Add checkbox fields anywhere on a document for signing with C# SDK using the API

Place fillable checkbox fields anywhere on a document using the SignNow API. Change the size of checkbox fields, make them required or conditional, even add signer roles.
Want to embed e-signatures into your workflows?
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Add checkboxes with ease while preparing a document for sending.
Customize your fillable form by adding checkbox fields using a simple API call.
  • We provide developers with complete SDKs for all popular languages, allowing them to integrate e-signature workflows without writing a single line of code.
  • With our detailed documentation, integrating the SignNow API is a breeze.
  • The SignNow API not only provides you with e-signatures: use it to create fillable forms, request payments, and download & archive documents using simple API calls.
Watch the SignNow API in action:

Start using the SignNow API with any of our SDKs

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