Edit & annotate
Annotate PDF
Highlight, comment, draw and mark up without changing the content.
How it works
- 1Upload your file — drag it in or pick it from your device.
- 2Choose the options you need; defaults work for most files.
- 3Press Process and watch the progress in real time.
- 4Download the result. Anonymous files are deleted shortly after.
What this tool does
- Accepts: .pdf · one file at a time
- Produces: pdf
- Runs on: the pdf worker, in an isolated process with a 3-minute ceiling
- Account: required, because the result is stored in your workspace
Questions
Will my annotations show up in other PDF readers?
Yes. They are written as standard PDF annotations, which every mainstream reader understands.
How do I make annotations permanent?
Use Flatten PDF. That merges them into the page so they cannot be moved or deleted.
Security note
Files are checked to be what they claim (by content, not extension), processed in a sandboxed worker with no network, and deleted on the schedule your plan sets. We do not run antivirus and do not claim to — please do not upload files you do not trust. Read the security page.