The BoldSign mobile app is now available. Visitthis link for more details and give it a try!

The BoldSign mobile app is now available. Visitthis link for more details and give it a try!

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Explore the BoldSign features that make eSigning easier.

Fast and Scalable eSignature API for DotNet

A fully featured eSignature DotNet SDK to embed, collect, and send eSignature requests

No credit card required

Straightforward API

We designed our REST API to be concise and straightforward. Your developers achieve any action with a single API call and no need to make multiple API calls only to send a single signature request.

eSignature APIs are straightforward
Embedded send and sign process in your app

Embedded Send and Sign

You can embed a fully customizable document sending and/or signing process within your application with custom branding and an email workflow.

Dynamic Field Placement

Positioning signature or input fields through x- and y-coordinates in a dynamic document is a complex task even for seasoned developers. Using our text tag feature, developers can put invisible text in the place of fields, and the BoldSign API will automatically convert those to actual fields before sending.

Position fields dynamically using eSignature APIs
Label the documents for filtering


You can label each sent document with your tenant IDs or any unique ID to make it easy to fetch or list documents based on tenants or users.


Customize what your signers see with your brand logo, color, and legal terms. You can also add and manage multiple brands within a single account and select the appropriate brand before sending each document.

Customize appearance with brand logo, color, etc.
Track document status using webhooks


Save your computer resources by using BoldSign webhooks to listen for any changes in document statuses. Our webhooks are fault-tolerant and highly reliable. That is, even if your services are down in an unlikely event, we will retry the webhooks for 8 hours.

And more

Our eSignature solution is a complete offering. It has all the essential features needed for enterprises and small businesses:

Document workflow

Team document management



Signer authentications

Bulk links


Custom permission