We show you how to add notes to a PDF with Microsoft Edge, Adobe Acrobat Online, and the free PDF viewer UPDF.

How the creator of a PDF file sets up her document determines the extent to which you can use Acrobat Reader's commenting tools to mark the file with notes about its content.

You can import and add a PDF to OneNote as a file attahcment or printout image, or convert and add PDF to OneNote. Here's how!

Wondering how to edit a PDF on a Mac? Want to do it for free? You can! There is a free PDF editor built right into MacOS and it's really easy to use. We show you how to edit a PDF on a Mac, plus ...