Install Sidenote
Free tool

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>
Ready when you are

Stop digging. Start asking.

Add Sidenote to your browser, open any page in your wiki, and ask it the question you’ve been Slacking the team about.

Install Sidenote (free)See the citation demo

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