Text Diff Checker
Paste two versions of any text and see additions, removals and matches highlighted line by line.
What is Text Diff Checker?
A text diff tool shows exactly what changed between two versions of a text: lines added, removed or modified. Same idea as the "diff" developers use, but in a simple interface — handy for reviewing contracts, comparing résumé versions, checking translations or spotting subtle edits in any document.
How to use
- Paste the original text in the first field.
- Paste the new text in the second field.
- See the side-by-side comparison with diffs highlighted.
- Green = added · Red = removed · Yellow = modified.
Frequently asked questions
How are differences computed?
We use a longest common subsequence (LCS) algorithm at the line level — the same approach used by Git diff.
Can I diff long texts?
Yes, but very long inputs may be slower because LCS is quadratic in line count.
Is my text uploaded?
No. The diff runs entirely in your browser — nothing is sent to a server.
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