How do I know if a digital signature in my document is valid?

Open your PDF document in Adobe Acrobat. Click on the 'Signatures' panel on the left side. Right-click on the specific digital signature you want to check. Select 'Validate Signature' from the menu to see its status.

What is a trusted identity and why does it matter for digital signatures?

A trusted identity refers to a digital certificate that you have chosen to trust in Adobe Acrobat. It matters because Acrobat uses this trust to decide if a digital signature is valid. If you trust the certificate of the person who signed the document, Acrobat can confirm their identity and that the document has not been changed since they signed it. Managing trusted identities helps you control who you believe is authentic.

If a digital signature says 'valid but with warnings', what should I do?

First, check the warning details. It might be about the certificate's trust or a timestamp issue. Next, try to verify the certificate information. Make sure it comes from a known and reliable source. Consider adding the signer's certificate to your list of trusted identities if you know and trust them. If the warning is about long-term validity, add LTV information to make the signature self-validating over time.

Why is it important to add Long Term Validation (LTV) information to a digital signature?

Adding Long Term Validation (LTV) information to a digital signature is important because it helps the signature stay valid far into the future. Without LTV, a signature might become invalid if the signer's certificate expires or is revoked. LTV embeds all the necessary information, like timestamps and revocation status, directly into the PDF, making the signature self-validating over a long period, even without external checks.

What is the difference between verifying a signature and managing trusted identities?

Action Purpose Outcome. Verifying a signature To check if a specific digital signature on a document is valid, who signed it, and if its certificate is trusted at that moment. You get an immediate status report on the signature's validity and integrity. Managing trusted identities To tell Adobe Acrobat which digital certificates you personally trust, so it can use this information for future signature validations. You build a list of trusted signers, making future signature verifications smoother and more reliable based on your preferences.

Validate signatures as part of classroom or academic documen in Adobe Acrobat — How-to & AI prompts

AI prompts

3 ways to ask · copy any one

AExecute — “help me do it”Help me validate signatures on my academic document...…+

Help me validate signatures on my academic document using Adobe Acrobat for [type of document].

when the reply comes backWould you like tips on spotting fake signatures?

BImprove — “do it better”How can I make signature validation clearer or easier...…+

How can I make signature validation clearer or easier to understand for [students/teachers/parents] in my classroom documents?

when the reply comes backNeed help explaining signature validation to others?

CDecide — “help me choose”What is the best way to validate signatures for...…+

What is the best way to validate signatures for [assignments/permission slips/letters] using Adobe Acrobat?

when the reply comes backDo you want to know how to keep signatures secure?

How to do it

the tool · the steps · what to avoid

1
Open the PDF document containing the digital signature you want to validate.
2
Locate the signature field or signature panel in the document.
3
Click directly on the digital signature or open the signature panel and select the signature you wish to validate.
4
In the signature details popup, click Signature Properties.
5
In the Signature Properties dialog, click Show Certificate to review certificate details if needed.
6
Close the certificate window, then click Validate Signature in the Signature Properties dialog.
Best practiceIf the signature status shows as 'Unknown' or 'Not Valid', check if the signer's certificate needs to be added to your list of trusted identities.
7
Review the validation result displayed in the Signature Properties dialog.

In the appWith the API

You can view detailed information about the signature's validity and certificate by clicking on the signature and opening Signature Properties.

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

Glossary

words on this page

ValidateTo check if something is real or correct.ExampleThe system validates your login details to confirm you are an authorized user.

SignatureYour name written in a special way to show you agree or approve.ExampleHer distinctive signature on the artwork proved its authenticity and origin.

DocumentA file or paper that has important information.ExampleShe saved the important contract as a PDF document on her computer.

The real tasks

the one, listed here

Finance asked for an audit trail today and I need to confirm every agreement has auditable timestamps.

FAQ

about this task

To validate a signature in an academic document, open the document in Adobe Acrobat, click on the signature, and look for a message or symbol that shows if the signature is valid. This helps you know if the document was signed by the right person and has not been changed.

Signature validation is important because it proves that the person who signed the document is real and that the document has not been changed after signing. This helps keep school records honest and trustworthy.

Adobe Acrobat can check digital signatures to see if they are real and unchanged. For handwritten signatures, you usually need to compare them by eye or check with the person who signed, because software cannot always tell if a handwritten signature is real.

If a signature is not valid, you should contact the person who signed the document or your teacher or school office. They can help you find out if there was a mistake or if the document needs to be signed again.

Adobe Acrobat usually shows a checkmark or a message near the signature if it is valid. If there is a problem, it might show a warning sign or a message saying the signature cannot be trusted.

Validate signatures as part of classroom or academic documen

When to use it

AI prompts

How to do it

Glossary

The real tasks

Who does this

FAQ

Sources

Adobe help