Captcha Code Authentication

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Adds Captcha Code anti-spam methods to WordPress forms. This  captcha can be included in the following forms.

  • Comments form
  • Registration form
  • Lost password form
  • Login form.


  1. Download the plugin.
  2. Upload to your blog (/wp-content/plugins/).
  3. Activate it.
  4. Click the ‘Captcha’ menu.
  5. Fill in the options.

Important Note: It is mandatory to save options in this plugin.

You have the options to set following

  • Select the captcha should be either numbers or alphabets or both.
  • Select which are the forms need captcha code.

If you have any queries, please put it in the comments, I will reply you as soon as possible.

To download


If you are interested in translating this plugin, please send the translation to

I have been developing web sites since 2004 and currently working in London as a Senior Web Developer with responsibility for PHP/MySQL backend systems and jQuery frontend development. My ulitmate focus is on server side programming, release process, automation, and standards based web site design especially on Zend Framework. I also have a keen interest in developing Wordpress plugins and contributing to open source projects.

25 thoughts on “Captcha Code Authentication

  1. sushmitha

    i used “captcha code authentication” plugin it is working fine with comments form.
    i’m using “User submitted posts” plugin, for this form i need to add captcha how can i do that by using “captcha code authentication” plugin?


  2. Mike

    Dear Mr Cardoza,

    I’d like to use your wonderful CAPTCHA plugin as the basis to build on, in order to create a different kind of Captcha.

    Would this be okay with you? (I would, of course, credit you fully for the original code, along with links to your site and plugins.)

    Please let me know if this is okay with you.

    Mike Rogers

  3. Mike

    Dear Mr Cardoza,

    We’re 99% ready to release our plugin, but we’re seeing one issue we can’t seem to solve. The captcha we’ve created works perfectly on all pages except for “show on comments page” setting.

    On that page the captcha appears somewhat distorted and loses most of its styling. We think this due to the following two lines:

    add_action( ‘comment_form’, ‘include_captcha_comment_form’ );
    add_filter( ‘preprocess_comment’, ‘include_captcha_comment_post’ );

    ..or possibly this line a little further down:

    remove_action( ‘comment_form’, ‘include_captcha_comment_form’ );

    We’re not terribly familiar with the WP functions, can you tell us what these lines do and any suggestions on how to work around them?

    If you like, I can send you a link to the working system so you can see what it’s like. I’d prefer to do that offline or non-publicly if possible. Is there a more private way to send you the URL (email, perhaps)?

    Thank you!


  4. Mike

    Thanks for your assistance. I’m not sure I’ll ever figure out what the fix is, but you helped me rule out some things, and I’ll see if anyone on the wordpress developer forums can help resolve the issue I’m having.

    Thanks again!

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