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

Need to edit a PDF document but don’t want to pay for the more expensive Adobe editors? You can add text to and sign a PDF with just the free Reader program.

How to Delete & Insert Pages in Acrobat 5. Adobe Acrobat 5 predates the Acrobat product line's division into Professional and Standard versions.

Insert Page Numbers in a PDF If you're using Adobe Acrobat to edit a PDF file, you can add page numbers in your preferred style to some or all of the document.

Need to edit a PDF document but don’t want to pay for the more expensive Adobe editors? You can add text to and sign a PDF with just the free Reader program.