Add Timestamp Advanced
Add a trusted timestamp to a PDF document. Pro plan required.
How to Add Timestamp
Upload your PDF
Timestamp is applied automatically
Download the timestamped PDF
Common questions
Frequently Asked Questions
What does a timestamp prove?
A cryptographic timestamp proves the document existed at a specific date and time, and hasn't been modified since.
Is 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.
Who issues the timestamp?
Timestamps are issued by a trusted third-party Time Stamping Authority (TSA) — an independent certifying entity.
Can the timestamp be forged?
No. The timestamp uses cryptographic hashing. Any modification to the document after timestamping invalidates the timestamp.
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