OpenSign

OpenSign is an open-source, self-hosted web application and server that provides a platform for electronic document signing. It allows users to send, sign, and manage PDF documents digitally without relying on proprietary commercial software. The platform is designed to democratize the document signing process, making it accessible for businesses and individuals who need a secure way to execute agreements remotely.

The software is deployed as a web application and can be installed on a private server using Docker. It serves as a centralized system for handling legal documents, offering tools for both the sender and the signer to complete agreements via a web browser. By hosting the server locally, users maintain control over their data and document storage rather than relying on a third party cloud provider.

Key features

• Support for hand drawn, typed, and uploaded image signatures
• Multi-signer workflows with sequential signing enforcement
• OTP email verification for guest signers to ensure identity
• Document expiration dates and signer rejection options
• Creation and storage of PDF templates for repeated use
• Audit trails including timestamps, IP addresses, and completion certificates
• Centralized document vault called OpenSign Drive
• API access for integration into external software systems
• Integration with Zapier and various cloud storage providers

The application is built using a JavaScript stack consisting of Node.js and React, with MongoDB used for data storage. It is designed for businesses and individuals who require a private environment for document execution. The system includes customizable email templates for invitations and notifications, ensuring that the communication sent to signers matches the branding or requirements of the sender. For developers, the platform provides a structured API and documentation to automate signing processes and integrate the service into existing enterprise platforms or CRMs.

OpenSign is licensed under the AGPL-3.