The Smallpdf Blog

Need to mark up a PDF? Add arrows, circles, or freehand notes? You can draw directly on a PDF file in seconds using Smallpdf or other built-in tools.

Need to show changes or suggestions on a contract or report? Here's how to redline a PDF quickly and clearly — no advanced tools or complicated setup.

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.

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.