You can compare two versions of a document to see how they differ. You can also merge two versions of the same document into one new document. In both cases, Word
shows the differences with revision marks.
 | Note You cannot merge two separate documents into one. |
Do any of the following:
 | Compare two versions of a document |
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Open one of the two versions of the document that you want to compare.
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On the Tools menu, point to Track Changes, and then click Compare Documents.
| Note If the Compare Documents option is not available, the document might be protected. To unprotect a protected document, on the Tools menu, click Unprotect Document. |
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On the Original document pop-up menu, select the original document.
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On the Revised document pop-up menu, browse to the other version of the document, and then click OK.
Changes from the revised copy are merged into a new copy that is based on the original copy of the document. The original copy remains untouched. Revision marks show any differences introduced by the revised copy of the document.
 | Tip To change document comparison settings or the level of detail shown, on the Tools menu, point to Track Changes, click Compare Documents, and then click  . |
| Merge two versions of a document |
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Open one of the two versions of the document that you want to merge.
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On the Tools menu, click Merge Documents.
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On the Original document pop-up menu, select one version of the document.
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On the Revised document pop-up menu, browse to the other version of the document, and then click OK.
