To check a signed PDF, go to app.signwren.com/check and choose the file. If it matches, you’ll see “This matches a document SignWren sealed on” followed by the date. You don’t need an account, and the PDF itself never leaves your device.
How does the check work without uploading my file?
Your browser works out the file’s SHA-256 fingerprint, a 64-character code that changes completely if even one byte of the file changes, and sends only that. SignWren looks for a finished document with the same fingerprint. A match tells you the date it was sealed and nothing else: no title, no names, no account.
What does “No match” mean?
Either the file isn’t one SignWren sealed, or it has been changed since. The answer is the same in both cases on purpose, and a document that was deleted from SignWren gives the same answer too.
A real copy can stop matching for boring reasons. Saving it again, printing it to PDF, or adding a note in a PDF app makes a new file with a new fingerprint, even if the pages look identical. Try the copy that was emailed to you, or download it again from the link in that email.
What doesn’t a match tell me?
A match only says the file is exactly what SignWren sealed. It doesn’t say whether the agreement is valid or enforceable, and the check page doesn’t tell you who signed. For that, open the certificate of completion at the end of the PDF.
Can I check the seal without SignWren?
Yes. The finished PDF carries a digital signature, so a PDF reader that shows signature details can tell you whether the file has changed since it was signed, without visiting our site. Our guide on how to check if a signed PDF was altered shows where to look in common PDF readers.
Is there a limit on checks?
Up to 30 checks a minute from one connection. That’s plenty for anyone checking their own files, and it makes it impractical to guess at fingerprints in bulk.