Subnoto : Confidential electronic signatures

E-signatures have a privacy problem.

Every traditional e-signature tool processes your documents in plaintext on their servers. When you sign an HR contract, NDA, or M&A agreement, you’re forced to trust that sensitive data won’t be exposed during server-side processing.

Subnoto is the only e-signature platform that keeps your documents encrypted even during server-side processing. Using confidential computing, we provide cryptographic proof that your contracts remain private and isolated at all times—even from our own infrastructure.

The result? Confidentiality without sacrificing the simplicity and speed you expect from modern e-signature tools.

Subnoto is for everyone: privacy enthusiasts, yes, but also any team or independent professional simply looking for a reliable and accessible solution. We also develop APIs designed for developers and software publishers to integrate e-signatures without compromising their users’ confidentiality.

Whether you handle sensitive documents daily, develop tools requiring signatures, or simply seek a trusted e-signature alternative, Subnoto is here.