Annotate PDF
Add sticky-note comments and highlights as real, editable PDF annotations.
Drop a PDF here, or click to select
Files never leave your device
Mark up a PDF the way a reviewer would: drop sticky-note comments and drag highlights over the parts that matter. These are saved as genuine PDF annotations, so they appear in the comments panel of Acrobat, Preview, and other readers — where anyone can reply to, move, or delete them. Nothing is baked into the page, so the underlying document stays untouched.
All markup is added locally in your browser, so confidential documents never leave your device. To permanently stamp text or shapes into the page instead, use the Edit PDF tool.
How it works
- 1Select or drag in your file
- 2Choose your options and click “Annotate PDF”
- 3Download the result — everything ran in your browser
Frequently asked questions
Are these real annotations or drawn onto the page?
Real PDF annotations (Text and Highlight). They live in the document's annotation layer, so readers show them as comments you can open, reply to, or remove — the page content itself isn't changed.
Will the comments show up in other PDF readers?
Yes. Text (sticky-note) and Highlight annotations are standard, so Acrobat, Preview, and most viewers display them in their comments/markup panel.
Is my PDF uploaded to annotate it?
No. Your file is processed entirely in your browser using JavaScript — it is never uploaded to a server, so nothing can be stored, leaked, or read by anyone else.