A CAPTCHA™ is a popular tool for protecting HTML forms from spammers. They work by displaying some type of question that would impossible for a computer to solve, but a person wouldn't find difficult. The most common type of CAPTCHA is an image with text that has been warped or distorted in some way so that computers cannot read them, but humans can. The Securimage CAPTCHA is a free PHP CAPTCHA script that you can add onto your forms to protect them. It even supports adding audible codes for the visually impaired.

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Web Design Software Pick of the Week: Securimage CAPTCHA originally appeared on About.com Web Design / HTML on Sunday, August 8th, 2010 at 14:30:35.

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