Get a Free CAPTCHA For Your Site

The reCAPTCHA project at Carnegie Mellon University offers a free, secure and easy to install CAPTCHA implementation. reCAPTCHA also channels the human effort spent solving CAPTCHAs into helping to digitize books from the Internet Archive. When you solve a reCAPTCHA, you help preserve literature by deciphering a word that was not readable by computers. Learn more.

• PHP CAPTCHA Plugin

• MediaWiki CAPTCHA Plugin

• WordPress CAPTCHA Plugin

• ASP.NET CAPTCHA Control

• Other Plugins (Python, Perl, Java, ColdFusion, Drupal, etc.)

© 2000-2009 Carnegie Mellon University, all rights reserved.