Annotate PDF Online

Highlight text, draw arrows and shapes, and add notes to a PDF. Part of Freeflow Tools, ready in seconds.

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How to use Annotate PDF

Mark up a PDF for review or study. Highlight, circle, draw arrows and add text notes, then save the marked-up copy.

  1. Drop your PDF to open the editor.
  2. Choose Highlight, Draw, Arrow, Rectangle or Text and mark the page.
  3. Change colours and thickness in the options bar.
  4. Press Export and choose Download PDF.

Why use Annotate PDF here

  • Highlighter in five colours
  • Pen, lines, arrows, rectangles and ellipses
  • Text notes
  • Undo and redo

Frequently asked questions

How do I highlight text in a PDF?

Choose Highlight and drag across the text. Pick the colour in the bar above the page.

Are my marks saved in the PDF?

Yes. When you press Download PDF they are written into the file.

Is Annotate PDF free?

Yes, and you do not need an account. The free plan allows up to 20 MB and 5 files at a time, and 10 free uses a day. After that you can come back tomorrow or choose a plan. The paid plans (Plus and Pro) remove the wait and raise the file size limit to 250 MB and 500 MB.

Do I need to install anything?

No. Open the page and use it. There is nothing to install, and it works on phones, tablets and computers.

What if something goes wrong?

Open Support from the menu at the top of the page and tell us what happened. A use that fails is not counted against your limit.

Does it work on my phone?

Yes. It works in current versions of Chrome, Safari, Edge and Firefox on phones, tablets and computers. Very large files can be slow on older phones.

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