The Smallpdf Blog

Use our online PDF Annotator to highlight text in a PDF and add annotations for free. Access and use the tool online, anytime—no registration needed.

Can you add comments to a PDF? Yes! Learn how to add notes, annotations, and comment boxes with online and native tools.

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.

Easily add checkboxes to PDFs for forms, surveys, or quick checklists for free with Smallpdf—on any device—or with Preview on macOS.

You can quickly and easily draw on a PDF online for free. No account signup or software downloads needed. Here we show you how.

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.

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.