Verify
Check a signed document
Someone sent you a PDF and it says it was signed. Drop it in and find out in seconds whether that is true. No account, and the file never leaves your device.
Drop the signed PDF here
Or tap to choose a file from this device.
- Checked on your device
- Never uploaded
- Takes seconds
The result
You get one of three answers
In plain words, with the record to back them up. No jargon to decode, no report to interpret.
Genuine and unchanged
This exact file is the one sealed when signing finished. You also see who signed it, when, and its entry in the public log.
Changed since it was sealed
It claims to be one of our documents, but the file was edited after completion. Ask the sender for the copy from their account.
No record of it
Not necessarily fake. It usually means the document was signed somewhere else, or this is a scan rather than the original file.
Behind the answer
What happens when you drop a file
Your browser fingerprints the file
The PDF is read right here on your device and reduced to a 64 character fingerprint. Only the fingerprint is sent to us, never the file, so a confidential contract is safe to check.
We look for that exact file
Change one character in a document and its fingerprint changes completely. A match means the file is, byte for byte, the one we sealed.
The record backs the answer
A genuine file comes back with its signers, its sealed audit trail, and its entry in the public log that anyone can check without trusting us.
What a match does and does not prove
It proves the file in front of you is the one DropTheDoc sealed when the last person signed, and it shows who signed and when, from the record we kept at the time. It does not prove who was sitting at the keyboard. That is true of every electronic signature, and our e-sign disclosure says exactly what ours is and is not.
Want your documents protected like this?
Everything you send or sign on DropTheDoc gets the same seal, certificate and public record. Automatically, on the free plan too.