The fastest way to spot differences between two Word files

Microsoft Word has a built-in comparison tool that shows you exactly what changed between two versions of the same document. Open the newer version, go to the Review tab, click Compare, and select the older version from your computer. Word will create a new document that marks every insertion, deletion, and formatting change in a different color, with a panel on the left listing each change.

This method works best when you have two complete files and want to see all differences at once. The comparison document itself is read-only — you are looking at a marked-up version, not editing the original files. If you need to accept or reject individual changes, you can do that from the Review tab in the comparison document.

If you are using Google Docs instead of Word, the process is different and simpler: open one document, click File, then Version history, and you can see every change made and who made it. Google Docs does not require a separate comparison step because it tracks changes automatically.

Key Takeaways

  • Word's Compare tool creates a marked-up document showing insertions in blue, deletions in red, and formatting changes in a different color, with a summary panel listing every change.
  • You must have both files saved on your computer or accessible through OneDrive to use Word's Compare feature — it does not work with files still open in the cloud.
  • Google Docs shows all changes automatically in version history without requiring a separate comparison step, and you can see who made each change and when.
  • If you only need to see the files side by side without marking changes, you can open both documents and arrange the windows manually using Windows Snap or macOS Split View.

Using Word's Compare tool step by step

Start with the newer version of your document already open in Word. Click the Review tab at the top of the ribbon. Look for the Compare button — it is usually near the left side of the ribbon, often grouped with other review tools. Click it and select Compare from the dropdown menu (not Combine, which is for merging edits from multiple people).

A dialog box will open asking you to choose the original document. Navigate to the older version on your computer and click Open. Word will process both files and create a new document showing all differences. The comparison document has three sections: the marked-up version in the center, the newer file on the right, and the older file on the left. A panel below lists every change in order.

Each type of change appears in a different color. Insertions (text added) are usually blue, deletions (text removed) are usually red, and formatting changes appear in a third color. Moved text shows as a combination. You can click any change in the list to jump directly to it in the document.

Accepting or rejecting changes in the comparison

The comparison document itself cannot be edited directly — it is a read-only view. However, you can accept or reject individual changes, which updates the newer version of your document. Click the change you want to address in the list on the left, or navigate to it in the document. Then go to the Review tab and click either Accept or Reject.

If you accept a change, it becomes permanent in the newer file. If you reject it, the text reverts to what was in the older version. You can also click Accept All or Reject All to handle every change at once, though this is risky if you have not reviewed them. After you finish accepting or rejecting, save the newer document with a new name if you want to keep both versions.

Comparing files in Google Docs

Google Docs tracks every change automatically, so you do not need a separate comparison tool. Open the document you want to review, click File in the top left, and select Version history. A panel appears on the right showing every saved version with a timestamp and the name of the person who made the change.

Click any earlier version to see what the document looked like at that point. The current version appears on the left, and the selected earlier version appears on the right, with changes highlighted in color. You can see insertions, deletions, and formatting changes without any extra steps. If you want to restore an earlier version, click the three dots next to it and select Restore this version.

This approach is useful if multiple people have edited the same document and you want to see who changed what. It is also simpler than Word's Compare tool because Google Docs does the tracking for you automatically — there is no separate comparison document to create.

Viewing two documents side by side without marking changes

If you want to look at both files at the same time without creating a marked-up comparison, you can arrange them in separate windows. On Windows, open both documents and use Snap: click and drag the title bar of one document to the left edge of your screen until it snaps to fill the left half, then drag the other document to the right half. Both files now appear side by side.

On a Mac, open both documents, then click and hold the green maximize button on one document's title bar. A menu appears letting you choose Tile Window to Left of Screen or Tile Window to Right of Screen. Do the same for the second document on the opposite side. You can now read both files at once and scroll through them independently.

This method does not mark changes, so you are doing the comparison yourself by reading. It is useful if you only need to spot obvious differences or if you want to copy text from one file to the other without the comparison markup getting in the way.

Handling large documents or many changes

If your document is very long or has hundreds of changes, the comparison can be hard to navigate. Word's change list on the left helps — you can click any change to jump to it when ready rather than scrolling through the whole document. Use the Next and Previous buttons in the Review tab to move through changes one at a time.

If the comparison is too cluttered to read, you can hide the original files and show only the marked-up version. In the Review tab, look for Show Markup and adjust what is displayed. You can turn off formatting changes if you only care about text, or hide moved text if it is making the document harder to read.

For Google Docs, version history can show dozens of versions if the document has been edited many times. You can click any version to see what changed since the previous one, or jump directly to a version from several days ago if you want to see a larger span of changes at once.

When comparison tools do not work the way you expect

Word's Compare tool sometimes fails to recognize changes if the files have very different formatting or if they were created in different versions of Word. If the comparison looks wrong or shows changes that do not exist, try saving both files as .docx format (the modern Word format) and comparing again.

If you are comparing a Word file to a PDF or a file from a different program, Word's Compare tool will not work. Instead, open both files in separate windows and compare them manually. Some third-party tools can compare PDFs or files from other programs, but Word's built-in tool only works with Word documents.

Google Docs version history only works if both versions are in Google Docs. If you downloaded a Word file, edited it offline, and uploaded it again, Google Docs will see it as a completely new file rather than a version of the original. To track changes across that kind of edit, use Word's Compare tool instead.

Frequently Asked Questions

Can I compare two Word documents if one is on OneDrive and one is on my computer?

Word's Compare tool requires both files to be accessible from your computer. If one is on OneDrive, read it first, then run the comparison. Alternatively, if both files are in OneDrive or SharePoint, you can use the web version of Word, which has a Compare feature in the Review tab.

Does Word's Compare tool show who made each change?

No. Word's Compare tool shows what changed and marks it with color, but it does not track who made each change. If you need to know who edited what, use Track Changes while editing (Review tab, Track Changes toggle) so each person's edits are marked with their name. For documents already edited without tracking, Word cannot recover that information.

What if I want to keep both versions but also see the differences?

Run the comparison, which creates a new marked-up document. Save that comparison document with a descriptive name like "Document_Comparison_v1_vs_v2". Your original two files remain unchanged. The comparison document shows all differences but is read-only, so you can refer to it without accidentally editing it.

Can I compare more than two documents at once?

Word's Compare tool only works with two documents at a time. If you need to compare three or more versions, compare the first two, then compare the result with the third. This gets confusing quickly, so for multiple versions, Google Docs version history is usually clearer because you can jump between any two versions without creating intermediate files.

Why does the comparison show changes I did not make?

Word sometimes marks formatting changes as differences even if the text is the same — for example, if one file uses a different font or line spacing. You can ignore these if you only care about text changes. If the comparison shows text changes that look identical, the files may have different invisible characters or encoding. Save both files as .docx and try again.