Build Exceptional eSignature API Integrations
Legalesign is API-first. Anything you can do in the enterprise web app, you can do via the API, with real-time webhooks and embeddable components for forms, PDF editing and signing.
Reliable at scale
REST or GraphQL
Embeddable components
The API has processed millions of documents and runs on high-scale, high-reliability systems. ISO 27001 and Cyber Essentials Plus certified.
Use the proven REST API for common eSignature workflows, or GraphQL for a feature-complete interface to Legalesign functionality.
Use Components to embed the PDF editor or signing pages for a seamless customer experience.
What is the API?
Legalesign API (application programming interface) comprises products that enable programmatic access to the features of the Legalesign Platform. The API comprises a REST API, GraphqQL API, SDK, Realtime Webhooks, and a Component and UI Library.
What can you do with the API?
Legalesign is API-First. Anything you can do within the Legalesign Web App, you can also do via the API. Components enable you to embed complex functions in your own systems. Either eSignature to your own systems for your end-customers, or use it to automate your organisation's in-house processes:
You can:
Send a PDF to be signed, witnessed, or approved by up to 99 recipients.
Upload a PDF and add form fields using either text markers or x/y coordinates.
Install the form editor in your own page.
Re-use a PDF and customise it upon sending.
Get a preview of your custom PDF before sending.
Embed the signing pages on your website or suppress Legalesign emails and use custom communication channels for signers.
Use your own domain for embedded signing pages.
Get all events reported back to a URL of your choice in real time with webhooks, or use websockets.
Add groups and users programmatically to model multiple discrete end-customer data environments (and optionally provide a Legalesign app to those users too).
Integrate with no-code solutions like MS Power Automate.
How does the API work?
The Legalesign API has several integration options to suit different applications.
Using a secure REST API your systems can communicate with Legalesign and trigger a host of functionality.
Website integration - provide a signing page within your own website.
Integrate into the Microsoft software suite via PowerAutomate.
Software integration - Create a seamless signing experience.
NHS CCG
"We finally found a product which offered all the features we wanted and the flexibility we needed at a realistic price. Legalesign was immediately easy to use and the development team provided exceptional levels of support. As a result, we were able to implement our full solution for generating and managing complex multi-party contracts very quickly and keep several business-critical projects on track. Feedback from end-users has been very positive... provides absolute clarity and assurance throughout the process. The ease with which we can now make updates to key legal documents means that this is no longer a bottleneck in our development process."
Carl D
G2 Review
"I've integrated Legalesign into a CMS product. The use case was for users to have to sign an NDA before gaining full access to the system. I managed to do this with ease using the Legalesign REST API such that the entire process of user sign-up, NDA signing and granting full access to the system is entirely automated. Their support team are knowledgable on development related issues and are very responsive. I also trialled Adobe EchoSign... and without a doubt, Legalesign most definitely represent the best solution when it comes to features, flexibility and robustness versus pricing."
Developer
Cloudbase
"Integrating Legalesign via its API into a customers solution worked flawlessly."
Trevor Gildesleeve
Owner
Ready to start your integration?
To start developing or using a Legalesign Plugin just sign up for a free trial, go through to the Developer Portal, generate your API key and start coding. Don't forget to use our MCP tooling to make integrating with AI easy.
Key Features
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eSignature API FAQs
Frequently asked questions about eSignature API and Legalesign.
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