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Last Updated: 08-21-2026 03:50 AM (UTC)

OpenSign

With 6,700 GitHub stars, 79 releases, and 40 contributors since its October 2023 launch, OpenSign delivers a fully free electronic signature platform that removes the per-envelope pricing and seat limits of commercial e-signing services. The React-based frontend provides a drag-and-drop interface for placing signature fields, initials, date stamps, text inputs, and checkboxes onto PDF documents, while the Parse Server backend built on Node.js handles document routing through configurable multi-signer workflows with sequential or parallel signing order. Guest signers authenticate via one-time-password email verification without requiring account creation, while registered users manage documents through OpenSign Drive — a centralized vault with folder organization and status tracking across draft, in-progress, completed, and declined states. Every signing action generates tamper-proof audit trails logging timestamps, IP addresses, email addresses, and phone numbers, culminating in a detailed completion certificate attached to the finished document. The REST API v1.2 exposes endpoints for document creation, template dispatch, self-signing, and real-time webhook notifications on document lifecycle events, with regional deployments available in US and EU. PDF templates with pre-placed widgets enable repeated dispatch to different signers in a single API call. Custom branding controls email invitation templates, signing page appearance, and completion certificate styling. Deploy via Docker Compose with MongoDB, Caddy reverse proxy, and automatic HTTPS provisioning. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3 licensed.

OpenSign
OpenSign
OpenSign
OpenSign
OpenSign

Benefits

  • Unlimited Free Document Signing
  • Signs unlimited PDF documents without per-envelope pricing or seat limits, providing the same core e-signature workflow as DocuSign and PandaDoc at zero cost.
  • Legally Compliant Audit Trails
  • Records timestamps, IP addresses, email IDs, and phone numbers for every signing action, generating tamper-proof completion certificates aligned with ESIGN, UETA, and eIDAS standards.
  • Full REST API with Webhooks
  • Exposes RESTful endpoints for document creation, template dispatch, and signer management with real-time webhook notifications for embedding e-signatures into any application workflow.
  • Complete Data Sovereignty
  • Self-hosts all document storage and signing infrastructure on your own server with MongoDB, ensuring sensitive contracts never leave your controlled environment with full encryption.

Features

  • Drag-and-Drop Signing
  • Places signature fields, initials, dates, text inputs, and checkboxes onto PDF documents with a visual editor supporting multi-signer field assignment.
  • Multi-Signer Workflows
  • Routes documents through sequential or parallel signing order with OTP email verification for guest signers and configurable reminders and expiration dates.
  • Reusable Templates
  • Creates PDF templates with pre-placed widgets and role-based field assignments for repeated dispatch to different signers via the UI or API.
  • OpenSign Drive
  • Centralized document vault with folder organization, status filtering, search, and version tracking across draft, in-progress, completed, and declined documents.
  • Completion Certificates
  • Generates tamper-proof certificates for every completed document containing full access logs, signer details, timestamps, and IP addresses for legal compliance.