This article show three methods that can be used to add audio comments to PDF documents in Adobe Acrobat free and Pro version.

With Adobe Acrobat Reader and Adobe’s online PDF editor, you can add comments, fill out forms, insert text, and even sign documents – all for free.

The PDF reader or viewer within Google Chrome has always been relatively simple, especially when compared to Microsoft Edge. With Chrome 87, Google has introduced a new UI for the PDF reader and ...

Microsoft is updating the PDF reader in the Edge browser with a useful new feature to help you annotate PDFs and highlight sections that might be locked.