Spam form submissions is a common problem that web owners have to face. There is no exception to Magento 2 forms. In today's post, let's see how this issue is resolved in Blue Form Builder, a powerful Magento 2 form builder extension.
https://www.magezon.com/magento-2-form-builder.html

Blue Form Builder 2 types of Captcha to help you protect your forms from spam:
1. Google reCaptcha
To add Google reCaptcha to a form, please:
Step 1: Sign up for an API key pair including site key and secret key: https://www.google.com/recaptcha/admin/create#list
Step 2: Go to Stores > Settings > Configuration. In the left panel, span MAGEZON EXTENSIONS and click Blue Form Builder. Then open reCaptcha or reCapcha3 tab to enter Site key and Secret key.
Step 3: Open the edit page of the form you want to add Google reCaptcha. Then add reCaptcha element.
In the element settings, open the Advanced tab to customize: reCaptcha Type, reCaptcha Language, reCaptcha theme, reCaptcha Size and show/hide reCaptcha with logged in users.

2. Magento 2 Captcha
Enable Magento 2 Captcha is super easy. Just add Magento 2 Captcha element to the form.