OpenSign
Free, open-source e-signature platform and DocuSign alternative for signing PDF documents.
About OpenSign
OpenSign is a free, open-source e-signature platform and a self-hosted alternative to DocuSign, PandaDoc, and Adobe Sign. It lets you send, sign, and manage PDF documents with hand-drawn, typed, or uploaded signatures.
It supports multi-signer workflows with sequential signing, OTP email verification for guest signers, expiring documents, and rejection with reasons. Reusable PDF templates, a central document vault (OpenSign Drive), and detailed audit trails with a completion certificate make it production-ready.
Released under the AGPL-3.0 license, OpenSign deploys with Docker and MongoDB, and includes a REST API plus Zapier and cloud-storage integrations for automating signing into your existing systems.
Key Features
- Secure PDF e-signing with hand-drawn, typed, or uploaded signatures
- Multi-signer workflows with sequential signing and OTP verification
- Reusable templates, document vault, and expiring documents
- Audit trails, completion certificates, and a REST API
Self-Hosting Notes
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