How do I add a trusted timestamp to my PDF document in Adobe Acrobat?

Open your PDF in Acrobat. Go to 'All tools' > 'Use a certificate'. Select 'Timestamp' to get a timestamp from a trusted Time Stamping Authority (TSA). This proves the exact time of signing.

Why is Long-Term Valid (LTV) data important for digital signatures?

LTV data is important because signing certificates can expire. Without LTV, your signature might appear invalid after your certificate's expiration date. LTV data ensures your signature remains valid for many years, which is crucial for legal and archival documents. It embeds all necessary verification information into the document itself.

What happens if I don't use a trusted Time Stamping Authority (TSA) for my timestamp?

If your timestamp does not come from a trusted TSA, it might not be recognized as valid. This means the proof of when your document was signed could be questioned. Always ensure your TSA is part of a Public Key Infrastructure (PKI) to guarantee its reliability and acceptance.

Can I renew the LTV data of a signature without invalidating the original signature?

Yes, you can renew LTV data without making the original signature invalid. This is a key benefit of LTV, especially for documents that need to remain legally sound over very long periods. The renewal process updates the verification information while preserving the integrity of the initial signature and its timestamp.

How does a timestamp differ from a digital signature in securing a document?

A digital signature proves who signed a document and that it hasn't changed since. A timestamp, on the other hand, specifically proves *when* the document was signed or existed. It's like 'a lock for the lock' – it secures both the signature and the document to a precise moment in time, adding an extra layer of non-repudiation and trust regarding the timing.

Enforce timestamp and LTV policies across an organization in Adobe Acrobat — How-to & AI prompts

AI prompts

3 ways to ask · copy any one

AExecute — “help me do it”Help me enforce timestamp and LTV policies for all users in…+

Help me enforce timestamp and LTV policies for all users in [organization name] using Adobe Acrobat.

when the reply comes backWould you like tips on training your team about these policies?

BImprove — “do it better”Suggest ways to improve our organization’s timestamp and LTV enforcement…+

Suggest ways to improve our organization’s timestamp and LTV enforcement in Adobe Acrobat for better security and compliance.

when the reply comes backNeed help checking if your policies are working correctly?

CDecide — “help me choose”What are the best timestamp and LTV policy settings for…+

What are the best timestamp and LTV policy settings for [organization type or needs] in Adobe Acrobat?

when the reply comes backWant to know how to update your policies in the future?

How to do it

the tool · the steps · what to avoid

1
Open the Adobe Admin Console and navigate to the Products section.
2
Select your Acrobat product deployment and click to manage policies or settings for your organization.
3
Locate the digital signatures or security settings area within the enterprise configuration options.
4
Enable the policy that requires all digital signatures to include a trusted timestamp from a configured Timestamp Authority (TSA).
CautionEnsure the Timestamp Authority (TSA) URL is valid and reachable by all users.
5
Enable the policy that requires all signatures to include Long-Term Validation (LTV) information at signing time.
NoteLTV ensures signatures remain valid even after certificates expire or are revoked.
6
Save and apply the updated policies to all users or specified user groups in your organization.
7
Communicate the new signature requirements to end users and verify enforcement by testing with a sample PDF signature.
Best practiceSome organizations recommend periodic audits of signed PDFs to confirm LTV and timestamp compliance, as noted by enterprise IT blogs.

In the appWith the API

You can verify that signatures include timestamp and LTV information by opening the signed PDF and checking the Signature Panel.

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

Glossary

words on this page

TimestampA timestamp proves exactly when a document was signed.ExampleThe timestamp on the digital signature shows the agreement was finalized at 2:15 PM.

LTV (Long-Term Validation)LTV means a PDF's digital signature can be trusted long into the future.ExampleThe LTV on the signed agreement assured its trustworthiness for future legal reviews.

PolicyA policy is a rule everyone in an organization must follow.ExampleThe company policy states that all employees must complete safety training annually.

The real tasks

the one, listed here

Annotate the customer complaint file with timestamps and notes so the service team can act on recurring issues

FAQ

about this task

To enforce these policies, you use Adobe Acrobat's admin tools to set rules that apply to every user account. This makes sure all PDFs created or signed by your team follow the correct timestamp and LTV requirements automatically.

A timestamp records the exact date and time a document was signed, while LTV ensures that the digital signature can be trusted even years later. Both make your documents more secure and reliable.

Using these policies helps prove when documents were signed and keeps signatures valid over time, which is important for legal, business, and compliance reasons.

Yes, you can update existing PDFs by adding timestamps and enabling LTV, but you may need to re-sign or validate them using Adobe Acrobat’s tools.

You can check your organization’s settings in the Adobe Admin Console and review sample documents to make sure they have the required timestamps and LTV information.

Enforce timestamp and LTV policies across an organization

When to use it

AI prompts

How to do it

Glossary

The real tasks

Who does this

FAQ

Sources

Adobe help