The fastest way to spot differences between two 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 newer version first, then go to the Review tab and click Compare (in newer versions) or Track Changes > Compare (in older versions). Select the earlier version from your file browser. Word will create a new document that highlights every insertion, deletion, and formatting change in a different color, with a summary panel on the left showing what changed and where.

This method works best when you're comparing documents you created yourself or received from a single source. If multiple people have edited the same file at different times, Word's comparison still works, but you'll see all changes layered together rather than person by person. For that level of detail, you'd use Track Changes instead — but comparison is faster when you just need to see the final differences without the editing history.

Key Takeaways

  • Word's Compare feature creates a new document showing all differences highlighted in color, with a side panel listing every change by location.
  • You can compare any two Word documents, even if they're not tracked versions of each other, as long as they're in .docx or .doc format.
  • The comparison shows insertions, deletions, and formatting changes, but you'll need to manually accept or reject each one if you want to keep only certain edits.
  • If you're comparing documents to understand privacy or security changes — like in a terms-of-service update — the comparison view makes those changes visible without reading the entire document twice.

Where to find the Compare button and what happens when you click it

In Microsoft Word 2016 and later (Windows and Mac), the Compare tool lives on the Review tab in the ribbon at the top. Click the Compare button directly — it usually shows a small icon of two overlapping documents. A dialog box opens asking you to select the original document. Navigate to the file you want to compare against, select it, and click Open.

Word then generates a brand-new document. This new file is temporary unless you save it yourself. The original two documents stay unchanged. The comparison document shows the newer version as your main text, with all changes marked in balloons (comment-like boxes) on the right margin. Insertions appear in one color, deletions in another, and formatting changes in a third. A Revisions pane on the left lists every change in order, so you can jump to any edit by clicking it.

If you're using Word 2013 or earlier, the path is slightly different: go to Review tab, then Track Changes, then Compare. The result is the same — a new document with all differences highlighted.

How to read the comparison results and understand what changed

The comparison document uses color coding to distinguish types of changes. By default, insertions (text added) show in blue, deletions (text removed) in red, and formatting changes in green or another color depending on your Word version. Each change appears in a balloon on the right side of the page, with a line connecting it to the exact location in the text where the change occurred.

The Revisions pane on the left shows a summary of all changes. It lists them in order from top to bottom, grouped by type — "Insertions," "Deletions," "Formatting," and so on. Click any item in that list to jump directly to that change in the document. This is especially useful if you're comparing long documents and need to find a specific edit quickly.

If the balloons are cluttering your view, you can hide them temporarily. Go to Review > Tracking (or Track Changes in older versions) and choose straightforward Markup or No Markup. straightforward Markup shows a thin vertical line in the margin instead of balloons; clicking the line reveals the change. No Markup hides all markings but keeps the changes in the document — useful if you want to see the final result without visual clutter.

When to use Compare instead of Track Changes

Use Compare when you have two finished documents and need to see what's different between them. This includes comparing a document you received from someone else against your own version, checking what a colleague changed without their edit history, or reviewing updates to a shared template or policy document.

Use Track Changes when you're actively editing a document and want to record who made each change and when. Track Changes is designed for collaborative work where you need to preserve the editing history. If you turn on Track Changes before you edit, every keystroke is recorded. Comparison, by contrast, is a one-time snapshot — it shows the differences but not the step-by-step process of how they happened.

If you receive a document with Track Changes already turned on, you can see the history of edits without using Compare. But if someone sent you a document with Track Changes turned off, or if you're comparing two completely separate versions, Compare is your only option.

Accepting or rejecting individual changes after comparison

Once Word shows you the comparison, you can accept or reject each change one at a time. Right-click any change in the balloons on the right, and you'll see options to Accept Change or Reject Change. Accepting a change means keeping it in the final document; rejecting it means removing it and reverting to the original text.

You can also use the Review tab to move through changes systematically. Click Accept or Reject buttons (or Accept All Changes and Reject All Changes if you want to handle them in bulk). The Next and Previous buttons let you step through one change at a time, deciding on each one before moving forward.

Be careful with bulk accept or reject — it applies to all remaining changes at once. If you're unsure about some edits, step through them individually instead. Once you've accepted or rejected all changes, the balloons disappear and you're left with a clean document showing only the text you decided to keep.

Comparing documents with different file formats or older Word versions

Word's Compare tool works best with .docx files (the standard format in Word 2007 and later). If you're comparing a .docx against a .doc file (older Word format), Word will usually handle it without trouble, but the comparison may be less precise. Formatting changes might not display correctly, or minor differences in how the two formats store information could create false positives in the comparison.

If one document is in .doc and the other in .docx, consider converting both to .docx before comparing. Open the .doc file in Word, go to File > Save As, and choose Word Document (.docx) from the format dropdown. Save it with a new name so you keep the original. Then run the comparison.

If you're comparing a Word document against a PDF or Google Docs file, Word's Compare tool won't work directly. You'd need to convert the PDF or Google Doc to a Word file first. For PDFs, this usually means copying the text and pasting it into a new Word document, which loses formatting but preserves the words. For Google Docs, read the file as a .docx from the File menu, then compare as normal.

Privacy and security considerations when comparing sensitive documents

When you use Compare, Word creates a new temporary document on your computer. If you're comparing documents that contain sensitive information — financial records, personal data, or confidential business content — that temporary file exists on your hard drive until you delete it. If you save the comparison document, it stays there permanently unless you remove it.

If you're working on a shared computer or a device you don't fully control, be aware that the comparison document could be recovered by someone with access to your file system, even after you think you've deleted it. For highly sensitive comparisons, consider doing the work on a personal device you control, then deleting the comparison file when you're done. On Windows, you can use the Cipher command to securely overwrite deleted files; on Mac, use find Empty Trash if your drive supports it.

If you're comparing documents you received from someone else, the comparison may reveal information about their editing process or the tools they used. This is usually harmless, but if you're concerned about privacy, don't share the comparison document with third parties without checking with the original author first.

Frequently Asked Questions

Can I compare more than two documents at once?

No, Word's Compare tool only handles two documents at a time. If you need to compare three or more versions, compare the first two, save the result, then compare that result against the third document. This creates a chain of comparisons, though it can get confusing with multiple layers of markup.

What if the two documents have completely different layouts or page breaks?

Word will still compare them, but the results may be harder to read. If one document is reformatted significantly — different margins, font sizes, or page breaks — the comparison will show those formatting changes along with any text changes. You might see a lot of formatting markup that obscures the actual content differences. In that case, focus on the text changes and ignore the formatting markup, or manually review the documents side by side instead.

Does Compare work if one document is password-protected?

If the document is protected with a password that prevents editing, Word cannot compare it. You'll need to unprotect the document first by entering the password. If you don't have the password, you cannot use Compare on that file.

Can I undo a comparison after I've accepted changes?

Once you accept or reject changes and close the comparison document, you cannot undo those decisions using Word's undo function. If you think you made a mistake, close the comparison document without saving, and Word will ask if you want to save changes. Click Don't Save to discard all your accept/reject decisions and start over. If you already saved, you'll need to reopen the original documents and run the comparison again.

Is there a way to compare documents without creating a new file?

No, Word's Compare tool always creates a new document. However, you can view the comparison in straightforward Markup mode, which hides the balloons and shows only a thin line in the margin. This makes the original document easier to read while still showing you where changes occurred. You can then decide whether to save the comparison document or discard it.