About reCAPTCHA for Signup Forms

We do our best to include tools in Mailchimp that will help protect you from scammers and spambots. Google reCAPTCHA is a challenge-response test intended to prevent spambots from adding fraudulent emails to your audience.

In this article, you'll learn about different types of reCAPTCHA and how they're used in Mailchimp.

About reCAPTCHA

Google reCAPTCHA is a system designed to tell humans and computers apart, so bots can't fill out forms maliciously on behalf of a human. The CAPTCHA acronym stands for Completely Automated Public Turing test to Tell Computers and Humans Apart.

In Mailchimp, reCAPTCHA helps prevent bots from adding fake or malicious email addresses to your audience. There are two types of reCAPTCHAS: checkbox and invisible.

• Checkbox
  This type of reCAPTCHA requires new subscribers to check an "I'm not a robot" box. If you've enabled double opt-in and use an embedded or pop-up form, this will appear after your subscriber clicks the link in the opt-in confirmation email.
  
• Invisible
  This type of reCAPTCHA does some additional analysis behind the scenes. It doesn't require new subscribers to check a box, and will only present a visible reCAPTCHA if it detects it may be dealing with a bot.

The type of form you're working with determines which reCAPTCHA you'll use.

ReCAPTCHA is only required for Mailchimp-hosted signup forms, but we recommend you enable it to protect your audience if you use embedded or pop-up forms, or landing page signup form blocks.

Enable reCAPTCHA

To enable reCAPTCHA for your audience's embedded, pop-up, and landing page signup forms, follow these steps.

1. Click Audience, then click All contacts.
2. If you have more than 1 audience, click the Audience drop-down and choose the one you want to work with.
3. Click Settings.
4. In the Form settings section, toggle the slider to turn on reCAPTCHA for single opt-in forms.

All set! Now your audience's embedded and pop-up signup forms will display a checkbox reCAPTCHA, and your landing page signup forms will include an invisible reCAPTCHA.