How to Sign a PDF Document with Digital Signature?
STEP 1: Open your existing PDF document or create your document in Adobe Acrobat.
STEP 2: Next step, on the top right there are tabs, click on Sign.
STEP 3: Select the lowest tab that drops down Work with Certificates.
STEP 4: To timestamp, digitally sign and keep the document valid after the certificate expires, select one of the Certify options Visible or Not Visible, whichever suits your document.
STEP 5: Then, click and drag where you want your signature to appear on the PDF page(s).
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