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Signature PDFOpenSign
Free

Free and open source under the AGPL-3.0 licence, with free public instances.

 Freemium

The open-source software is free to self-host. A hosted plan is paid.

Web, Self-hosted Web, Self-hosted
  • Multi-person signing mode
  • Page organising, metadata editing and compression in one tool
  • Self-hostable, so signed documents and audit trails stay with you
  • Templates, signing order and an API for integration
  • Multi-signature mode stores PDFs on the server
  • Signatures are visual, not certificate-based
  • Legal weight of signatures depends on your jurisdiction and configuration
  • Younger and less polished than the commercial services
Web application, Self-hosted Self-hosted, Web application
Open source Open source
License: AGPL-3.0 License not stated
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.