Diff Checker

Paste two versions of a file, a config or a paragraph and see exactly what changed, line by line, with additions and removals highlighted.

• Side-by-side comparison with highlighted changes
• Works on prose, code, config files and logs
• Nothing is uploaded, so it is safe for private files

Can I compare two config files?

Yes. Paste each version into one side; the differences are highlighted line by line.

Is there a size limit?

The comparison runs in your browser, so the practical limit is your machine's memory rather than an upload cap.

Diff Checker runs in your browser, so there is no server call for it. API docs covers the tools you can call from code.