The fastest way to spot differences between Word documents

Microsoft Word has a built-in comparison tool that shows you exactly what changed between two versions of the same document. Open the document you want to compare, go to the Review tab, select Compare, then choose Compare again from the dropdown menu. Pick the earlier version of the document from your file browser, and Word will create a new document showing every addition, deletion, and formatting change in a different color.

The comparison appears as tracked changes in a side-by-side view by default. Insertions show in blue, deletions in red, and moves in green. Word also generates a summary panel on the left listing every change so you can jump between them without scrolling. This method works for any two .docx files, whether they're on your computer, OneDrive, or SharePoint.

Key Takeaways

  • Word's Compare feature creates a new document showing all changes in color-coded tracked changes, making differences impossible to miss.
  • The side-by-side view displays the original document on one side and the revised version on the other, with a summary panel listing every change.
  • You can accept or reject individual changes directly in the comparison document, then save the final version with your decisions applied.
  • Google Docs and LibreOffice offer similar comparison tools if you're using those editors instead of Word.

Setting up the side-by-side view in Word

After you run the Compare function, Word opens a new document with three panes visible. The left pane shows a list of all changes grouped by type — insertions, deletions, formatting changes, and moves. The center pane displays the original document, and the right pane shows the revised version. You can resize these panes by dragging the dividers between them if you need more space for one section.

If the three-pane layout doesn't appear, go back to the Review tab and look for Compare options. You can toggle between different viewing modes: Original shows only the earlier version, Final shows only the newer version, and Final: Show Markup displays the final document with all changes marked in color. The Show Source Documents option lets you view the original and revised documents side by side without the summary pane if you prefer that layout.

Understanding what each color means

Word uses a consistent color system to mark different types of changes. Text that was added appears in blue with an underline. Text that was removed appears in red with strikethrough. Formatting changes — like bold, italics, font size, or color — appear as balloons in the margin with a description of what changed. Moved text appears in green, showing both where it was removed from and where it was inserted.

Each change also displays the name of the person who made it and the date and time of the edit, assuming the document tracked that information. If multiple people edited the document, you can filter the view to show only changes from one person by using the Show Markup menu. This is useful when you're reviewing edits from a specific team member or want to focus on one type of change at a time.

Accepting or rejecting individual changes

You don't have to keep every change that appears in the comparison. Click on any change in the summary pane or directly in the document, then use the Accept or Reject buttons in the Review tab. Accepting a change makes it permanent in the document. Rejecting a change removes it and reverts that section to the original text.

If you want to move through changes one at a time without deciding on each one individually, use the Next and Previous buttons to navigate. You can also right-click directly on a change and select Accept Change or Reject Change from the context menu. Once you've made all your decisions, save the document with a new filename to preserve both the original and your final version.

Comparing documents in Google Docs and LibreOffice

Google Docs doesn't have a dedicated comparison tool, but you can see all edits if the document has version history enabled. Click File, then Version history, then See all versions. Select two versions from the list, and Google Docs will highlight the differences between them. You can also use the Suggesting mode to see proposed changes as you work, though this is better for real-time collaboration than comparing finished documents.

LibreOffice Writer, the free alternative to Word, has a comparison feature under Edit > Track Changes > Manage. You can merge two documents and see the differences marked similarly to Word, with insertions and deletions shown in different colors. The process is slightly different from Word, but the end result is the same — a clear view of what changed between versions.

When to compare documents instead of using track changes

The Compare feature is most useful when you have two finished versions of a document and need to understand what's different between them, but you don't have the original tracked changes available. This happens when someone edited a document without turning on track changes, or when you're comparing versions that were edited in different programs or by different people over time.

If you're actively collaborating with others and want to see changes as they happen, using Track Changes from the start is better than comparing later. Turn on Track Changes in the Review tab before you begin editing, and every change will be recorded automatically. This creates a clear audit trail and makes it easier to discuss specific edits with your team in real time rather than reviewing everything at the end.

Saving and sharing your comparison results

When you run the Compare function, Word creates a brand new document that contains all the marked changes. This document is separate from both the original and revised versions you compared. You can save it with a descriptive name like "Document_Comparison_Final" to keep track of what it contains. The original files remain unchanged unless you explicitly edit and save them.

If you want to share the comparison with someone else, send them the new comparison document that Word created. They can open it in Word and see all the changes marked in color, navigate through them using the summary pane, and even accept or reject changes themselves if you give them permission. This is useful for getting feedback on edits or documenting exactly what changed between versions for compliance or record-keeping purposes.

Frequently Asked Questions

Can I compare more than two documents at once?

Word's Compare feature only works with two documents at a time. If you need to compare three or more versions, you'll need to run the comparison multiple times — first comparing version one and two, then comparing that result with version three. This creates a chain of comparisons that shows all changes across all versions.

What if the documents are in different formats, like .doc and .docx?

Word can compare documents in different formats, but it works best when both files are in the same format. If you're comparing an older .doc file with a newer .docx file, convert the .doc file to .docx first by opening it in Word and saving it as a .docx. This prevents formatting issues from interfering with the comparison.

Does the comparison show changes to images or just text?

The Compare feature primarily tracks text and formatting changes. If images were added, removed, or moved between versions, Word may note that something changed in that area, but it won't show you a detailed visual comparison of the images themselves. For detailed image comparisons, you'll need to review the documents manually or use a specialized image comparison tool.

Can I undo a comparison if I made a mistake?

The comparison document is a new file separate from your originals, so you can straightforward close it without saving if you made a mistake. Your original documents remain unchanged. If you already saved the comparison document and want to start over, just delete it and run the Compare function again with the same two original files.

Is there a way to compare documents without opening Word?

Some third-party tools like DiffDocs and Workshare offer document comparison outside of Word, and they sometimes provide features Word doesn't have. However, Word's built-in Compare tool is free and works well for most situations. If you're using Google Docs or LibreOffice instead, those programs have their own comparison features built in.