Formatting Issues

Why Word Combine Ignores Identical Highlighting Changes & Workarounds

Maira Mehtab Sep 22, 2026 869 views

Question details

Users want to understand why Microsoft Word does not flag differences when two different reviewers apply the exact same highlight color to the same text during the Combine process.

Product: Microsoft Word
Device & OS: not provided
Scenario: Combining multiple reviewed documents where different users have applied highlighting to text.
Observed behavior: The Combine feature shows no differences between the documents if both reviewers applied the exact same formatting or highlighting change to the same text.

Before you start

Before distributing documents for review, communicate with your team to establish a standardized method for highlighting and commenting to prevent overlapping identical changes.

Solution 1Recommended

Assign Different Highlight Colors to Reviewers

Ensure Word can distinguish between reviewers by having each person use a unique highlight color.

Microsoft Word's Combine feature evaluates the final resulting documents rather than the identity of the person making the change. If two reviewers apply the exact same yellow highlight to a paragraph, the resulting formatting in both documents is identical. Consequently, Word detects no conflict or difference to display.

To bypass this limitation, you can assign a specific highlight color to each reviewer before the review process begins.

Assign specific colors

Instruct Reviewer A to use yellow highlighting, Reviewer B to use green highlighting, and so on.

Apply distinct highlights

During the review, select the text, click the drop-down arrow next to the 'Text Highlight Color' icon on the Home tab, and choose the assigned color.

Combine the documents

Go to the Review tab, click 'Compare', select 'Combine', and merge the documents. Word will now detect the differing highlight colors as distinct formatting changes.

Combine Limitations: This method relies on manual coordination. Word does not automatically assign different highlight colors to different users.

Solution 2

Use Comments Instead of Highlighting

Use the Comment feature to explicitly track who is making a note or calling attention to specific text.

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Frequently Asked Questions

Why doesn't Word Combine show identical text insertions by different authors?

Just like formatting, Word's Combine tool compares the final text output. If two reviewers independently insert the exact same word into the exact same location, the resulting documents match perfectly in that spot. Word sees no structural difference to flag.

Can I automatically assign highlight colors to different reviewers in Word?

No, Word does not have a native feature to automatically bind specific highlight colors to user profiles. You must manually agree on a color-coding system with your team prior to the review.

Does the Track Changes feature record who highlighted the text?

Track Changes primarily records text edits (insertions, deletions, and moves) and explicit formatting changes. However, basic Text Highlight Color is often treated as character formatting. If identical highlighting is applied without Track Changes turned on, the author metadata is not explicitly bound to the highlight itself.

Document & File Issues