Text Diff Checker
Compare two texts online for free and highlight the differences line by line — additions in green, deletions in red. Runs entirely in your browser.
100% private — runs entirely in your browser. Your files never leave your device.
Compares line by line using a longest-common-subsequence diff: removed lines are red, added lines are green, unchanged lines are shown as context. Everything runs in your browser — nothing is uploaded.
How to use the Text Diff Checker
- Paste the original text on the left.
- Paste the changed text on the right.
- Click Compare.
- Review the additions (green) and deletions (red).
What you can use it for
- Compare two drafts or versions
- Spot changes in code, config or lists
- Review edits before accepting them
- Check what changed between two files
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Browse all free tools →Frequently asked questions
How does the comparison work?
It uses a longest-common-subsequence diff to align the two texts, then marks removed lines in red and added lines in green with unchanged lines as context.
Is it line-by-line or word-by-word?
Line by line — ideal for comparing drafts, code, config files and lists.
Is my text private?
Yes — the comparison runs entirely in your browser; nothing is uploaded.
What if the texts are identical?
The tool tells you they match and shows no changes.