Verify a sealed document

Every document Seal completes is sealed with a timestamped digital signature. Check one here: the check runs in your browser, the PDF is never uploaded, and Seal only looks up its SHA-256 hash.

Look up an envelope

Adobe Acrobat also shows a sealed document as signed and unmodified; it warns that Seal's certificate isn't in its trust list unless you add Seal's root certificate.About Seal's certificates.