captchas.netFree CAPTCHA-Service Why http://captchas.net? This server provides CAPTCHA images and audio files you can use in html-forms. CAPTCHA images can prevent forms to be used by robots. How does it work? A CAPTCHA image shows a random string which the user has to type to submit a form. This is a simple problem for (seeing) humans, but a very hard problem for computers which have to use character recogni
