E-Signature API for Developers
Embed legally binding signing into your product with the OpenSign API. Open source, well-documented and built to scale.
A flagship open-source product from the Qik family.
OpenSign gives developers a clean REST API to create signature requests, manage templates and react to signing events with webhooks — so you can embed signing directly inside your own product.
Because the platform is open source, you can run it on your own infrastructure, audit the code, and avoid the rate limits and per-call pricing of proprietary APIs.
Key capabilities
REST API
Create documents, add recipients and send for signature programmatically.
Webhooks
Receive real-time events when documents are viewed, signed or completed.
Template API
Generate signature requests from reusable templates at scale.
Self-hosted
Keep signing infrastructure and data inside your own cloud.
Build signing into any workflow
From SaaS onboarding flows to automated contract generation, the OpenSign API lets you trigger signing without sending users to a third-party site. Pre-fill fields, set signing order and capture completed documents automatically.
Frequently asked questions
Does OpenSign have an API?
Yes. OpenSign exposes a REST API and webhooks so you can integrate e-signatures into your own applications and workflows.
Is the OpenSign API free?
OpenSign is open source, so you can self-host and use the API without per-call fees. A managed option is also available.