How to Combine Multiple Word Documents With Different Revision Sets

You need to merge several Word documents that each contain separate tracked changes from different reviewers. The default copy-and-paste method loses revision marks or creates conflicting edits that are hard to review. Word provides a built-in feature called Combine Documents that merges the content and preserves each author’s tracked changes as distinct revision sets. This article explains how to use the Combine feature correctly, what happens to formatting and comments during the merge, and what to do when the combined document shows unexpected behavior.

How the Combine Feature Preserves Separate Revision Sets

The Combine feature in Word is designed for scenarios where two people have edited the same base document independently. Unlike copy and paste, which discards revision metadata, Combine reads the tracked changes from each document and labels them with the original author name. Each set of revisions remains editable in the merged document, so you can accept or reject changes from each reviewer separately.

To use Combine successfully, you need two documents that share the same origin — for example, a master document sent to two reviewers who each made their own tracked changes. If the documents do not share a common ancestor, Combine treats all content as an insertion, which defeats the purpose. You also need both documents to be saved in .docx format; the feature does not work with .doc or .rtf files.

Steps to Combine Two Documents With Different Revision Sets

Follow these steps to merge two documents while preserving each reviewer’s tracked changes. The process works identically in Word for Microsoft 365, Word 2021, Word 2019, and Word 2016 on Windows and Mac.

1. Open the first or original document
   Launch Word and open the document that represents the starting version before changes were made. This document will serve as the baseline for the merge.
2. Go to Review > Compare > Combine
   Click the Review tab on the ribbon. In the Compare group, click Compare and then select Combine from the dropdown menu. The Combine Documents dialog box opens.
3. Select the Original document and the Revised document
   In the Original document field, click the folder icon and browse to the document that contains the baseline text. In the Revised document field, select the document that contains the tracked changes you want to merge in. The revised document’s changes will be applied on top of the original.
4. Choose the merge target
   In the Show changes in section, select New document. This option creates a fresh document containing the merged result, leaving your original files untouched. Do not choose Original document or Revised document because those options overwrite the source files.
5. Set comparison options
   Click the More button in the Combine Documents dialog. Review the settings under Comparison settings. By default, Word compares text, formatting, comments, and headers. Uncheck any category you do not want to track, such as Formatting if you only care about content changes.
6. Click OK and review the merged document
   Word creates a new document with the combined content. The Reviewing pane shows all tracked changes from both documents, labeled with each reviewer’s name. Use the Review tab to accept or reject changes individually or in bulk.

Combining More Than Two Documents

Word’s Combine dialog only merges two documents at a time. To combine three or more versions, repeat the process incrementally. Start by combining the original document with the first revised document. Then use the resulting merged document as the new original and combine it with the next revised document. Each iteration preserves the revision sets from all previous merges.

Common Problems When Combining Revision Sets

All Changes Appear as Insertions With No Author Name

This happens when the two documents do not share a common base. Word cannot detect what was deleted or moved, so it treats everything in the revised document as new text. To avoid this, always start from the same original document. If you already lost the base document, use the Combine feature anyway, but expect to manually review every insertion.

Comments From One Reviewer Are Missing in the Merged Document

Word combines comments only if they are attached to text that exists in both documents. If a reviewer added a comment to a paragraph that was deleted in the other version, the comment may be lost. To preserve all comments, ensure that the Comments checkbox is checked in the comparison settings. After merging, check the Reviewing pane for orphaned comments.

Formatting Conflicts Between the Two Documents

When both documents use different styles for the same element, Word marks the formatting difference as a tracked change. This can clutter the revision list. To suppress formatting tracking during the merge, open the Combine dialog, click More, and uncheck Formatting. After the merge, apply a consistent style set to the entire document.

Combine Documents vs Compare Documents: Key Differences

Item	Combine Documents	Compare Documents
Purpose	Merge two versions of the same document that were edited independently	Show differences between two versions of a document
Output	A new document containing both sets of tracked changes	A new document showing differences as tracked changes
Revision sets preserved	Yes, each reviewer’s changes are kept separate	No, all differences are attributed to a single author
Comments merged	Yes, comments from both documents are retained	Yes, comments are shown as comments from the original author
Use case	Two reviewers edited the same original independently	You have two versions and want to see what changed

Use Combine when you need to preserve each reviewer’s identity and revision set. Use Compare when you only need a clean list of differences without caring who made each change.

You can now merge multiple Word documents while keeping each reviewer’s tracked changes intact. Start with the Combine feature under Review > Compare, always choose New document as the merge target, and repeat the process for additional versions. For a cleaner merge, uncheck Formatting in the comparison settings if style differences are not relevant. To speed up review, use the Accept All Changes command on the Review tab after confirming the merge is correct.