What is the Dropbox Sign SMS tools add-on?

Updated Sep 18, 2025

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This article describes a paid feature available to Standard API and Premium Dropbox Sign API plans.

The Dropbox Sign SMS tools add-on has two features: SMS delivery and SMS authentication. SMS delivery gives you the option to send agreements out for signature via email and SMS. When using SMS delivery to send documents for signature, customers are responsible for obtaining a signer’s consent to receive text messages from Dropbox Sign. Prior to enabling this feature for their signature requests, customers must certify they have obtained such consent from all signers. SMS authentication lets you add enhanced signer authentication through SMS. Learn more about SMS authentication.

 

Standard API and Premium API customers can send an SMS verification code to their signers by enabling this feature in the admin console. How to manage signer authentication settings for your team. The SMS tools add-on can be purchased by contacting our sales team.

 

With the SMS tools add-on you can:

  • Send signature requests to and from any Dropbox Sign supported country
  • Pay in your local currency 
  • Get international support for SMS tools 
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Notes: 

  • Dropbox Sign supports the add-on for both invoice and credit card customers 
  • The SMS tools add-on can be sold in the following local currencies: USD, CAD, EUR, GBP, JPY, and AUD

Annual Allotment of SMS Signature Requests

USD

200

$60

300

$90

400

$120

500

$150

600

$180

700

$210

800

$240

900

$270

1,000*

$300

*List prices for volume tiers above 1,000 will continue to apply the same flat rate for that currency. SMS tools add-on will be sold in increments of 100 SMS signature requests up to 1,200, and then increments of 1,000's up to 360K (e.g. 2k, 3k, etc.).
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