How is the diff computed?

We use a longest-common-subsequence style line comparison, with simple character highlighting inside changed lines.

Text Diff / Compare

Compare two texts line by line with highlights.

Paste an original and a revised version to see added, removed, and unchanged lines. Runs entirely in your browser.

Original

Modified

Diff

Illustrative sample — your real inputs may look different.

Line A
Line B-old
Line C
--- vs ---
Line A
Line B-new
Line C

Line B-old removed, Line B-new added (line-based diff with highlights)