PDF files have the option to let you share and comment on documents in a wide range of applications. Adobe Acrobat Reader and other free PDF programs offer a subset of the capabilities of the paid ...

PDF-XChange Editor is has a boatload of features, for creating, editing, annotating, and securing PDF documents. The fully functional free versions offer plenty for many users, but you’ll have to pay ...

Adding audio comments to Acrobat is available for both the free version (Acrobat DC) and the paid version (Acrobat Pro). Adding audio comments to Acrobat can be done by directly recording the audio in ...