Paste two versions of any text and see them compared column by column with added, removed, and unchanged lines clearly marked. Useful for proofreading edits, reviewing translations, and checking config differences. All processing runs in your browser.
The diff algorithm runs in a Web Worker inside your browser, so the page stays responsive even for large files. All processing runs locally.
All diffing is done locally using browser APIs. Our servers are not involved at any point.
For making the same change everywhere in one file, try find and replace. To put both inputs in matching order before comparing, use sort lines. For diffing two JSON payloads after pretty-printing, see the JSON formatter.