Text Diff Checker
Compare two blocks of text and highlight differences line by line.
Paste two blocks of text and see exactly what changed. The diff highlights added, removed and unchanged lines side-by-side, similar to git diff but in your browser. Useful for proofreading, contract reviews and code comparisons.
Common use cases
- Compare contract or policy revisions before signing
- Spot proofreading edits between draft and final article versions
- Review code snippets without setting up a git repository
- Compare configuration files (.env, YAML, JSON) across environments
Frequently asked questions
Is my text uploaded anywhere?▾
No. The comparison runs entirely in your browser — nothing is sent to a server.
What algorithm does it use?▾
A standard longest-common-subsequence (LCS) line diff, which is the same family of algorithm Git and most diff tools use.
Can I diff two large files?▾
Yes — comfortably up to ~1 MB per side. For bigger comparisons, use a desktop tool like meld or VS Code's built-in diff.
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