Verify a document
Upload the PDF. Its digest is recomputed from the bytes you supply and compared with the digest that was signed — if a single byte has changed, they will not match.
Upload the PDF
This is all you need for a document signed through this portal.
Drag a PDF here, or
PDF only, up to 10 MB
Signature file
Only needed for a document this portal has never held — a file someone sent you, or one signed in a previous session.
Only needed for a PDF that carries no signature of its own — a signed PDF downloaded from this portal is checked against the signature embedded inside it. A detached signature lives beside the document instead, so attach the .sig.json file downloaded at signing time.