup required. Mobile-friendly.

Input Section

Add valid CSS
Select a valid CSS File
Max file size: 5MB
Enter a valid CSS URL

Output Section

Original Size:
Processed Size:
Change: