Verify

Verify a signed PDF.

Drop a signed document below to check whether it carries a digital signature. It runs entirely in your browser — your document never leaves this page and nothing is uploaded.

100% client-side — the file is read with your browser's FileReader, never transmitted.
What this check is — and isn't

This page is a convenience. It inspects the PDF's structure for the markers of a digital signature (a PAdES / PKCS#7 signature and its byte range) and gives you a plain-English read. It's handy for a quick "does this even carry a signature?" — but it is not a full cryptographic validation. It does not check the signing certificate's chain, revocation status, or the trust of the timestamp authority.

Because MostlySign seals with the open PAdES standard, you never have to take our word for anything — the same document validates fully in tools that specialise in it:

Full validation at the EU DSS validator …or open it in Adobe Acrobat Reader and read the signature panel.
Want to understand the seal itself? Read how trust is built in →