General Settings | Spam Control - Zoho Forms


When you share a form publicly, there is a possibility of receiving spam entries in your form. To prevent spam entries, Zoho Forms provides an option to include a CAPTCHA in your form. CAPTCHA stands for Completely Automated Public Turing Test to Distinguish Between Computers and Humans . It's a common way to ensure that your form interacts with a human rather than a computer bot. Enabling captcha validation on your form can help you validate respondents by challenging them to enter a response before they submit a form and keeping the irrelevant data at bay. You can use the default CAPTCHA available in Zoho Forms or integrate with Google's reCAPTCHA services to protect your forms online.


You can select a CAPTCHA version from the following options:

Zoho Forms CAPTCHA   

This is a combination of alphanumeric characters used as a security check to ensure only human users can pass through.

  1. Go to Settings > Spam Control > CAPTCHA.

    CAPTCHA Configuration

  2. Under Select a CAPTCHA version, select Zoho Forms CAPTCHA.
  3. Enter a CAPTCHA Label.
  4. Enter a CAPTCHA Description and click Save

    Zoho Forms CAPTCHA

Google reCAPTCHA v2   

To prevent spam and bot entries in your form, you can integrate with Google's reCAPTCHA services. To set this up for your form, you will require a set of API key pair. You can choose from the following Google ReCAPTCHA options:

Note : You will require separate and unique API key pairs for both the above options.


To obtain a set of API key pair consisting of a Site Key and a Secret Key from Google,

  1. Login to your Google account.
  2. Register your site details.
  3. Enter a Label to identify the site.
  4. Choose reCAPTCHA v2 under ReCAPTCHA type.
  5. Under Domains, add the Zoho Forms domains and the custom domain you are using based on your DC as given in the below table.

    Domains to be included EU AU US IN
    Zoho Forms Domains
    Custom Domain (Example)

    Obtain Google  reCAPTCHA API keys

    Accept the reCAPTCHA Terms of Service and click Submit.

reCAPTCHA v2 ("I'm not a robot" checkbox)     

Including the reCAPTCHA v2 "I'm not a robot" checkbox will prompt the respondent to select a checkbox to validate that the respondent is not a robot.

To use this CAPTCHA version,
  1. Navigate to Settings Spam Control > CAPTCHA.
  2. Under Select a CAPTCHA version, select  Google reCAPTCHA v2 ("I'm not a robot" checkbox).
  3. Enter the API Key pair provided by Google after registering your website and domain.
  4. Select the required Language and Theme for your reCAPTCHA v2. The options supported by Google will be listed here.

reCAPTCHA v2 (Invisible reCAPTCHA badge)                   

Unlike reCAPTCHA v2 checkbox, the Invisible reCAPTCHA badge does not require the user to select a checkbox. Instead, it validates respondents in the background when they click Submit

To use this CAPTCHA version,

  1. Navigate to  Settings Spam Control > CAPTCHA.
  2. Under Select a CAPTCHA version , select Google reCAPTCHA v2 (Invisible reCAPTCHA badge).
  3. Enter the API Key pair provided by Google after registering your website and domain.
  4. Select the required Language and Theme for your reCAPTCHA v2. The options supported by Google will be listed here.

reCAPTCHA v2 (Invisible reCAPTCHA badge)

Refer to the FAQs on CAPTCHA.

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