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Uses the reCAPTCHA web service to improve the CAPTCHA system and protect email addresses.

reCAPTCHA helps power massive-scale online collaboration.


This port is currently just of the 2.x version which implements the new NoCAPTCHA reCAPTCHA.


reCAPTCHA depends on the CAPTCHA module.


  • Install this module using the official Backdrop CMS instructions at

  • Go to Configuration > People > CAPTCHA > reCAPTCHA

  • Enter the site key and private key that you receive after signing up for the reCAPTCHA service through Google.

  • Click "Save Configuration"

  • Go to Configuration > People > CAPTCHA (admin/config/people/captcha) to configure on which forms the ReCAPTCHA will appear and for whom.

Known Issues

  • cURL requests fail because of outdated root certificate. The reCAPTCHA module
    may not able to connect to Google servers and fails to verify the answer.

    See for more information.


This project is GPL v2 software. See the LICENSE.txt file in this directory for
complete text.

Current Maintainers

This module is currently maintained for Backdrop by Herb v/d Dool.


Ported to Backdrop by Herb v/d Dool (

This module was originally written for Drupal ( Drupal maintainers are: hass, diolan, liam-morland, id.medion, RobLoach.