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Get secure, compliant digital signatures in seconds.

Easily collect staff, customer, or patient data with compliant digital forms.

Merge data from multiple sources and generate fillable documents with ease.

Integrate signatures, forms, documents, and workflows into your native apps in minutes.

Help your departments work faster with eSignatures, forms, and documents connected by intelligent workflows.

Featured News
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OnTask Launches eSignature API to Connect eSign Capabilities

Paying too much for DocuSign, HelloSign or another eSig provider? Switch for 50% off!

OnTask’s eSignature API: Enhance Your Application

An eSignature API built to fill the gaps in your application in minutes and get to market faster. 

An Electronic Signature API Your Way

Building secure, compliant, and legally binding eSignature capabilities into your software takes up valuable time and development resources.

Get that time back and avoid development headaches with a secure, proven API solution backed by the support, documentation, and resources of a software company with three decades of experience.

Pay-as-you-go Pricing Per eSign

1-1000 transactions / month

$1.87 per transaction

1001-5000 transactions / month

$1.74 per transaction

5000+ transactions  / month

$1.49 per transaction

Discount and user-based pricing available. 

Advanced features such as custom workflows, custom SMTP, white labeling, embedding, and SMS are available.

Get Started with Developer Resources

Get started in a snap with Sample Code

Try OnTask API in your favorite coding language.

Upload Document
Send Document For Signing
Get Document Status
Download Signed Documents

I think the combination of all that they bring to the table in a mature capacity is the reason to do business with them. They didn’t just invent something yesterday and hope it’s working. They have tried and true platforms and people who understand the business and how to make things work.

John McGowan
CEO of HubSync
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The Benefits of Buying vs. Building an eSign API

To build or to buy can be a hard question to answer. See how the benefits stack up in our latest eSign API-focused whitepaper.

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Bring eSignatures Full Circle with Robust Workflows

Legally Binding eSignatures

Collect legally binding, HIPAA-compliant eSignatures from any device.

Progress Tracking

Track signature status as documents flow through review.

Collect, Populate, & Generate Documents

Use digital forms to collect info from users to populate pre existing documents or generate new ones.

Built-In Notifications

Automatically route documents to proper parties using emails and SMS texts.

Quick Integrations

Easily connect with thousands of apps using webhooks and in-app integrations.

Reusable Templates

Quickly automate processes by getting started with a pre-built template.

Why Choose OnTask API?

OnTask API connects eSignatures with forms and workflows to bring you an end-to-end solution for automating processes.

  • 30+ Years in the Business
  • Scales with Your Team
  • Proven Reliability
  • Quick Error Response
  • Transparent Pricing
  • Robust Documentation

OnTask API Business Benefits

Seamless User Experience

Integrate forms and signature features directly into applications to create a consistent user experience.

Unrivaled Support

Extensive documentation and proactive customer support help to overcome any implementation challenges.

Get to Market Faster

Save time and resources by incorporating proven functionality into applications rather than building from scratch.

Secure and Compliant

HIPAA, FERPA, SOC2, & CCPA compliant with legally binding signatures and electronic audit trails for enhanced security.

Get Started in Minutes

Integrate versatile forms, documents, and signature capabilities and start creating API calls in a matter of minutes.

Do More with Our eSignature API

Built for Developers

Fast API Error Response

Consistent infrastructure monitoring with automatic reminders notify our team to minimize downtime and errors.

Clear Documentation

Concise, straightforward documentation for using and integrating OnTask API into applications.

Built to Last

OnTask API is flexible to changing needs with easy editing and scalability as your business grows.

Maintains Backward Compatibility

As updates are made, backward compatibility is maintained to ensure continuous functionality.

Frequently Asked Questions

What compliances does the OnTask eSign API meet?

OnTask API is HIPAA, FERPA, SOC 2, and CCPA compliant, and features a number of security features to protect data and combat downtime. Read about OnTask’s security and compliance.

What use cases does the API support?

OnTask API can be used for a wide variety of use cases, including but not limited to leasing packets, employee and client onboarding, proposals, quotes, questionnaires, and any other process using forms and documents.

What capabilities does the API have?

OnTask API’s abilities include eSignature requests and collection on documents, document packet creation, automated document generation, document lifecycle management and storage, data collection through forms, automatic launching of workflows, as well as importing and exporting documents and data from other systems.

How long does it take to launch the API?

Our eSignature API comes with extensive documentation that allows developers to implement and launch within a matter of minutes. Support is available during and after implementation, as well as

eSignature vs. digital signature API, what’s the difference?

The purpose of an eSignature is to verify a document, while digital signatures also work to secure documents. OnTask utilizes both for a complete signature experience. Read more on the difference between eSignature and digital signature APIs.

What is an eSignature API?

An eSignature (electronic signature or digital signature) application programming interface (API) is a Representational State Transfer (REST) web service that allows subscribers to securely request signatures online, obtain status updates, and download the completed documents.

Request Your Custom API Solution

Every business has different needs, but we’re here to help. Tell us a little more about what you’re looking for, and we’ll advise you on the best solution for you.