Annotate PDF
Highlight, underline, draw and mark up any PDF online. Free to annotate, no account needed.
- 🔒 Files deleted after 1 hour
- ⚡ Secure 256-bit SSL
- ⭐ 4.8/5 from 12k+ users
The ultimate solution to convert and manage PDF documents with ease
PDFSwitch AI meets all requirements to convert, edit and manage your PDF documents.
PDF editing made easy
Edit your PDFs effortlessly with our intuitive tools. Add text, images, annotations, or even e-signatures, all in just a few clicks.
100% safe and secure
PDFSwitch AI keeps your documents and privacy safe. You can boost security with features like file password encryption, encrypted storage, and more.
15 million people, 180 countries, one simple tool
More than PDF editing, much more
How to annotate pdf
- Upload your PDFDrag & drop your file into the upload area, or click to browse.
- Mark it upThe editor opens with the Highlight tool ready. Highlight, draw, add notes and comments.
- Add more markupSwitch tools to draw arrows, sticky notes, checkmarks and more.
- Download your annotated PDFClick Done to export your marked-up document.
Why choose PDFSwitch AI
All-in-one PDF editor
Annotate, sign, edit, convert and protect — everything in one browser tab.
Rich markup tools
Highlight, draw, sticky notes, arrows, checkmarks and text comments.
Serious about privacy
Files are encrypted in transit and deleted within 1 hour.
No setup needed
Works on any device straight from the browser.
Review-ready
Perfect for proofreading, feedback and collaborative review.
Fast and intuitive
Upload, annotate and download in seconds.
Frequently asked questions
Is annotating a PDF free?
Yes — annotating is free. You only pay when you download the finished document.
Can I highlight and draw?
Yes. Highlight text, draw freehand, add arrows, sticky notes and checkmarks.
Are my files safe?
Files are encrypted in transit and automatically deleted within 1 hour.
What file size can I annotate?
Up to 100 MB per PDF on the free tier.