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OpenSignSignature PDF
Freemium

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

 Free

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

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

Checked September 22, 2026

Checked October 2, 2026

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