Updated: 08/22/2007 - CAPTCHA service is a service that allows you to add verification image (CAPTCHA) to your web site and protect your forms against spam robots. Compatible with PHP, Perl, ASP and ASP.NET You can customize the captcha size, color, font, background and more. Besides images, our service can also generate sound files for people with impaired vision. You can click the reload button to renew the captcha in case it is not readable.