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 files. Word will create a new document that highlights every addition, deletion, and formatting change in a different color, with a panel on the left showing who made each change and when.

If you do not have Microsoft Word or prefer not to use it, Google Docs offers a simpler alternative: upload both documents to Google Drive, open the newer one, click the three-dot menu, select Version history, and you can see a timeline of changes. For documents that are not yours or that you received from someone else, this method shows you the edit history if the original creator enabled it.

If neither of those options works for your situation — perhaps you have two completely separate files with no shared history — you can also open both documents side by side in Word or use a free online diff tool designed for plain text. The method you choose depends on whether the documents have a shared editing history and whether you need to see who made each change.

Key Takeaways

  • Word's Compare feature creates a marked-up version showing every change in color, with a panel listing who changed what and when.
  • Google Docs version history works only if both versions are in Google Drive and the original creator kept the edit history.
  • Opening two documents side by side in Word lets you scan for differences manually, which works best for spotting obvious changes quickly.
  • Free online text comparison tools work if you copy the text from both documents, but they do not preserve Word formatting like bold or italics.
  • The Compare feature in Word is the most reliable method when you have the actual .docx files and want a complete record of changes.

Using Word's Compare feature for a detailed change report

Open the newer version of your document in Microsoft Word. Click the Review tab at the top of the screen. In the ribbon, find the Compare button — it usually sits near the left side of the Review tab, often grouped with other tracking 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 take a moment to scan both files, then create a new document showing the differences. Deletions appear in red with strikethrough, additions appear in blue and underlined, and formatting changes appear in a different color. A panel on the left lists every change with the date and time it was made.

You can accept or reject each change individually by right-clicking it in the left panel, or you can accept all changes at once. If you want to keep the marked-up version as a record, save it with a new name like "Document_Comparison_Final.docx" so you do not overwrite either original.

Opening documents side by side when you want to scan manually

If you prefer to look at both documents at the same time without Word marking up the changes, you can split your screen. Open the first document, then open the second document in a separate Word window. On Windows, use the keyboard shortcut Windows key + Left arrow to snap the first window to the left half of your screen, then click the second window and press Windows key + Right arrow to snap it to the right half.

On a Mac, open the first document, then hold the green maximize button in the top-left corner of the window until you see options to tile it to the left side. Open the second document and repeat the process to tile it to the right. This method works best when the documents are similar in length and you are looking for obvious changes like missing paragraphs, reordered sections, or new headings.

Manual side-by-side review is slower than using Compare, but it gives you more control and does not create a third document. It also works in any word processor, not just Word, so it is useful if you are comparing documents in Google Docs, LibreOffice, or another editor.

Using Google Docs version history if both files are in Drive

If both versions of your document are already in Google Drive, you can see the edit history without downloading anything. Open the newer version in Google Docs. Click the three-dot menu in the top-right corner and select Version history. A timeline appears on the right side showing every saved version with the date, time, and name of the person who made the change.

Click any earlier version in the timeline to see what the document looked like at that point. The current version appears on the left, and the selected older version appears on the right, with changes highlighted in color. You can see who edited what and when, and you can restore an older version if needed by clicking the three-dot menu next to it and selecting Restore this version.

This method only works if the document was created in Google Docs or uploaded there and has an edit history. If someone sent you a Word file via email, it will not have version history unless you upload it to Drive and then manually edit it to create a new version. Version history also does not appear if the original creator turned off edit history or if the document is older than 30 days and Google has archived the history.

Using online text comparison tools for plain-text documents

If you have two plain-text files or if you want to compare the text content without worrying about formatting, you can use a free online diff tool. Copy all the text from the first document, paste it into the left box on a site like Diffchecker or Text Compare, then paste the text from the second document into the right box. Click Compare or Find Difference, and the tool will highlight what is different between the two.

These tools are fast and require no software installation, but they strip away all formatting — bold, italics, colors, and page breaks disappear. They work best for comparing the actual words and sentences, not the layout or design of the document. They also do not show you who made changes or when, so they are less useful if you need to track edits by person.

Online diff tools are also helpful when you are comparing documents created in different programs. If one file is a Word document and the other is a PDF or a Google Doc, you can copy the text from both and paste them into the tool without worrying about format compatibility.

What to do when the documents have no shared history

If you have two completely separate Word files with no connection to each other — perhaps one is a draft someone emailed you and the other is a version you worked on independently — Word's Compare feature is still your best option. It does not require the documents to have a shared editing history; it straightforward scans both files and reports every difference.

The Compare feature will show you additions and deletions, but it will not tell you who made the changes or when, because the two files were never edited together. If you need that information, you will have to ask the other person or check the file properties (right-click the file, select Properties on Windows or Get Info on Mac, then look at the Details tab) to see when each file was last modified.

If the documents are very different and you are not sure which version is newer, open both in Word and check the file properties of each one. The file with the later modification date is usually the newer version, though not always — someone might have opened an old file and saved it without making changes. In that case, use the Compare feature in both directions: compare the first to the second, then compare the second to the first, to see which direction makes more sense.

Choosing the right method for your situation

Use Word's Compare feature if you have both .docx files on your computer and want a complete, marked-up report of every change. This is the most thorough method and works even when the documents have no shared history.

Use Google Docs version history if both versions are in Google Drive and you want to see who made each change and when. This method is fast and requires no extra steps, but it only works for documents with an edit history.

Use side-by-side viewing if you want to scan both documents at once without creating a new file, or if you are comparing documents in a program other than Word. This method is slower but gives you more control.

Use online text comparison tools if you only care about the words and sentences, not the formatting, or if you are comparing documents created in different programs. These tools are fast and require no software, but they strip away all design elements.

Frequently Asked Questions

Can I compare two Word documents if one is a PDF?

Word's Compare feature only works with .docx files. If one document is a PDF, you have two options: convert the PDF to a Word document using an online converter (the quality depends on how the PDF was created), or copy the text from the PDF and paste it into an online diff tool alongside the text from the Word document. The second method is faster but loses all formatting.

Does Word's Compare feature work with older .doc files?

Yes, Word can compare both .doc and .docx files. However, if you are working with very old .doc files, it is safer to save them as .docx first to avoid compatibility issues. Open the file in Word, click File, select Save As, and choose Word Document (.docx) from the format dropdown.

What if I want to see changes but keep both documents unchanged?

Word's Compare feature creates a new document with the changes marked, leaving both originals untouched. You can save this new document with a descriptive name like "Comparison_Report.docx" and refer to it without altering the original files. You can also delete the comparison document later if you do not need it.

Can I compare documents if they are stored in OneDrive or SharePoint?

Yes. read both versions to your computer, then use Word's Compare feature as usual. Alternatively, if both versions are in OneDrive and you have edit history enabled, you can use the version history feature in OneDrive by right-clicking the file and selecting Version history, though this is less detailed than Word's Compare tool.

Why does Word's Compare feature show changes I did not make?

Word sometimes flags formatting changes that are invisible to the eye — like a space that was deleted and re-added, or a font that was changed to the same font. You can ignore these if they do not affect the content. If there are too many minor changes to review, you can filter the comparison panel to show only major changes by clicking the dropdown menu in the left panel and selecting Show only formatting changes or Show only comments.