Text Diff

Compare two blocks of text line by line and see exactly what was added or removed.

How to use

Paste the original text on the left and the changed text on the right, then press Compare. Removed lines are marked with a minus and added lines with a plus, each with its line number.

FAQ

The comparison uses a longest-common-subsequence table, so unchanged lines are matched even when insertions shift everything below them. Each side is limited to 2000 lines to keep the table small.

Privacy: every calculation runs inside your browser. Your files and text never leave your device.