If a signature is not validated in a PDF, we see Validity unknown with a question mark. You need to validate the signature to make it valid.

How to Convert a Signed Signature to PDF. Adobe Acrobat is a powerhouse of productivity in the business world. It lets you create forms, documents, reports and presentations in the nimble PDF ...

This tutorial shows you how to enable and validate Digital Signature for PDF files in the Microsoft Edge browser. You can also view digital signatures in Edge.

Signing documents the old fashioned way? Ditch that pen for good! Here’s how to easily create a digital signature using your phone.

How to Put a PDF Image in an Outlook Signature. Adding a signature to your emails allows you to include important information by default with all of your correspondence. Outlook 2013 supports the ...

You can edit a PDF on your Mac with Preview, an app that's built-in to your computer from the start. You can use this program to edit photos, too.