Paste original text on one side and the modified text on the other. The tool aligns the lines and highlights insertions, deletions and changes between them.
No — the comparison runs entirely in your browser, so your code and documents never leave your device.
Yes — paste any plain text including source code, JSON, YAML or logs to see a line-by-line difference.
By default whitespace differences are shown; trim your inputs first if you want to ignore leading or trailing spaces.