Annotate a PDF
Mark up a PDF for review: highlight and underline the words that matter, leave comments, and point at things with arrows. Other people can see, reply to and remove your marks in any PDF app.
- Highlight, underline, strike through text
- Sticky-note comments with your name
- Boxes, circles, lines and arrows
- Real annotations, not flattened drawings
Click on the page to place your text.
How to annotate a PDF
- Step 1Add your PDFDrop the document you are reviewing.
- Step 2Mark it upDrag across text to highlight it, click to add a note, drag to draw shapes.
- Step 3Save annotated PDFSend it back; the comments show in any PDF reader.
Questions
Is it free to annotate a PDF?
Yes. It is free with no sign-up and no watermark. The free plan covers up to 50 tasks a day; Pro removes every limit.
Do you upload my files?
No. The tool runs inside your browser using WebAssembly. Your file never leaves your device, and it still works with Wi-Fi turned off.
Does it work on my phone?
Yes. It works in Chrome, Safari, Edge and Firefox on Android, iPhone, Windows, Mac and Linux.
Will my comments show in Adobe Reader?
Yes. Highlights, notes and shapes are saved as standard PDF annotations, so Adobe Reader, Chrome, Edge, Preview and most phone apps show them, and people can reply to or delete them.
Can I highlight a scanned PDF?
A scan has no text to snap to. Use the Box tool to mark areas, or run OCR PDF first to make the text selectable.