Diff Checker — Compare Text Online
Free diff checker. Compare two texts side-by-side and find additions, deletions, and changes instantly.
Original
Changed
🔒100% Private — Your files never leave your device. All processing runs locally in your browser.
How It Works
Paste your original text on the left and the changed version on the right. Click Compare to see a unified diff with additions (green) and deletions (red) highlighted.
The tool performs a line-by-line comparison using a standard diff algorithm. It identifies the minimum set of changes needed to transform the original text into the modified version, making it easy to review edits in code, documents, or configuration files.
Features
- ✓Side-by-side input panes
- ✓Unified diff output with color coding
- ✓Green highlights for additions, red for deletions
- ✓Line-by-line comparison with line numbers
- ✓Statistics: lines added, removed, and unchanged
- ✓Handles large texts with thousands of lines
⚡Uses the same diff algorithm as Git and Unix diff utilities.
Perfect For
- →Developers comparing code versions before and after changes without access to Git
- →Writers and editors tracking document revisions by comparing drafts
- →DevOps engineers comparing configuration file versions to identify differences
- →QA testers comparing API responses between environments
Frequently Asked Questions
Yes, 100% free.