How to Add Comments to a PDF
Follow these three steps to place sticky-note comments on a PDF. No software installation required.
Open Your PDF
Select one PDF from your device or drag and drop it into the workspace. Enter the correct password if the document is protected.
Add or Review Comments
Click anywhere on a page, enter an optional name, and write your message. Existing sticky-note comments can also be opened, edited, or removed.
Save and Download
Review the comment list, click “Save comments,” then download the new PDF with its updated notes.
How Does This PDF Comment Tool Work?
Each comment is saved as a sticky-note annotation attached to a specific position on a PDF page. The note remains separate from the page’s original text and images instead of being written permanently over them. The tool also reads existing standard sticky-note comments, allowing you to update or remove them before saving. Compatible PDF readers can open these notes from their page icons, although their appearance and editing controls may vary by application. Highlights, drawings, callouts, and text boxes are not edited by this tool. Your PDF is processed locally in your browser while the updated file is created.
What "processed locally" means
- Your PDF is opened on your device
- The file and its password are not uploaded
- Comments are added and removed in your browser
- The updated PDF is downloaded directly from your browser
Sticky-Note Comments vs. Flattened Comments
Choose whether comments should remain interactive or become a permanent part of the page.
| Approach | What happens | Best for |
|---|---|---|
| Sticky-note comments | Notes remain separate PDF annotations that open from page icons | Review feedback that may still need editing |
| Flattened comments | The visible annotation becomes part of the page content | Final copies where annotations should no longer be editable |
This tool creates sticky-note annotations. Use the Flatten PDF tool afterward when visible comments need to become permanent page content.
Why Use This PDF Comment Tool?
Easy to Use
Add feedback to a PDF without learning a complex review application. A straightforward workspace keeps commenting accessible for an occasional document review.
Clearer Feedback
A note is easier to understand when it stays with the part of the document it concerns. Readers do not have to match a separate message to an uncertain page or paragraph.
Leave the Content Intact
Feedback can sit alongside the document without rewriting its text or images. You can discuss a draft while keeping the original page content available to read.
No Software Setup
Review the PDF directly in your browser without installing a desktop editor. It is convenient when a report or proposal simply needs a few comments.
Free to Use
Give useful document feedback without a paid PDF subscription. No account or payment details are required to save the commented copy.
Private Review Workspace
Unpublished documents and your review notes remain on your device while you work. The commented PDF is created locally without uploading the material for processing.
PDF Comments FAQ
How do I add comments to a PDF online?
Add comments in three steps: 1. Select one PDF from your device. 2. Click a position on any page, enter an optional name, and write your message. 3. Click “Save comments,” then download the new PDF.
What type of PDF comments does this tool create?
The tool creates standard PDF sticky-note comments. It does not create highlights, drawings, text boxes, callouts, stamps, or inline text edits.
Can I place a comment anywhere on a PDF page?
Yes. Click the location where the note belongs. The downloaded PDF stores the comment at the corresponding position on that page.
Can I edit comments already stored in a PDF?
Yes, for supported sticky-note comments. Open an existing note to change its author or message, then save the updated PDF.
Can I delete existing PDF comments?
Yes. Remove individual sticky-note comments from the page or comment list, or use “Clear all comments” to remove every supported note shown in the workspace.
Is the PDF comment tool free?
Yes. You can add PDF comments without registration, software installation, or credit card details.