Add TimestampPro
Add a trusted timestamp to a PDF document. Pro plan required. Secure and fast.
How to Add Timestamp
Upload your PDF
Timestamp is applied automatically
Download the timestamped PDF
Frequently Asked Questions
1What does a timestamp prove?
A cryptographic timestamp proves the document existed at a specific date and time, and hasn't been modified since.
2Is a timestamp the same as a digital signature?
No. A timestamp proves when the document existed. A digital signature proves who signed it. Both can be combined for complete evidence.
3Who issues the timestamp?
Timestamps are issued by a trusted third-party Time Stamping Authority (TSA) — an independent certifying entity.
4Can the timestamp be forged?
No. The timestamp uses cryptographic hashing. Any modification to the document after timestamping invalidates the timestamp.
Why Use ZiaSign's Add Timestamp Tool?
ZiaSign's trusted timestamp tool adds a cryptographic timestamp to your PDF, proving the document existed at a specific point in time. Essential for intellectual property, regulatory filings, and legal evidence.
Also known as: pdf timestamp · trusted timestamp pdf · document timestamp · cryptographic timestamp
How-to guide
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Step-by-step instructions to add a trusted timestamp to a pdf document with ZiaSign.
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