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EDIT
Leave a sticky-note comment on a PDF that others can read in any PDF viewer.
QUICK ANSWER
To add a comment to a PDF, add the file, type your comment and choose Add comment. A sticky-note marker is placed on the first page with your comment inside, and readers click it to open the note. It runs in your browser, so your file isn’t uploaded.
Updated 8 November 2026 · Written by the StackPDF teamUpdated 8 November 2026 · StackPDF team
You’ll write your comment next. It stays in this browser.You’ll write your comment next. It stays in this browser.
PDF files · Runs in your browser
QUICK ANSWER
To add a comment to a PDF, add the file, type your comment and choose Add comment. A sticky-note marker is placed on the first page with your comment inside, and readers click it to open the note. It runs in your browser, so your file isn’t uploaded.
Updated 8 November 2026 · Written by the StackPDF teamUpdated 8 November 2026 · StackPDF team
HOW TO
Drop it here, or choose it from your computer, your phone or My files.
Type the note. To place a comment on a specific page, use Edit PDF.
Readers see a sticky-note marker and can open it in any PDF viewer.
GOOD TO KNOW
Three ways to give feedback on a PDF.
| TOOL | WHAT IT ADDS | USE IT FOR |
|---|---|---|
| Add comments | A sticky note with your text | General feedback and questions |
| Highlight text | Highlights on every match of a word | Pointing at specific terms |
| Draw shapes | A box, circle, line or arrow | Circling an area of the page |
To place notes anywhere on any page, use Edit PDF.
PRIVACY
Yes. Add comments to a PDF runs in your browser, so the file never leaves your device.
StackPDF opens the PDF in your browser tab and does the work there.
Close the tab and it’s gone. Free results download to your device. Premium can also keep them in My files.
pdf-lib, PDF.js and qpdf do the work, inside your browser.
FAQ
Add the PDF, type the comment and choose Add comment. A sticky note with your text is added to the first page.
Yes. The free plan includes 1 PDF export a day, with no account. Premium removes the daily limit for $5.99 a month or $39.99 a year.
No. The comment is added in your browser, so the PDF stays on your device.
Yes. It’s a standard PDF sticky note, so Acrobat, Preview and most other viewers show the marker. Readers click it to read your text.
On this page the note goes on the first page. To place notes anywhere on any page, use Edit PDF.
Yes. Run Flatten PDF afterwards and the note becomes part of the page, so it can’t be edited or deleted.