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Text Diff Checker
Paste an original and a changed version to get a clean, color-coded line diff computed with a longest-common-subsequence algorithm. Added lines are green, removed lines red, with running totals.
Original
Changed
+2 added−1 removed
🔒 This tool runs entirely in your browser. Your data is never uploaded.
Frequently asked questions
How does the comparison work?＋
It compares the two texts line by line and highlights additions and removals, so you can see exactly what changed.
Is it good for code or prose?＋
Both — any plain text works. For very large files, your editor's built-in diff may be faster.
Is my text uploaded?＋
No — the diff is computed locally in your browser.