To create a custom watermark for your PDF documents, use a program such as Adobe Acrobat, A-PDF Watermark or PDF Watermark Creator.

How to Make a Slide Show in PDF Format. Creating a professional slideshow in PDF format is ideal for printing and distribution purposes. For example, when you print a slideshow that includes ...

To see alt text in a completed PDF document, you'll need to use a screen reading app, which is an accessibility tool for visually impaired users.

Fortunately, Apple has added the ability to electronically sign a PDF document using Preview, a program that comes preinstalled on every Mac running OS X Lion or later.