The Lab · Tool

Text Diff

Paste two blocks of text or code and see exactly what changed — line by line, additions in green and removals in red. The text never leaves your browser.

✓Runs in your browser
✓Nothing uploaded
✓No sign-up
✓Open source

Compare

Original

Changed

Difference

Paste text into both panes to see the difference.

A line-level diff (longest-common-subsequence): unchanged lines are shown as context, removals in red, additions in green. “Copy diff” gives you a git-style unified text with +/− prefixes. Everything runs locally — paste secrets or private code without it leaving the tab.