Text Diff Checker
Compare two blocks of text line by line and see additions and deletions highlighted in green and red. Runs entirely in your browser.
Pure browser JavaScript (LCS algorithm) — no libraries required.
How to use this tool
- Paste the original text on the left.
- Paste the modified text on the right.
- Click Show Diff to see added and removed lines.
Compare two blocks of text line by line and see additions and deletions highlighted in green and red. Runs entirely in your browser.
Frequently asked questions
- Is my text sent to a server?
- No — the diff is computed locally in your browser using a standard LCS algorithm.