How do I know if my Digital Signature is valid?

After signing, look for a blue ribbon icon on the document. This shows it's signed. Click on the signature to see its details, including who signed and if it's valid. A valid signature means your Digital ID was correctly used and verified.

What is the difference between 'signing' and 'certifying' a PDF with a Digital Signature?

Feature What it does When to use it. Signing Adds your digital signature to a PDF. Others can still make changes, but changes after signing will show the signature as invalid. When you need to approve or agree to content, and others might still need to add comments or signatures. Certifying Adds a special digital signature that locks the document. No one can make changes without breaking the certification. It can only be the first signature on a PDF. When you are the author and want to ensure the document's content remains unchanged after you publish it.

If I get an error saying 'No Digital ID found,' what should I do to apply a Digital Signature?

First, check if you have a Digital ID installed on your computer. You might need to create one if you don't. Go to 'Edit' > 'Preferences' > 'Signatures' in Acrobat. Click 'More' next to 'Identities & Trusted Certificates'. Here, you can import an existing Digital ID or create a new one. Follow the on-screen steps to set it up. Once your Digital ID is ready, you can go back and try to apply your digital signature again.

Last-Minute Signature Scramble in Adobe Acrobat — How-to & AI prompts

AI prompts

1 way to ask · copy any one

DBecome — “help me grow”We habitually scramble to collect SOP signatures when an audit looms. Diagnose why signatures…+

We habitually scramble to collect SOP signatures when an audit looms. Diagnose why signatures cluster at audit time and recommend one sustainable practice—signature calendar, delegated sign-off, or periodic compliance sweep—that ensures a complete, auditable package without last-minute fire drills. Outline how to phase it in over the next quarter.

when the reply comes backPush once: ask it to sharpen the weakest part, and to say what it assumed.

How to do it

the tool · the steps · what to avoid

1
Open your PDF document in Adobe Acrobat.
2
Select the Signatures tool from the right-hand pane or access it through the Tools center.
3
In the dialog that appears, add the email addresses of the people you want to request digital certificate-based signatures from.
4
Position signature fields on the document for each signer as needed.
5
Ensure that the signature type is set to require a certificate-based digital signature (not an e-signature).
CautionAdobe Acrobat supports both e-signatures and certificate-based digital signatures; make sure you select the certificate-based option for legal or compliance needs.
6
Customize the message to recipients if desired.
7
Click Send to distribute the document for digital certificate-based signatures.
8
Monitor the status of the document and receive notifications as recipients sign.
Best practiceSome recipients may need to configure their digital ID in Acrobat before signing; sending instructions or a help link can reduce delays.

In the appWith the API

You can track the progress of each requested signature directly within the Acrobat app under the 'Manage' or 'Home' section.

This runs in the Acrobat app - there is no separate API for this task.

Glossary

words on this page

Digital IDA secure electronic identity used to sign documents or unlock protected files.ExampleYou use your digital ID to securely sign into the company's online portal.

Private KeyThis is a secret code that only you have, used to create your unique digital signature.ExampleYour private key works like a secret stamp, creating your unique digital signature when you sign a document.

Public Key/CertificateA public key or certificate is shared with others so they can check if your signature is real.ExampleSharing your public key allows others to confirm your digital signature's authenticity.

Who does this

3 roles

Contract ManagerLegal CounselProcurement Officer

FAQ

about this task

After signing, look for a blue ribbon icon on the document. This shows it's signed.
Click on the signature to see its details, including who signed and if it's valid.
A valid signature means your Digital ID was correctly used and verified.

Feature	What it does	When to use it
Signing	Adds your digital signature to a PDF. Others can still make changes, but changes after signing will show the signature as invalid.	When you need to approve or agree to content, and others might still need to add comments or signatures.
Certifying	Adds a special digital signature that locks the document. No one can make changes without breaking the certification. It can only be the first signature on a PDF.	When you are the author and want to ensure the document's content remains unchanged after you publish it.

Adobe Acrobat needs a Digital ID because it contains your private key. This private key is a secret code that creates your unique digital signature. When you sign, the Digital ID proves your identity and ensures that the signature is truly yours. Without it, anyone could pretend to be you.

First, check if you have a Digital ID installed on your computer. You might need to create one if you don't.
Go to 'Edit' > 'Preferences' > 'Signatures' in Acrobat. Click 'More' next to 'Identities & Trusted Certificates'.
Here, you can import an existing Digital ID or create a new one. Follow the on-screen steps to set it up.
Once your Digital ID is ready, you can go back and try to apply your digital signature again.

Yes, you can use the same Digital Signature on many different documents. Your Digital ID is unique to you, not to a specific document. If a document changes after you apply your digital signature, the signature will show as invalid. This is a security feature to alert you that the document's content is no longer exactly what you signed. It helps maintain the integrity of the document.

Last-Minute Signature Scramble

When to use it

AI prompts

How to do it

Glossary

The real tasks

Who does this

FAQ

Sources

Adobe help