It scans your CSS code and removes outdated browser‑specific prefixes (-webkit-, -moz-, -ms-, -o-) from property names and at-rules, leaving clean standard syntax behind. For example, -webkit-border-radius becomes border-radius.

Modern browsers support the standard properties fully. Keeping old prefixes bloats your stylesheets, makes maintenance harder, and can confuse new developers. Removing them reduces file size and helps you stick to current web standards.

The tool strips prefixes from CSS properties and at-rules that begin with -webkit-, -moz-, -ms-, and -o-. It also converts prefixed at-rules such as @-webkit-keyframes to @keyframes, @-moz-document to @document, etc.

This version focuses on property/rule prefixes and does not automatically convert legacy value functions. For complex cases (e.g., flexbox, gradients), manual review is recommended. The conservative mode (uncheck “Remove all prefixes”) helps preserve some necessary legacy declarations.

Yes, in most cases. We advise you to test the cleaned CSS across your target browsers. Unsupported very old browsers may require some prefixes, but for modern web development, the output is safe and clean.

Autoprefixer adds prefixes based on browser support data — this tool removes them. Use Autoprefixer when you write pure CSS and want to support older browsers; use our prefix remover when you inherit legacy code and want to modernize it.