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Load two DOCX documents, compare them, and see every difference as tracked changes — insertions, deletions, and formatting changes. Accept or reject each change individually, then export back to .docx.

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How it works

SuperDoc compares two documents at the paragraph level, detects what changed, and replays those changes onto the base document as tracked changes. The result looks exactly like a Word redline.
  1. Compare — Diff the document trees, comments, styles, and numbering
  2. Replay — Apply the differences as tracked changes with author attribution
  3. Review — Accept or reject each change using the standard Track Changes workflow

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Two paths

Client-side

Compare documents in the browser using editor commands. Best for interactive review UIs where users pick two files and see the redline immediately.

Server-side

Compare documents headlessly with the Node.js or Python SDK. Best for automation — CI pipelines, webhook handlers, or batch processing.

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What gets compared

Contentv1 support
Body text and formattingYes
CommentsYes
StylesYes
Numbering / listsYes
Headers and footersNot yet

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Output

The comparison produces a document based on the base document with all differences from the target surfaced as tracked changes. Comments, styles, and numbering changes are applied directly. Export the result as a .docx file and it opens in Microsoft Word with the tracked changes intact.

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Example

Diffing example

Side-by-side comparison demo with bidirectional tracked changes