How to annotate a PDF
- 1
Open the PDF
Choose or drop the file.
- 2
Mark it up
Highlight text, click to add a note, or draw freehand in any colour.
- 3
Download
Click “Save annotated PDF”.
Why use this PDF annotator?
Highlighter, notes and pen
The three tools you need for reading and reviewing, in any colour.
100% private
Your PDF is processed in your browser and never uploaded – safe for contracts, invoices and ID documents.
Free, no limits
No account, no watermark, no daily limit and no file size cap.
Works on any device
Windows, Mac, Linux, iPhone or Android – nothing to install.
Popular uses
- Studying lecture notes
- Reviewing a draft
- Marking up plans
- Correcting homework
- Giving design feedback
- Preparing for a meeting
Frequently asked questions
How do I highlight text in a PDF?
Choose “Highlight” and drag across the text. The highlight is saved into the PDF and shows in every viewer.
Can I write notes on a PDF?
Yes. Choose “Text”, click anywhere and type; pick a colour first if you like.
Are my files uploaded?
No. Everything runs in your browser; your PDF never leaves your device.
Is it free?
Yes. No sign-up, no watermark and no limit on the number or size of files.