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OpenSign
What it is
OpenSign is an open-source PDF e-signature solution for signing, storing, and securing documents. Users can create reusable templates with pre-placed widgets and send them to signers; API workflows include self-signing, drafts, signer roles, public template links, and real-time webhook notifications. Templates can be embedded in React, Next.js, HTML, JavaScript, and Angular projects. The documentation lists TLS-encrypted transport, audit trails, IP logging, and signed PDFs designed to reveal tampering. Account protection includes two-factor authentication and passkey sign-in. The free plan includes unlimited digital signatures and templates, completion certificates, sequential signing, OpenSign Drive, and email notifications. However, the maker’s free-plan guide limits invitation emails to 15 per month, while bulk sending and public links require a paid plan. Live API tokens require Professional or Teams, although sandbox tokens are available on all plans. Docker self-hosting instructions cover Linux, macOS, and Windows. Users can configure SMTP, including Gmail and third-party providers, though some SMTP features are limited to paid plans. The documentation describes OpenSign as designed for individuals and businesses, from startups to large corporations.
For and against
For
- Free plan includes unlimited digital signatures
- Reusable templates with pre-placed widgets
- Supports audit trails and IP logging
- Offers two-factor authentication and passkey sign-in
- Docker self-hosting instructions cover three operating systems
Against
- Free plan limits invitations to 15 emails monthly
- Bulk sending and public links require a paid plan
- Live API tokens require Professional or Teams
- Some SMTP features are limited to paid plans
The verdict
OpenSign provides document signing and template workflows, with a free plan that includes unlimited signatures. Invitation email, bulk sending, public link, SMTP, and live API requirements may determine whether a paid plan is needed.
Who it suits
OpenSign may suit individuals and businesses that need document signing, reusable templates, or API-based signing workflows. Teams embedding templates or using live API tokens should account for the plan requirements.
Plans and prices
Free
Unlimited digital signatures · Unlimited templates · Completion certificates · Sequential signing
Read 15 Oct 2026 · www-opensignlabs-com.filesusr.com
Professional
Field validations · Calculated fields · Webhooks · Zapier integration
Read 15 Oct 2026 · www-opensignlabs-com.filesusr.com
Teams
Everything in Professional · Up to 500 API signatures included · Team features
Read 15 Oct 2026 · www-opensignlabs-com.filesusr.com
Enterprise
Custom domain · Whitelabeling · Uptime SLA · SSO support
Read 15 Oct 2026 · www-opensignlabs-com.filesusr.com
On the record
- Account protection
- OpenSign provides two-factor authentication and passkey sign-in options.docs.opensignlabs.com · read 9 Oct 2026
- API
- OpenSign exposes a REST API authenticated with an x-api-token header and provides sandbox, production and EU endpoints.docs.opensignlabs.com · read 15 Oct 2026
- API access
- Yesopensignlabs.com · read 20 Sep 2026
- API capabilities
- The API can create, send, update, revoke and delete documents, manage templates, contacts and folders, and receive webhooks.docs.opensignlabs.com · read 15 Oct 2026
- API compatibility
- The v1.2 API states that it is backward compatible with v1 and v1.1 and keeps earlier endpoints available.docs.opensignlabs.com · read 15 Oct 2026
- API extensibility
- API v1.2 adds attachment widgets, password-protected PDFs, offline-signing controls, signer roles and carbon-copy recipients.docs.opensignlabs.com · read 15 Oct 2026
- API limit
- Live API tokens require a Professional or Teams plan, while sandbox tokens are available on all plans.docs.opensignlabs.com · read 9 Oct 2026
- Audit trail
- Yesopensignlabs.com · read 20 Sep 2026
- Bulk sending
- Yesopensignlabs.com · read 20 Sep 2026
- Company founding
- The LinkedIn company page does not state a founding year.linkedin.com · read 15 Oct 2026
- Company headquarters and size
- LinkedIn lists OpenSign Labs as privately held, headquartered in New York, with 2–10 employees.linkedin.com · read 15 Oct 2026
- Company identity
- The privacy policy identifies Qik Innovations Private Limited as the operator of OpenSign.opensignlabs.com · read 15 Oct 2026
- Completion certificates
- Version 1.5.0 added an automatically digitally signed completion certificate after all signers finish.opensignlabs.com · read 15 Oct 2026
- Documentation
- The official documentation includes user help, API references, contribution guidance and self-hosting instructions.docs.opensignlabs.com · read 15 Oct 2026
- Document templates
- Yesopensignlabs.com · read 20 Sep 2026
- Document widgets
- The product supports signature, initials, text, date, checkbox, stamp and number widgets, with number calculations.docs.opensignlabs.com · read 15 Oct 2026
- Users can configure SMTP, including Gmail and third-party SMTP providers, and some SMTP features are limited to paid plans.docs.opensignlabs.com · read 9 Oct 2026
- Expiring links
- Signed PDF download links are designed to expire after a few minutes.opensignlabs.com · read 15 Oct 2026
