Certify the final project closeout documents into an archived, certified PDF set and save the completed package to the…
Open the PDF document you want to certify in Adobe Acrobat.
Go to the Tools pane and select Protect.
In the Protect toolbar, click Certify with Visible Signature or Certify with Invisible Signature depending on your preference.
Drag to draw the signature field on the page if prompted for a visible signature, or confirm placement for an invisible signature.
In the dialog that appears, select your digital ID from the list or add a new one if necessary.
Set the Permissions options to control what changes are allowed after certifying (e.g., no changes, form fill-in only, or comments only).
Optionally, enter a reason for certifying the document.
Click Sign to apply the certifying signature.
Save the PDF when prompted to complete the certification process.
Best practiceIf you need to allow others to fill forms or add comments after certification, choose the appropriate restriction option before signing.
After certifying a PDF, Acrobat will display a blue ribbon in the document’s toolbar to indicate the document is certified and show any allowed changes.
This runs in the Acrobat app - there is no separate API for this task.
| Feature | Digital Signature | Certificate Signature |
|---|---|---|
| Purpose | To sign a document, like signing paper. | To certify a document, showing it is the final version and locking it. |
| When to use | Can be added to a PDF at any time, even after others have signed. | Can only be added to a PDF that has no other signatures on it. |
Certifying a final closeout package is important because it officially marks the document as complete and final. This special signature tells everyone that the document should not be changed after this point. It adds a strong layer of trust and security, proving that the document's content is authentic and has not been tampered with since it was certified. This is crucial for legal, financial, or project completion documents.
A Digital ID is like your unique electronic fingerprint. It contains your private key, which is a secret code used to create your certificate signature. When you certify a PDF, your Digital ID proves it was you who applied the certification. It matters because it links the certification directly to your identity, ensuring accountability and verifying the document's origin.
No, you cannot certify a PDF if it already has an e-signature from someone else. The 'Certify' feature in Acrobat is designed to be the very first signature on a document. If there are existing signatures, the 'Certify' option will not be available. You must start with an unsigned PDF to certify it.