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Legalesign API
What Legalesign API is
Legalesign API provides programmatic access to Legalesign features for signing, witnessing, and approving documents. Its offering includes REST and GraphQL APIs, an SDK, real-time webhooks, WebSockets, and a component and UI library. Documents can be routed to as many as 99 recipients. PDF workflows support uploads, field placement with text markers or coordinates, reusable and customizable files, and previews before sending. Signing pages can be embedded on a website, placed on a custom domain, and paired with your own signer communications instead of Legalesign emails. Listed integrations include Salesforce, Microsoft Power Automate, Voyager Infinity, LogicMelon, Recruitly, and Timesheet Portal. Legalesign states that it has ISO 27001 certification since 2016 and Cyber Essentials Plus since 2022. It says data is encrypted in transit and at rest, with tamper-proof PDFs and long-term validation. Two-factor authentication is standard. API development approval is required before credentials are generated. Plans include Pay As You Go at £1.50 per month, a 14-day trial, and no free plan.
Who it suits
It suits organizations that need document signing, witnessing, or approval inside their own systems. Developers should note that API access requires approval and complex embedded forms may work poorly on mobile devices.
What it does well
- REST and GraphQL APIs with SDK
- Supports up to 99 recipients
- Embeddable signing pages and custom domains
- Real-time webhooks and WebSockets
- Two-factor authentication included
What to know first
- No free plan
- API credentials require prior approval
- Complex mobile forms may not work well
- Sandbox REST API limited to 100 calls hourly
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Solo Basic | £10/month (ex VAT) · 1 user · 20 documents/month fair use · 10 templates · API | £10 a month |
| Solo Pro | £25/month (ex VAT) · 1 user · 100 documents/month fair use · unlimited templates · API | £25 a month |
| Team | £15/user/month (ex VAT) · 2–5 users · 100 documents/user/month fair use · unlimited templates · API | £15 a month |
| Pay As You Go | £1.50 per sent-document · 1 user · 5 templates · API | £1.50, paid once |
| 5+ users & Enterprise | Flexible pricing · Per-document and/or per-user pricing · high volume pricing · SSO · multiple teams · SLA | On request |
As legalesign.com lists them, read 30 Sept 2026. The maker's own page has the final word.
Verdict
Legalesign API combines document workflows with embedding, integrations, and live event reporting. Its approval requirement and mobile-form limitation are important considerations for implementation.
Facts from Legalesign API's own pages
- API access
- Users must be approved for API development before they can generate API credentials. · docs.legalesign.com, 30 Sept 2026
- API options
- The API offering comprises REST and GraphQL APIs, an SDK, real-time webhooks, and a component and UI library. · legalesign.com, 30 Sept 2026
- Authentication
- Two-factor authentication is available as standard, while OpenID single sign-on is available to enterprise customers. · legalesign.com, 30 Sept 2026
- Bulk sending
- Yes · legalesign.com, 20 Sept 2026
- Data protection
- Legalesign says it encrypts data at rest and in transit and creates tamper-proof PDFs with certification and long-term validation. · legalesign.com, 30 Sept 2026
- Embedded signing
- The API can embed signing pages on a website, use a custom domain, and suppress Legalesign emails in favor of custom signer communications. · legalesign.com, 30 Sept 2026
- Founded
- 2012 · legalesign.com, 28 Sept 2026
- Free plan
- No · legalesign.com, 20 Sept 2026
- Integrations
- Legalesign lists integrations including Salesforce, Microsoft Power Automate, Voyager Infinity, LogicMelon, Recruitly, and Timesheet Portal. · legalesign.com, 30 Sept 2026
- Intended customers
- Legalesign says it serves organizations of all sizes, from PLCs to sole traders, in both public and private sectors. · legalesign.com, 30 Sept 2026
- Live events
- Webhooks or WebSockets can report events in real time to support live dashboards and synchronized data. · legalesign.com, 30 Sept 2026
- Mobile embedding limitation
- Legalesign says embedded PDF signing works best on desktop and that complex forms in mobile contexts, especially iPhones, may not work well. · docs.legalesign.com, 30 Sept 2026
- PDF workflows
- Users can upload PDFs, add fields with text markers or coordinates, reuse and customize PDFs, and preview them before sending. · legalesign.com, 30 Sept 2026
- Purpose
- The API provides programmatic access to Legalesign platform features for signing, witnessing, and approving documents. · legalesign.com, 30 Sept 2026
- Recipients
- A document can be sent for signature, witnessing, or approval by up to 99 recipients. · legalesign.com, 30 Sept 2026
- Sandbox limit
- The REST API sandbox is throttled to 100 calls per hour, and the documentation says recipient email addresses are unrestricted in sandbox mode. · docs.legalesign.com, 30 Sept 2026
- Security certifications
- Legalesign states that it has been ISO 27001 certified since 2016 and Cyber Essentials Plus certified since 2022. · legalesign.com, 30 Sept 2026
- Support
- The API page directs developers to Legalesign's support team and offers API demos; the pricing comparison lists online documentation across plans and email support on Solo Pro, Team, and Enterprise. · legalesign.com, 30 Sept 2026
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