PQCServer — Sign Document

Cryptographic Timestamp

Sign a document

Sign any file or text with your ML-DSA private key. PQCServer records the signature and timestamp — creating a verifiable certificate anyone can check. Your document never leaves your browser.

How it works: Your browser computes a SHA-256 hash of the document, signs it with your ML-DSA key, and sends only the hash + signature to PQCServer. The document itself is never uploaded. Anyone can verify the certificate using the public key.

1 — Document to sign

Upload a file

📄

Click to select or drag & drop
PDF, DOCX, TXT, images — any file type

— or sign a text message directly —

Text to sign (optional — used if no file selected)

2 — Your identity

Display name (appears on certificate)

Your ML-DSA Private Key ⚠ never shared

Don't have a key yet? Generate your ML-DSA keypair → Your private key is used locally and never transmitted to PQCServer.

Your ML-DSA Public Key (included in certificate)