E-Signature · Vendor site 2026-10-04
OpenSign is an open source PDF e-signature platform positioned as an alternative to commercial signing tools. It offers unlimited free signatures, multi-party signing, completion certificates with access logs, secure document storage in OpenSign Drive, self-hosting, and developer API documentation from OpenSign Labs.
Individuals and organizations that want open source, self-hostable digital signing with a no-cost tier for core signing workflows.
Marketing focuses on the free plan and open source deployment; no monthly USD paid tiers are listed on the main homepage.
OpenSign Labs promotes OpenSign as an open source PDF e-signature solution with unlimited free signing, collaboration, certificates, and secure document storage.
What it can do
Unknown is different from unavailable. Each fact carries its own evidence.
| Capability | Value | Evidence | Checked |
|---|---|---|---|
| Unlimited free signatures | Homepage headline plan advertises unlimited digital signatures at no cost. | Facts sourced | 2026-10-04 |
| Completion certificates | Site states signed documents include detailed completion certificates with access logs for free. | Facts sourced | 2026-10-04 |
| Self-host option | Navigation links to GitHub, docs, API, and self-host resources for running OpenSign yourself. | Facts sourced | 2026-10-04 |
Understand the total cost
Free
Free
Homepage promotes a free plan with unlimited e-signatures, free invites, free completion certificates, and free secure document storage.
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OpenSign is an open source PDF e-signature platform positioned as an alternative to commercial signing tools. It offers unlimited free signatures, multi-party signing, completion certificates with access logs, secure document storage in OpenSign Drive, self-hosting, and developer API documentation from OpenSign Labs.
Homepage promotes a free plan with unlimited e-signatures, free invites, free completion certificates, and free secure document storage.. This record lists ongoing free access; check the plan limits before starting.
No paid monthly price is listed; this record treats the product as free to start. See the plan cards for entitlements, billing commitments and seat minimums.
Official OpenSign docs site advertises API documentation, self-host guides, and cloud resources for integrators.. API access and subscription access may have different terms; consult the linked sources.
Marketing focuses on the free plan and open source deployment; no monthly USD paid tiers are listed on the main homepage.
No retained pricing changes yet. A current price alone does not establish a historical trend.
Reviewed vendor source
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