Recommended releases

Download Released

A CAPTCHA is a challenge-response test most often placed within web forms to determine whether the user is human. The purpose of CAPTCHA is to block form submissions by spambots, which are automated scripts that post spam content everywhere they can. The CAPTCHA module provides this feature to virtually any user facing web form on a Backdrop site.


  • Install this module using the official Backdrop CMS instructions at

  • Go to Configuration > People > CAPTCHA

  • You can either use the default Math CAPTCHA or also enable the included Image CAPTCHA module.

  • This module allows for additional modules to extend its functionality, such as reCAPTCHA.


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

Current Maintainers

This module is currently seeking maintainers. In the meanwhile it will be maintained by Herb v/d Dool.


Ported to Backdrop by Herb v/d Dool (

This module was originally written for Drupal ( Drupal maintainers are: wundo, soxofaan, elachlan, podarok, RobLoach.