UD Signer
Sign any document — PDF, DOCX, UDS, UDR, or any file. Generates a cryptographic .udsig companion file as verifiable proof. Free forever.
🔏
Drop any document here
PDF · DOCX · UDS · UDR · TXT · CSV · any file
📄
Embeds signer metadata into the PDF and generates a .udsig companion.
📝
DOCX / any file
Generates a .udsig JSON companion with SHA-256 hash and signature record.
📋
UDR
Sign and keep as UDR — or sign and seal into a UDS in one step.
🔒
UDS
Add co-signatures to an already-sealed Universal Document™.
UD Signer runs locally in your browser. 3 free signatures per month.