Annotate PDF – Free Online

Add highlights, comments, underlines and strikethroughs to any PDF — all in your browser.

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Drop your PDF here or click to browse

One PDF file — max 32 MB — processed entirely in your browser

1. Upload your PDF 2. Pick a tool & drag on the page 3. Save annotated PDF

How to Annotate a PDF Online

  1. Upload your PDF by clicking the drop zone or dragging a file onto it.
  2. Choose an annotation tool from the toolbar: Highlight, Underline, Strikethrough, or Comment.
  3. Click and drag on the page to place your annotation. For comments, a text box will appear.
  4. Navigate between pages using the arrow buttons and annotate as many pages as needed.
  5. Click Save Annotated PDF — your file downloads instantly with all annotations baked in.

About PDF Annotation

Highlights, underlines, and strikethroughs are drawn directly onto each page as coloured shapes. Comments are embedded as sticky notes visible in any PDF reader. No data ever leaves your device.

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