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Free document diff.

Compare two blocks of text and see exactly what changed - additions and deletions highlighted, line by line. Free, in your browser, no sign-up. From the team behind Sidenote, the AI reading assistant that cites every answer to the source.

Compared line by line, entirely in your browser - nothing is uploaded.

FAQ

Free document diff - common questions.

Yes: free and no sign-up. Paste two versions of your text, click Compare, and see every added and removed line highlighted.
No. The comparison runs entirely in your browser on your own device - your text never leaves your computer.
It compares the two texts line by line using a longest-common-subsequence diff, then shows added lines in green and removed lines in red, in order.
Yes: copy a unified diff (each line prefixed with +, − or a space) to paste into a document, email or ticket.
This tool compares two blocks of text you paste in. The Sidenote extension helps you read and question a single document - answering with citations to the exact source passage.
Embed this tool

Add Document Diff to your site - free.

Drop the free Document Diff straight into your site. Paste this snippet where you want it - please keep the attribution link.

<iframe src="https://getsidenote.app/embed/document-diff" title="Free Document Diff by Sidenote" width="100%" height="760" loading="lazy" style="max-width:760px;border:1px solid #ddd;border-radius:12px"></iframe>
<p style="font:13px/1.5 sans-serif;text-align:center;margin:8px 0">
  <a href="https://getsidenote.app/tools/document-diff">Free Document Diff</a> by <a href="https://getsidenote.app">Sidenote</a>
</p>
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