Best open-source alternatives to DocuSign

DocuSeal is an open source document signing and form-filling platform aimed at teams and businesses that need to create, distribute, and process PDF-based workflows. It provides a web interface for building fillable PDF forms, collecting responses, and managing signatures on any device with a mobile-optimized experience. The project can be self-hosted and deployed through Docker or Docker Compose, with examples for running it on a private server and under a custom domain. It supports common storage backends, email delivery via SMTP, and an API/webhooks model for integration into other applications. The README also notes enterprise-style capabilities such as user management and pro features like SSO/SAML, reminders, bulk sending, and embedded signing components.

Documenso is an open-source document-signing platform intended as a self-hostable alternative to DocuSign. The README emphasizes trust, transparency, and control, encouraging users to run the software themselves and review how it works under the hood. It is aimed at teams and organizations that want digital signing infrastructure they can own and operate. The project is built with TypeScript, React Router, Prisma, Tailwind, shadcn/ui, tRPC, and related PDF tooling. It can be run locally for development with Node.js and PostgreSQL, or deployed via Docker containers pulled from DockerHub or GitHub Container Registry. The README also points to an Enterprise plan for large organizations, suggesting additional flexibility and control beyond the self-hosted version.

OpenSign is an open source document e-signing platform positioned as an alternative to DocuSign and other commercial signing services. It is designed for teams and individuals who need to send, sign, annotate, and manage PDF documents in a self-hosted or cloud-hosted environment. The project includes core signing workflows such as inviting multiple signers, signing in sequence, using templates, and managing documents in a centralized drive. It also adds security and compliance-oriented features like guest signer OTP verification, audit trails, completion certificates, and customizable email notifications. The README also highlights an API and third-party integrations, making it suitable for organizations that want to embed signing into existing systems.

Signature PDF is a web application for working with PDF files in a browser. It targets users who need to sign documents, reorganize pages, edit metadata, and compress files without relying on a desktop PDF editor. The project supports collaborative signing, including a multi-signature mode where multiple people can sign the same PDF. It also includes options for storing uploaded PDFs on the server, encrypting those stored files, customizing retention periods, and defining default metadata fields. Installation is documented for Debian/Ubuntu, Docker, Alpine Linux, and package-based deployment, and the README lists several public instances where the software can be used directly.