This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.



Protect your forms from spam with hard to break and easy to read Secure CAPTCHA images from

Secure CAPTCHA allows to distinguish between form submition made by human and script (robot, bot, program etc.).
It gives you ability to reject all form submitions made in automatic way.
Secure CAPTCHA was designed to be both hard to break with a script and easy to solve by the humans.

Most of available simple CAPTCHA libraries are easy to break.
They use one font and scale or rotate each letter individually.
There are scripts on the web that are capable to break them.
Some CAPTCHAs add random lines and patterns, but it make the text harder to read by a human.

Secure CAPTCHA is made with handwriting.
Letters are connected together and it is difficult for a script to split text into individual letters.
Moreover, each letter looks somewhat differently depending on it’s two neighbour letters.
And finally, the whole text is transformed with some randomly chosen nonlinear transformation.

Many CAPTCHA implementations on the web are really hard to read.
Sometimes it is even impossible.
Secure CAPTCHA is easy to solve for a human: our images have big letters and high contrast between the text and the background.


  • screenshot-1.png


  1. Download the latest version of the plugin and unzip it.
  2. Move the entire secure-captcha folder to the /wp-content/plugins/ directory.
  3. Activate the plugin through the ‘Plugins’ menu in WordPress.
  4. Create account on the Create a site entry and obtain SiteID and PrivateKey.
  5. Configure the plugin: paste your SiteID and PrivateKey. Choose which forms to protect.

Contributors & Developers

“Secure CAPTCHA” is open source software. The following people have contributed to this plugin.


Translate “Secure CAPTCHA” into your language.

Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.



  • Logout echo bug removed


  • Host name changed


  • First version.