Text Diff Checker for Code Review

Why Paste Your Code Into Online Diff Tools?

Most online diff checkers send your code to their servers for processing. If you're reviewing proprietary code, API keys, or sensitive business logic, that's a security risk.

This diff checker runs entirely in your browser using a local implementation of the Myers diff algorithm. Paste two versions of your code, see additions (green) and deletions (red) highlighted inline or side-by-side, and never worry about your source code being logged on someone else's server.