About TextCompare

TextCompare is a free text comparison tool built for developers, writers, editors, and anyone who needs to find differences between two texts quickly and privately.

Privacy First

Every text comparison happens entirely in your browser. We use Web Workers to run the diff algorithm off the main thread, ensuring your UI stays responsive while processing even the largest files. No text data is ever sent to a server, stored in a database, or tracked in any way.

Built for Performance

TextCompare is designed to handle large files efficiently. Our architecture includes Web Workers for off-thread computation, virtualized rendering with react-window for displaying only visible lines, and code splitting to minimize initial page load. The result is a tool that stays fast whether you're comparing 10 lines or 100,000.

Features

• Line-by-line, word-by-word, and character-level comparison
• Unified and side-by-side diff views
• Word-level inline highlighting within changed lines
• Copy diff to clipboard or download as a patch file
• Dark mode support
• Responsive design for mobile and desktop
• No sign-up required, completely free to use