Viewer API

PDF Viewer API pricing

Embed interactive document viewing, annotation, and signing in your application. Viewer sessions apply to DWS-managed documents and app-provided documents.

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Document viewing and editing

Annotations and forms

Electronic signatures

HTTPS encryption

Secure document storage

Each plan also includes quotas for DWS-managed documents — Free: 100 documents, 500 MiB storage, 100 monthly uploads · Starter: 5,000 documents, 1,024 MiB storage, 5,000 monthly uploads · Growth: 10,000 documents, 5,120 MiB storage, 10,000 monthly uploads. Quotas apply only to DWS-managed documents; app-provided documents use viewer sessions only.


Frequently asked questions

What is DWS Viewer API?

DWS Viewer API enables you to embed a fully featured document viewer into your application. It supports viewing, annotation, form filling, and signing directly in the browser.

How is usage measured for Viewer API?

Usage is typically measured by viewer sessions — each time a document is loaded and interacted with in your application.

What is a viewer session?

A viewer session represents a single instance of a document being opened in the viewer. This includes rendering the document and enabling user interactions like scrolling, annotating, or signing.

Do I need a backend to use Viewer API?

No. Viewer API can be used without managing backend infrastructure. It’s designed to render documents directly in the browser using cloud-based services.

Can I customize the viewer?

Yes. Viewer API is highly customizable. You can control the UI, enable or disable features, and integrate it with your application’s workflows.

Does Viewer API support annotations and signatures?

Yes. You can enable features such as annotations, comments, form filling, and electronic signatures directly within the viewer.

What happens when I run out of viewer sessions?

With pay-as-you-go, exceeding your monthly viewer sessions doesn’t interrupt your app. We pre-authorize charges in $25 increments and add sessions as you use them, up to a spending cap you control (by default, half your monthly subscription value) — we never charge beyond it. Set the cap to $0 to stop at your monthly limit. Pay-as-you-go is available on paid subscriptions only.

Is the Viewer API secure and compliant?

Yes. The Viewer API is built with enterprise-grade security and processes documents in a secure cloud environment. It supports compliance requirements such as GDPR, HIPAA, and SOC 2 Type 2 audited controls.

What support is included with the Viewer API?

All plans include access to documentation and developer support. Additional support options may be available depending on your plan.

Kiran Kaza
Head of Mobile Engineering
“Our team can focus on implementing the features specific to the DocuSign business domain while leaving the handling of PDFs to the experts.”
DocuSign

Ready to try it?

Create an account to get your DWS Processor API key and start making API calls.