How to Redline a Word Document: Track Changes, Markup, and Collaboration Explained

Redlining a Word document means marking up a file with suggested edits, deletions, and comments so that others can see exactly what changed — and who changed it. The term comes from the old practice of editors literally drawing red lines through text on printed pages. In Microsoft Word, the digital version is built right in, and it's far more powerful than a red pen.

Here's how it works, what affects your experience, and why the same feature plays out differently depending on how you work.

What "Redlining" Actually Means in Microsoft Word

In Word, redlining is done through a feature called Track Changes. When Track Changes is active, every edit you make is recorded and displayed visually — deletions appear with strikethroughs, insertions are underlined, and formatting changes are noted in the margins. Different reviewers are assigned different colors automatically, so a document passed between three people will show three distinct sets of markups.

This is the standard workflow for legal documents, contracts, academic manuscripts, and any collaborative writing where a clear audit trail matters.

How to Turn On Track Changes ✏️

Enabling Track Changes is straightforward across Word versions:

1. Open your document in Microsoft Word
2. Go to the Review tab in the ribbon
3. Click Track Changes — it toggles on and stays on until you turn it off
4. Every edit you make from that point forward is recorded

Keyboard shortcut:Ctrl + Shift + E (Windows) or Cmd + Shift + E (Mac) toggles Track Changes on and off.

Once active, Word marks your changes in real time. When you share the file, recipients see the markup and can choose to accept or reject each change individually or all at once.

Viewing and Managing Markup

Word gives you several ways to display redlines, controlled by the Show Markup and Display for Review menus in the Review tab:

Switching between these views doesn't remove changes — it just controls how they appear on screen. This is useful when you want to proofread the "clean" version without losing the tracked history.

Accepting and Rejecting Changes

Once a document has been redlined and returned to you, the review process involves going through each change:

• Accept Change — incorporates the edit permanently into the document
• Reject Change — discards the edit and restores the original text
• Accept All / Reject All — processes every change at once

These controls live in the Review tab under the Changes group. You can step through changes one at a time using Next and Previous, which is the cleaner approach for legal or contract review where every word matters.

Comments vs. Track Changes — Not the Same Thing

Many people use comments and tracked changes interchangeably in conversation, but they behave differently:

• Tracked Changes modify the document text itself — they're inline edits
• Comments are annotations attached to a word or passage without altering the text

You add a comment by selecting text and clicking New Comment in the Review tab. Comments appear in the margin and are ideal for questions, explanations, or flagging issues without proposing a specific rewrite.

In a typical redlining workflow, both tools are used together — tracked changes propose specific edits, while comments explain the reasoning behind them.

Factors That Affect Your Redlining Experience 🔍

How smoothly Track Changes works depends on several variables:

Word version and platform. The core Track Changes feature exists across Word 2016, 2019, 2021, and Microsoft 365, but the interface and some options vary. The web version of Word (Word for the web) supports Track Changes but with a more limited set of controls than the desktop app.

File format. Track Changes data is fully preserved in .docx files. If a document is saved as .doc (the older format) or converted to PDF, markup behavior changes — PDFs don't carry live Track Changes at all. If you're collaborating across systems, .docx is the safe default.

Number of reviewers. Word assigns each reviewer a color automatically, up to a point. In heavily reviewed documents with many collaborators, the markup can become visually complex. Filtering by reviewer (via Show Markup → Specific People) helps isolate one person's changes.

Shared document settings. In Microsoft 365 environments, documents stored on SharePoint or OneDrive can be co-edited in real time with Track Changes active. In contrast, documents emailed back and forth as attachments require manual merging if multiple people edit simultaneously — Word has a Compare and Combine feature under the Review tab specifically for this situation.

Document protection. Word allows document authors to lock Track Changes on, preventing reviewers from accepting or rejecting changes — or even turning off tracking. This is common in legal and compliance settings where the audit trail must remain intact.

When You're Working Across Different Applications

Not everyone reviewing your document will use Microsoft Word. Google Docs has its own version called Suggesting mode, and Apple Pages has Track Changes as well — but markup from one application doesn't always translate cleanly into another. A document heavily redlined in Word may display differently when opened in Google Docs, and vice versa. If cross-platform compatibility is part of your workflow, that's a variable worth testing before committing to a review process.

The Gap That Only Your Setup Can Fill

Understanding how Track Changes works is the easy part. What varies significantly is how that feature fits into your actual workflow — whether you're reviewing solo or with a team, using desktop Word or the web app, working within a managed Microsoft 365 environment or passing files by email, and whether your collaborators are on Word, Google Docs, or something else entirely.

The mechanics are consistent. The experience isn't — and your specific setup is what determines which parts of this process feel seamless and which create friction.