What is the difference between an electronic seal and a drawn signature?
A drawn signature is an image placed on the page. A seal is computed from the content: change a single byte and it fails. That is what makes tampering detectable.
Seal a PDF
Apply an electronic seal that makes any later change detectable.
An electronic seal proves where a document comes from and that it has not changed since. Unlike a drawn signature it is not an image pasted onto the page: it is computed from the content, and a single altered byte breaks it. The original document is not rewritten — the seal is appended, and every earlier revision stays readable.
Your document travels to our servers in Europe just long enough to receive the seal, then it is deleted. We keep no copy.
Common questions
Does a seal prove who signed?
It proves where the document came from and that it has not moved since. It is an organisation seal, not a person's signature: it does not bind a named individual the way a qualified signature would.
Is the original document rewritten?
No. The seal is appended by incremental update: the original bytes do not move, and every earlier version stays readable.
What happens to my file afterwards?
This tool needs a machine: your file is sent to our servers in Europe, processed, then deleted automatically. We keep no copy and we do not read it.