Text Diff Checker
Compare two texts and highlight every added and removed line
Paste an original and a changed version, then press Compare to get a line-by-line diff computed with a standard LCS algorithm. Added lines are tinted green with a plus gutter, removed lines red with a minus, and you can copy the result as a unified diff in one click. It runs entirely in your browser, with no login or backend, and nothing is ever uploaded.
Enter text in both boxes and press Compare to see a line-by-line diff.
Tip: the diff is computed in your browser with a standard LCS algorithm, nothing is uploaded or sent anywhere. It works line by line, so reordered or edited lines show up as added and removed.
