What a redline document is and why you need it

A redline document is a version of a file where every change — added text, deleted text, moved paragraphs, formatting shifts — appears marked on the page instead of being silently applied. Word calls this feature Track Changes. When you turn it on, Word shows insertions in one color (usually blue), deletions struck through in another color (usually red), and comments in balloons on the margin. The original author and anyone else reviewing the document can see exactly what changed and who made each change.

Redlining matters because it lets multiple people work on the same document without losing the original version or creating confusion about what was altered. A lawyer reviewing a contract, an editor working with a writer, or a team collaborating on a proposal all use redlines to propose changes while keeping the source document intact. The person who owns the document can then accept or reject each change one at a time, or accept all changes at once.

Without Track Changes, you would have to manually compare two versions side by side, guess which sentences were new, and hope you did not miss anything. With it, Word does the comparison for you and marks every difference visually.

Key Takeaways

  • Track Changes marks every insertion, deletion, and comment in a document so reviewers can see what changed without altering the original text.
  • You turn Track Changes on in the Review tab, and it stays on until you turn it off — every edit made while it is active will be marked.
  • The document owner can accept or reject individual changes, or accept all changes at once to finalize the document.
  • Redlined documents are most useful when multiple people need to review and propose edits before a final version is locked in.
  • Word stores change history in the file itself, so you can see who made each change and when, as long as the document has not been finalized.

How to turn Track Changes on and off

Open your document in Word and go to the Review tab at the top of the ribbon. You will see a button labeled Track Changes with a small arrow next to it. Click the button itself (not the arrow) to toggle tracking on. When it is active, the button will appear highlighted or pressed, and you will see a notification in the status bar at the bottom of the window saying "Track Changes: On".

From that moment forward, every keystroke you make — every word you type, every sentence you delete, every space you add — will be marked as a change. If you paste text from another source, Word will mark the entire pasted section as an insertion. If you cut text, it will show as a deletion. Formatting changes like bold, italics, or font size will also appear as tracked changes if you have that option enabled.

To turn Track Changes off, click the button again. The button will no longer be highlighted. Any edits you make after this point will be applied directly to the document without marking. This is useful when you are done reviewing and ready to finalize the text, or when you want to make small fixes without cluttering the document with minor tracked changes.

Understanding what appears on a redlined page

When Track Changes is on, Word uses color and formatting to show you what changed. By default, insertions appear in blue with an underline, and deletions appear in red with a strikethrough. At the right edge of the page, Word places a vertical line in the margin next to any paragraph that contains a change — this margin indicator helps you spot which sections have been edited at a glance.

Comments appear in balloons — small boxes that float in the right margin and contain the reviewer's note. Each balloon is numbered and linked to the spot in the text where the comment applies. If you hover your mouse over a change, a small popup will show you the name of the person who made it and the date and time it was made.

The colors and formatting can be customized. If you or a colleague is colorblind, or if you straightforward prefer a different visual style, you can change how Track Changes displays by clicking the arrow next to the Track Changes button and selecting Change Tracking Options. From there you can adjust colors, choose whether deletions show as strikethrough or as balloons, and decide whether formatting changes are marked at all.

How to review and accept or reject changes

Once someone has sent you a redlined document, you need to decide what to keep and what to discard. Go to the Review tab and look for the Changes group of buttons. You will see Accept and Reject buttons, usually with small arrows next to them. You can click Accept All Changes to approve every edit at once, or you can step through the document one change at a time using the navigation arrows.

To review changes one by one, click the down arrow next to Accept (or use the forward arrow button labeled Next). Word will jump to the first change and highlight it. Read the change, then decide: click Accept to keep it, or Reject to remove it and restore the original text. Word will then move to the next change. This method takes longer but lets you think about each edit individually.

When you accept a change, the markup disappears and the text becomes part of the final document. When you reject a change, the marked text is removed and the original wording returns. Once you have reviewed all changes, the document will show no more markup — it will look like a normal document with no history of edits visible.

When redlines are useful and when they are not

Redlines work best when a small group of people need to review a document before it is finalized. A lawyer sending a contract to a client, an editor working with a writer on an article, or a manager asking team members to comment on a proposal — these are all situations where Track Changes shines. Everyone can see what was suggested, understand why, and make an informed decision about whether to keep each change.

Redlines become unwieldy when too many people edit the same document, or when edits pile up over many rounds of revision. A document that has been reviewed by five different people and revised four times can become hard to read because the markup covers so much of the page. In these cases, it is often clearer to accept all changes, create a clean version, and start fresh with a new round of tracking if needed.

Redlines also do not work well for real-time collaboration. If you and a colleague are both editing the same document at the same time in Word Online or through Microsoft 365, you will see each other's changes live, but the markup can feel chaotic. For simultaneous editing, many teams prefer to use Word's co-authoring feature without Track Changes, or to use a different tool designed for live collaboration.

How to share a redlined document and what happens next

To send a redlined document to someone else, save it as a normal Word file (.docx) and email it or upload it to a shared folder. The recipient will open the file and see all the marked changes exactly as you made them. They can then review each change, accept or reject them, add their own comments, and turn Track Changes back on to propose further edits if needed.

The change history stays embedded in the file as long as Track Changes remains active. If someone accepts all changes and saves the file, the markup disappears but the file itself is no longer "redlined" — it becomes a clean document. If you want to preserve a record of what was changed, save a copy of the redlined version before accepting changes, or use Word's version history feature if you are working in Microsoft 365.

One important note: if you send a redlined document to someone and they make changes without Track Changes turned on, those edits will not be marked. Always confirm with the recipient that Track Changes is on before they start editing, or turn it on yourself before sending the document to them.

Common confusion points with Track Changes

Many people turn on Track Changes and then forget it is on, making edits for days without realizing every keystroke is being marked. Check the Review tab or the status bar regularly to confirm whether tracking is active. If you have been editing for a while and do not want all those changes marked, you can select all the text you just added, turn off Track Changes, and then turn it back on for future edits.

Another common mistake is accepting changes in the wrong order. Word moves through changes in the order they appear in the document, not in the order they were made. If you want to reject a change that appears early in the document but accept a later one, you can do that — just navigate to each change and make your choice. You do not have to accept or reject them in sequence.

Some people also confuse Track Changes with the Undo button. If you reject a change, it is gone from the document, but you can still undo that rejection by pressing Ctrl+Z (or Cmd+Z on Mac) when ready after. Once you save the file, however, the rejection is permanent.

Frequently Asked Questions

Can I turn off Track Changes and still see what was changed?

No. Once you turn off Track Changes, Word stops marking new edits. If you turn it back on later, only the new edits will be marked. To see the full history of changes, Track Changes must remain on. If you have already turned it off, you can undo recent actions with Ctrl+Z, but you cannot recover a record of changes made before you turned it off.

What if I want to hide the markup but keep the changes in the document?

Go to the Review tab and click the arrow next to Track Changes. Select Show Markup and then uncheck the types of changes you want to hide (insertions, deletions, comments, formatting). The changes are still in the document and will be applied when you accept them — you just will not see the visual markup. You can turn the markup back on anytime.

Can I see who made each change?

Yes. Hover your mouse over any marked change and a small popup will show the name of the person who made it, the date, and the time. Word pulls this information from the user account that is logged into the computer. If multiple people use the same computer or account, Word will not be able to distinguish between them.

What happens if I accept changes and then change my mind?

If you have not saved the file yet, press Ctrl+Z to undo the acceptance. If you have already saved, you cannot recover the change history — the file is now clean and the markup is gone. This is why it is a good idea to save a copy of the redlined version before accepting all changes, especially if you might need to reference what was edited later.

Can I use Track Changes in Word Online or on my phone?

Word Online supports Track Changes, though the interface is slightly different from the desktop version. The mobile app for Word has limited support for Track Changes — you can view marked changes but cannot easily turn tracking on or off or accept and reject changes. For full control over redlining, use the desktop version of Word.