How do I compare two text files online?

Paste your two texts into ZapFile's Diff Checker side by side and it instantly highlights additions, deletions, and unchanged lines.

Can I compare code with Diff Checker?

Yes. ZapFile's Diff Checker works with any plain text including source code, configuration files, and documents.

Yes, all ZapFile tools are completely free with no hidden costs or subscriptions.

Absolutely. All processing happens directly in your browser. Your files are never uploaded to any server.

No. ZapFile requires no registration, login, or account creation.

Most tools work offline after the first load. ZapFile is a Progressive Web App you can install.

Yes! All tools are fully responsive and work on mobile devices.

Home/Tools/Diff Checker

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Compare two texts and highlight differences

Your files never leave your browser

Original Text

Modified Text

Runs on your device, not our servers

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