OpenSign

OpenSign enables electronic signatures on PDF documents. Templates, invitation links, and a definable order for multiple signers support recurring signing workflows.

The actively maintained open-source base is licensed under AGPL-3.0 and can be self-hosted. It uses JavaScript and MongoDB. The vendor also offers a hosted service.

Fact Sheet

Categories
Status
Actively maintained
License
  • AGPL-3.0
Operation
  • On-Premises / Self-hosted
  • SaaS
Technologies
  • JavaScript
  • MongoDB
Single Sign-On (SSO)
  • Unknown: not specified
MCP server
  • Unknown: not specified

Data last checked on October 19, 2026

Separately Licensed Components

The main license in the repository places the project's own code under AGPL-3.0 but excludes the apps/OpenSignServer/cloud/customRoute directory and refers to a license defined there. The AGPL-licensed parts remain open source and may also be used commercially under its terms.

The linked directory for the separately licensed components contains no corresponding license file. The sources cited therefore do not clarify the specific rights to use and redistribute these components. This reference does not imply any general restrictions for the AGPL core.

As a result, there is no reliable edition comparison that fully maps additional features to their license rights. Features of the hosted offering are therefore not generally attributed to the open core.

Open-Source Alternatives

In the Category «Electronic Signatures»

DocuSeal

DocuSeal creates fillable PDF forms and collects electronic signatures. Multiple people can fill in and sign the same document.

  • E-Signatures

Documenso

Documenso lets you sign documents electronically. You can self-host the application or use it as SaaS.

  • E-Signatures

Signature PDF

Signature PDF is an open-source web app for signing, compressing, and editing PDFs. You can run it on your own server.

  • E-Signatures
  • PDF