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.

Add a timestamp to a PDF signature with LTV enabled in Adobe Acrobat — How-to & AI prompts

AI prompts

3 ways to ask · copy any one

AExecute — “help me do it”Help me add a timestamp to my PDF signature with LTV enabled...…+

Help me add a timestamp to my PDF signature with LTV enabled in Adobe Acrobat for [describe your document or purpose].

when the reply comes backShow me how to check if my PDF signature has LTV.

BImprove — “do it better”How can I make my PDF signature more secure and valid...…+

How can I make my PDF signature more secure and valid for a long time using timestamp and LTV in Adobe Acrobat for [describe your situation]?

when the reply comes backExplain why timestamps matter for signed documents.

CDecide — “help me choose”Should I use a timestamp and LTV for my PDF signature...…+

Should I use a timestamp and LTV for my PDF signature in Adobe Acrobat for [explain your document or reason]?

when the reply comes backGive tips for keeping digital signatures safe.

How to do it

the tool · the steps · what to avoid

1
Open the PDF you want to sign in Adobe Acrobat Pro.
2
Go to the Tools pane and select Certificates.
3
Click Digitally Sign and draw the signature area on the document.
4
In the signature dialog, select your digital ID and click Continue.
5
Click Sign and save the signed PDF when prompted.
6
After signing, right-click the signature and choose Show Signature Properties.
7
Click Show Signer's Certificate to verify your certificate if needed.
8
In the Signature Properties dialog, click Add Verification Information.
9
Ensure Include the revocation information and Timestamp options are checked.
CautionA trusted Time Stamp Authority (TSA) must be configured in Acrobat's preferences for timestamping to work.
10
Click OK to embed the timestamp and LTV data into the signature.
11
Save the PDF to finalize the signature with timestamp and LTV enabled.
Best practiceIf you do not see your preferred TSA, you can add it under Preferences > Signatures > Document Timestamping.

In the appWith the API

Right-clicking a digital signature lets you add or verify timestamp and LTV information for long-term validation.

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.

PDF SignatureA PDF signature is a digital way to sign a PDF file.ExampleYou apply your PDF Signature to the rental agreement, confirming your consent digitally.

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.

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

In Adobe Acrobat, you can add a timestamp by choosing to sign your PDF digitally, then selecting the option to include a timestamp and enable LTV (Long-Term Validation) before you finish signing. This makes your signature show the exact time it was added.

LTV stands for Long-Term Validation. It means your digital signature will stay valid and can be checked even years later, because all the needed information is saved inside the PDF.

A timestamp proves exactly when you signed the document, which can be important for contracts, school forms, or any situation where the signing date matters.

No, you need to add the timestamp when you sign the PDF. If you forgot, you have to sign the document again and include the timestamp and LTV options.

Yes, a PDF signature with LTV is better for important documents because it stays valid longer and can be checked in the future, even if some online services are not available.

Add a timestamp to a PDF signature with LTV enabled

When to use it

AI prompts

How to do it

Glossary

The real tasks

Who does this

FAQ

Sources

Adobe help