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Annotate PDF

Write, draw, or highlight text on PDF documents with our free PDF annotator. Done using our annotation tools? Export the annotated PDF with no watermarks, convert it to a different format, or compress it for easier sharing.

  • Annotate PDFs on Mac, Windows, and Linux
  • Free and easy to use PDF markup tool–no installation required
  • Trusted by 2.4 billion people since 2013

Annotate PDF Blog Articles

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How To Annotate PDF
How to Add Comments to Your PDFs
Learn the simplest way to add comments to a PDF. Discover how to add notes and comment boxes with online and native tools.
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How To Annotate PDF
Add Notes to Your PDF to Boost Efficiency & Collaboration
Adding notes to a PDF doesn’t have to be a chore. With Smallpdf’s easy-to-use annotator, you can mark up documents in no time and stay organized.
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How To Annotate PDF
How to Add Checkboxes to Your PDFs
Easily add checkboxes to PDFs for forms, surveys, or quick checklists for free with Smallpdf—on any device—or with Preview on macOS.
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How To Annotate PDF
Draw on PDF for Free Online
The most popular online web app to draw on PDF files using your mouse, stylus, or trackpad. No signup or registration is needed.
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How To Annotate PDF
How To Annotate a PDF on Mac—Fast & Free
Need to annotate or mark up a PDF on your Mac—for free? Here are three easy options, so you can pick the way that’s best for you.
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How To Annotate PDF
How To Annotate a PDF on Windows—Three Easy Ways
Need a free option to annotate or write on a PDF? Here are three easy tools that you can use on your Windows device for all of your PDF markup needs.
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