How to sign a PDF on an iPhone or Android using Adobe Fill & Sign If you're using an iPhone or Android mobile device to digitally sign a PDF, you'll want to download an app called Adobe Fill & Sign.

How to Create a Digital Signature Using PDF Security. Adobe Acrobat enables you to create PDF documents that are compatible with virtually every operating system and platform. PDF documents also ...

If you would like to learn how to digitally sign a PDF documents online for free using the cloud-based eSign PDF signature service this guide ...

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.