Paste or drop two versions of a text and Contrast shows what changed — removed lines in red, added lines in green, with the exact words that differ highlighted inside each changed line. Switch between a stacked (unified) view and side-by-side. Everything runs in this tab; your text never leaves your device.

Original— type, paste, or drop a file

Changed— type, paste, or drop a file

Ignore whitespace Ignore case

Contrast compares plain text line by line using a longest-common-subsequence match, the same core method as the classic diff tool. Best for notes, code, config, CSV, and prose. It doesn't parse binary files, and very large inputs are matched with a size guard to stay responsive.