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.

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.

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.

India introduces eSign, a fast and secure way to digitally sign documents using Aadhaar OTP. This paperless method transforms how agreements and applications are signed. It is authorised by the ...