Subnoto is an electronic signature platform designed to ensure confidentiality and privacy throughout the signing process. The service emphasizes that documents remain confidential even during signing, with no access granted to Subnoto, third parties, or governments. It employs confidential computing, trusted execution environments (TEEs), and advanced cryptographic methods to provide verifiable privacy guarantees and tamper-proof audit trails of document activity. Data is encrypted and processed within secure enclaves on Subnoto's own servers, which are hosted in France, aligning with European privacy and compliance standards.
The platform supports a variety of document formats, including PDF, DOCX, ODT, and RTF, with a maximum file size of 50 MB per document. Users can send and sign documents quickly, manage confidential workspaces accessible only to designated team members, and utilize passwordless signatures via fingerprint or Face ID. Real-time status tracking and automatic notifications are included to streamline workflows and help users meet deadlines. Subnoto is designed for use in most agreements and contracts, with electronic signatures that are legally valid in Europe. The platform also indicates plans to support eIDAS advanced and qualified electronic signatures in the future.
Integration options are a key feature, with a comprehensive REST API, official TypeScript and Python SDKs offering full type safety and built-in encryption, and real-time webhooks for automated notifications. Subnoto can be connected to external services such as CarboneIO, Zapier, n8n, and Raycast. The MCP Server feature allows AI assistants, like Claude and Cursor, to interact with Subnoto, enabling automation and integration with development environments. Developer documentation, tutorials, and guides are available to facilitate rapid integration into existing workflows.
Subnoto is accessible via a web application and offers free signing functionality. The platform is tailored for organizations and professionals seeking secure, private, and compliant electronic signature solutions, especially those operating within or serving the European market.
In the Legal & contract ops space, Subnoto takes a focused approach. Ensures confidential, secure, and legally valid e-signature workflows with privacy and cryptographic proof. Subnoto is a B2B product aimed at businesses and professionals needing secure e-signatures. A free plan is available. The product ships for the web, the command line, and API.
Behind Subnoto is Subnoto SAS, based in France, and the product first shipped in 2025. Among its 6 catalogued features are confidential e-signatures, cryptographic proof, and REST API. The interface is available in English and French. It exposes integrations via an MCP server, a public API, and a Zapier integration.
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