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What is Captcha?

This utility provides captcha verification in the MODX Manager login.

It uses 5 system settings:

- captcha.enabled - If set, the captcha function is turned on
- captcha.use\_mathstring - If set, the image is a simple equation for the user to solve
- captcha.words - Selection of words used for the image if captcha.use\_mathstring is off
- captcha.height - Height of captcha image in pixels
- captcha.width - Width of captcha image in pixels

The Captcha components can also be used by other components to create captcha-style verification for front-end forms.

Install via Package Management, then modify the captcha System Settings as desired.

Package Information

  • Downloads: 17,329
  • License: GPLv2
  • Requires: Revolution 2.0.x or greater
  • Supports: mysql,sqlsrv


This version of the Captcha extra was developed by Bob Ray. It was first posted to GitHub on Jan 11, 2011. As of Jun 22, 2017 it had been last updated on Jun 22, 2017, had 53 commits, and had been downloaded 17,329 times. The Captcha package consists of 243 separate files, containing 21,416 lines of code.

It is currently maintained by Bob Ray.


Captcha can be downloaded and installed from within the MODX Revolution Manager via Package Manager (Extras -> Installer), or from the MODX Extras Repository.

Development and Bug Reporting

Captcha is stored and developed using GitHub, and can be found here: Captcha GitHub main page.

Bugs and feature requests can be filed here: Captcha issues page..

Questions about how to use Captcha should be posted on the MODX Forums.


The full documentation for Captcha can be found at the author's web site (Bob's Guides): Captcha Documentation.