Sign PDFs and files with a real certificate or key pair, stamp them with a mark placed exactly where it belongs, and let anyone verify the result in one check. AuthPDF is opening its doors soon — to people signing one file, and to systems signing thousands.
Bring a .pfx, a PEM key pair, or generate a certificate on the spot — the signature embeds straight into the PDF, byte range and all.
Anyone with the document and the certificate can confirm nothing changed since it was signed — no account needed to check.
Upload a signature image or pick a built-in one, then drag it to the precise page and point — signature block, margin, or stamp corner.
A metered signing and verification API for systems that need to sign documents without ever opening AuthPDF's own page.