OpenSign review
A capable open-source signing platform with strong automation and limited integrations.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
OpenSign is an open-source electronic-signature platform for individuals, teams, developers, and organizations that need to send, sign, store, and manage PDF documents. It supports drawn, typed, uploaded, and saved signatures, reusable templates, multiple signers, sequential or simultaneous signing, completion certificates, audit trails, and email OTP verification for guest signers. The web, API, and self-hosted options make it particularly relevant to self-hosters and teams that want control over deployment and document workflows.
Its plan structure is straightforward. The Free plan includes unlimited e-signatures, completion certificates with access logs, and document storage and organization. Professional adds 100 monthly credits, bulk sending, and API and public-link workflows. Bulk sending can use templates and CSV imports, while the REST API supports document, template, signer, and workflow automation. Dropbox and Zapier are the listed integrations, so organizations expecting a broad prebuilt integration ecosystem may need to rely more heavily on the API or custom workflows.
OpenSign’s strongest distinction is the combination of open-source deployment and workflow depth. Self-hosted deployment is available under the AGPL-3 license, and embedded signing, public signing links, routing, audit trails, and completion certificates cover more than basic signature collection. Email OTP provides a documented guest-signer verification method, but SMS authentication is not part of the offering. Choose OpenSign if free access, self-hosting, templates, and programmable signing matter most. Consider another option if you need SMS verification or a wider set of native integrations.
OpenSign pros and cons
- Where it wins
- Free plan includes unlimited e-signatures and completion certificates.
- Supports templates, routing, bulk sending, embedded signing, and public links.
- REST API and self-hosting support automation and deployment control.
- Where it doesn't
- Signer verification is email OTP rather than SMS authentication.
- Listed integrations are limited to Dropbox and Zapier.
- Professional includes 100 monthly credits for paid workflows.
OpenSign fact sheet, pricing and score →
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