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Paste your original text on the left and the changed version on the right — the differences appear below as a unified diff the moment you stop typing. Removed lines are marked - (red), added lines + (green), and unchanged context lines keep a leading space, exactly like git diff. Turn on Ignore whitespace or Ignore case to hide changes you don't care about. Everything runs locally in your browser.
No. The comparison runs entirely in your browser with JavaScript — the two texts are never sent to a server, so the tool works offline and is safe for private code, logs, and documents.
A line-based diff computed with Myers' shortest-edit algorithm — the same approach Git uses — presented as a unified diff with hunks and surrounding context. The output is a valid patch you can copy and apply with patch or git apply.
Ignore whitespace collapses runs of spaces and tabs and trims each line before comparing, so re-indentation or trailing-space changes don't show up. Ignore case compares letters case-insensitively. Both only affect the comparison — the diff still displays your original text exactly.
Yes — it compares any text line by line, so it works for JSON, YAML, CSV, source code, logs, or prose. For structural JSON comparison, format both sides first (with the JSON formatter, optionally sorting keys) so the diff lines up cleanly.
Very large inputs (thousands of differing lines) fall back to a coarse whole-block diff to stay fast and within memory — you'll see a note when that happens. Typical files, configs, and snippets get a full, precise diff.