Compare two texts and highlight the differences
🔒 Your text is processed locally
Spotting what changed between two versions of a document is hard to do by eye, especially when the edits are small. This tool lines the two texts up and marks the differences for you. It's useful for checking an editor's revisions to your draft, seeing what moved in an updated contract or policy, confirming what a rewrite actually changed, or comparing two versions of a config file.
Your text is processed entirely inside your browser. Nothing is sent to a server, so contracts, drafts, and internal documents stay on your own device.
Which text goes on which side matters for how the result reads. Put the earlier version on the left and the newer one on the right, and the highlights describe what the revision did — this was removed, that was added. Swap them and the same edits are described backwards, which is confusing when you're trying to review changes.
A comparison is also easier to read when the two texts are formatted the same way. If one version came from a word processor and the other from a plain-text editor, differences in line breaks and spacing can show up as changes even when the wording is identical. Pasting both through the same source, or tidying the line breaks first, gives a much cleaner result.
Usually a formatting mismatch — different line breaks, indentation, or invisible characters carried over from another program. Normalising the spacing in both texts first will narrow the result down to real edits.
The original, older version. The right side is the revision, so the highlights read as what the newer version changed.
Yes, for short snippets and config files it works fine. For tracking changes across a codebase, a version control tool will serve you better.
No. The comparison runs locally in your browser, so nothing you paste ever leaves your device.