Annotate and highlight PDFs online

Highlighter, pen, rectangles, ellipses, arrows, sticky comments, stamps and emoji — all exported as real vector marks in the saved PDF, not flattened screenshots, so they stay sharp at any zoom.

Open the free Annotate PDF tool

Free · No upload · No sign-up · No watermark

How to annotate a PDF

  1. Open the editor and load your PDF.
  2. Pick a tool: Highlighter, Pen, Arrow, Shape, Comment or Stamp.
  3. Mark up the page; change colours and stroke widths in the side panel.
  4. Save to download the annotated PDF.

Questions

Can I undo a mark?
Yes. Undo and redo keep up to 60 steps, and the eraser removes individual marks.
Will the highlights show in other PDF readers?
Yes. They are written into the page itself, so every reader displays them.
Is my file uploaded?
No. The whole job runs inside your browser tab, so the document never leaves your device. You can even disconnect from the internet once the page has loaded.

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