You can Certify a document, attest to its content or approve a document with the Digitally sign option. Add an electronic signature to a PDF document online in a few easy steps Digital ID: An electronic representation of data based on the ITU-T X v3 standard, associated with a person or entity. When you Digitally sign with a certificate, the signature is considered an approval signature Set your signature verification preferences. describes the validity of the signature Start your free trialFoll