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.

Text Captcha


It doesn’t take much to prove that computers are idiots, but most captchas go too far. Captchas based on graphics don’t work with blind people yet they dominate comment forums. This is a logical captcha that uses math and simple riddles to weed out the machines. This plugin comes with 10 predefined questions and the ability to add more. The math part isn’t too hard and can be disabled if you’re dealing with people who don’t like math. This plugin relies on php sessions to store information.


  1. Upload the text_captcha/ folder to your /wp-content/plugins/ directory.
  2. Make sure wordpress can write to captcha_config.json.
  3. Activate the plugin through the ‘Plugins’ menu in WordPress.
  4. Click Text CAPTCHA Plugin to configure the plugin (if you like) to toggle which captcha methods you wish to use and modify the questions.


Do I have to change my templates?

Maybe. It uses add_filter on the comments to automagically test the captcha but it requires that your comment submit button be have the default #submit id.

Does it rely on JavaScript? Sessions?

It uses WP’s included jQuery in the admin section and plain old javaScript to position the captcha. It uses sessions to hold the captcha answer.

What do you have left to do?
  • Add some css to make admin prettier.
  • Test on multiple versions of WordPress.
  • Gather feedback.
  • Bulletproof the PHP.
  • Bulletproof the JavaScript.
  • Bulletproof the Ajax.
  • Add config options for challenge header, error message.
  • Make the error message more graceful.
  • Consider storing captcha answers in the db instead of a session.


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Contributors & Developers

“Text Captcha” is open source software. The following people have contributed to this plugin.


Translate “Text Captcha” into your language.

Interested in development?

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



  • Initial import.
  • multiplication, addition and riddle modules.


  • Hack to make it work in explorer.


  • Added a rudimentary ajax hook so you can make it work with plugins like


  • Added ids to some of the form elements for easier styling