A collection of free CAPTCHA scripts and services than you can easily integrate into your website using PHP or JavaScript. Create contact forms in HTML that work. A contact form is a must if you want to hear from visitors. Facebook pages and email newsletters are two key places to use contact forms.Here, we show you how to generate code for an HTML contact form, including a PHP script that will send form responses to you.

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2007-10-24: Captchas are a great way to slow spammers down. Spammers and other annoying jerks have discovered ways to abuse websites that offer contact forms, guestbooks, feedback pages, and so on. When spammers use automated tools to attack these pages, they can post many unwanted messages very quickly. To slow down these attacks, many websites use CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) software. 'Turing tests' in general are used to distinguish between computers and real people. In particular, captcha software (the term is commonly used as an ordinary noun, uncapitalized) tries to provide a test that humans can easily pass, but computers will hopefully fail.

A typical captcha involves a picture of text— usually with the text rotated, distorted, colored and otherwise creatively altered. Human beings have no trouble reading the text, but simple computer programs can't. A well-written captcha can often keep out even OCR (Optical Character Recognition) programs. What the heck is a Turing Test? A 'Turing test' is any test that attempts to distinguish human beings from computers. The idea of a Turing test is credited to the computer science pioneer Alan Turning, who first described it in 1950. For more information, see.

Captchas Are Not Perfect. Not Even Close Sounds like a good idea— so what's the catch?

Well, there are several problems: 1. Computers can break 'em anyway. Although amateur programmers won't have an easy time doing so. Greg Mori and Jitendra Mailk's discusses advanced techniques that can be used to crack even fairly sophisticated captcha systems. Some humans can't break 'em!

Obviously, blind users can't solve a visual captcha. Better captcha systems also offer an audio-based option. Even then, (those who are both deaf and blind) are locked out. Sites employing captchas should at least consider offering special accounts to those with special needs in this area. One solution is to offer a telephone number— and make sure you accept TDD relay calls! These are voice calls placed through an interpreter.

Your telephone support staff should be educated about this and encouraged to create accounts or carry out other captcha-protected tasks on behalf of legitimate users who contact you via phone. Captchas can take up extensive CPU resources (that is, slow down your web server) or require features not present on your website (for example, some web hosts doesn't include the in their PHP offering— probably because they don't realize how easy it is). Bad guys will, in some cases, hire humans to do the data entry instead, or at least to do the captcha-solving part.