How to Add Comments in Google Docs: A Complete Guide

Google Docs comments are one of the most practical collaboration tools in any productivity suite. Whether you're reviewing a colleague's draft, leaving notes for yourself, or coordinating edits across a team, knowing how to use comments effectively makes a real difference in how smoothly a document workflow runs.

What Google Docs Comments Actually Do

A comment in Google Docs is an annotation attached to a specific piece of text — a word, sentence, paragraph, or even a single character. It floats in the right margin of the document without altering the underlying text. Comments can be replied to, resolved, reopened, and deleted, making them a lightweight alternative to tracked changes when you want to discuss rather than directly edit.

Comments are distinct from suggestions (which propose actual text edits) and notes (which don't exist as a native feature in Docs — people often confuse the two). If you want to flag something without changing the words, comments are the right tool.

How to Add a Comment on Desktop (Browser)

The most common way to add a comment is through a web browser on a laptop or desktop computer.

Step-by-step:

1. Open your document in Google Docs at docs.google.com.
2. Highlight the text you want to comment on — click and drag to select it.
3. A small toolbar will appear near your selection. Click the comment bubble icon (speech bubble with a + sign).
4. Alternatively, go to Insert → Comment in the top menu bar.
5. You can also use the keyboard shortcut: Ctrl + Alt + M on Windows/ChromeOS, or Cmd + Option + M on Mac.
6. Type your comment in the box that appears in the right margin.
7. Click Comment to post it, or press Ctrl + Enter (Windows) / Cmd + Return (Mac).

The highlighted text will turn yellow, and your comment will appear anchored to it in the margin.

How to Add a Comment on Mobile (Android and iOS) 📱

The Google Docs mobile app supports comments, though the interface differs slightly from the desktop version.

On Android:

1. Tap and hold to select the text you want to comment on.
2. Tap the three-dot menu (or the format bar that appears).
3. Select Comment.
4. Type your comment and tap Post.

On iOS (iPhone/iPad):

1. Tap and hold to select text.
2. Tap the + icon or look for Comment in the contextual menu that appears.
3. Type your note and tap Post.

Mobile comment functionality is slightly more limited than the desktop version — formatting within comments isn't supported, and navigating between multiple comments can feel less intuitive on smaller screens.

Mentioning Someone in a Comment

One of the most useful comment features is @-mentioning a collaborator. When you type @ followed by someone's name or email address inside a comment, Google Docs will:

• Notify that person by email
• Optionally prompt you to share the document with them if they don't already have access

This is useful for directing feedback to specific people without switching to a separate messaging tool.

Replying To and Resolving Comments

Comments aren't just one-way. Anyone with comment or edit access to the document can reply to an existing comment, turning it into a threaded conversation.

• To reply: Click on an existing comment and type in the Reply field.
• To resolve: Click the checkmark icon at the top right of a comment thread. This collapses the comment and marks it as resolved — the text highlight disappears, but the comment isn't deleted. Resolved comments can be viewed by clicking Comments → Open comment history in the top-right area.
• To reopen: Find the resolved comment in the history and click Re-open.
• To delete: Click the three-dot menu on a comment and select Delete. Unlike resolving, deletion is permanent.

Variables That Affect How Comments Work for You

How useful comments are — and how smoothly the feature functions — depends on several factors specific to your situation.

Comment Permissions and Access Levels

Not everyone interacting with your document has the same comment rights. Google Docs uses a tiered permission system:

• Viewer — can read the document and see existing comments, but cannot add or reply to them
• Commenter — can add comments and reply to threads, but cannot edit the document text
• Editor — can comment, reply, resolve, delete, and edit everything

The owner of the document sets these permissions when sharing. If you're trying to leave a comment and the option is grayed out, your access level is likely set to Viewer.

When Comments Behave Differently

A few situations produce unexpected comment behavior worth knowing about:

• Offline mode: Google Docs supports offline editing, but comments added offline sync when you reconnect. There can occasionally be ordering or duplication quirks during sync.
• Exported documents: If you download a Google Doc as a Word (.docx) file, comments are generally preserved and appear in Word's comment system — but formatting and threading may not carry over perfectly.
• Suggested edits vs. comments: If a collaborator has Suggesting mode enabled, their text changes appear as suggestions rather than direct edits. These are separate from comments, though both appear in the right margin.

The Part That Depends on Your Setup 🔍

The mechanics of adding comments are consistent across Google Docs. But how you use them — whether that's a solo review workflow, async team collaboration, a client approval process, or academic peer feedback — shapes which features matter most to you.

Access levels, team size, the devices your collaborators use, and whether your organization uses a managed Google Workspace environment all influence the experience in ways no general guide can fully map out. The gap between knowing how comments work and knowing how they should work for your specific document workflow is exactly where your own setup becomes the deciding factor.