Text Diff Checker
Compare two texts side-by-side and see exactly what changed. Highlights additions, deletions and modifications — all locally in your browser.
100% Local · Never Uploaded
Original Text
Modified Text
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Frequently Asked Questions
The tool uses a Longest Common Subsequence (LCS) algorithm to identify unchanged lines, then marks additions in green and deletions in red — the same approach used by Git.
Split view shows both texts side by side with changes highlighted inline. Unified view shows a single stream with + and − prefixes, similar to git diff output.
No hard limit — the comparison runs entirely in JavaScript. Very large texts may be slow due to LCS computational complexity, but typical code and document comparisons are instant.
Yes — click the Copy button in the Modified header of the results panel to copy the full modified text to your clipboard.