The short answer: the best free eSignature software for small business is OpenSign™ — it offers unlimited self-signing, reusable templates, multi-user teams and an API at no cost, with no per-seat pricing. It's open source, so you can also self-host as you grow.
What small businesses need from eSignatures
- Low or no cost — every dollar counts for a small team.
- Templates — reuse contracts, invoices and forms.
- Multiple users — let your whole team send documents.
- Professionalism — a clean signing experience for clients.
- Legality — binding signatures with an audit trail.
OpenSign delivers all of these for free.
Why OpenSign fits SMBs and startups
| Need | OpenSign™ |
|---|---|
| Cost | Free core features, no per-seat fees |
| Templates & bulk send | Included |
| Team accounts & SSO | Yes |
| API for automation | Yes |
| Self-hosting as you scale | Yes |
Common small-business use cases
- Client contracts and statements of work
- Quotes, invoices and approvals
- Freelancer and contractor agreements
- NDAs — see our free NDA template
Getting started
Create a free account at OpenSign, build your first template, and start sending. Compare it with paid tools in DocuSign alternatives.
Ready to try it? Create a free OpenSign account and start signing documents in minutes — no credit card required. Prefer to run it yourself? OpenSign is 100% open source on GitHub.