Captcha download is an inevitable step in the life of every webmaster or blogger who wish to limit the usage of submission forms (contact forms, comments, polls etc) for humans. Here are some examples of captcha codes you can download (free, free to try, or free to pay) and implement in your website or blog to prevent nonhuman abuse of your open submission forms.

Free Captcha Download

The official captcha website (captcha.net) offers, actually encourages, free captcha download for several web scripting languages (ASP, PHP, Java and more) and common user friendlier content management systems (Wordpress for example). You can download, implement and contribute your part in the reCaptcha book digitizing project.

That is if you want to download the classic captcha, i.e. a box with twisted black & white phrases. But if you want to amuse your readers with a captcha that is more a pleasure look at, you may want to look further. Securimage is a popular and reliable free captcha download provider (for PHP), as their product has been downloaded and implemented by variety of sites from Australia to Indonesia. They offer a text based captcha, but with wide variety of styles, backgrounds and colors.

Customized (& Non-Free) Captcha

A customable non-free captcha code download for PHP is the Captcha Creator where you can choose three types of text based captcha scripts: classic captcha, pastel captcha and the difficult fragmentation captcha, and customize the captcha size, characters, font, background and noise in each. Prices range from $36 to the standard edition to $49 to the developer edition.

CNET Download.com users recommend on Lanapsoft (formerly Lanap) captcha download for ASP or ASP.net. Priced at $59 (and up) with available free trial, their BotDetect package features 50 different Captcha algorithms, audio support, customable image size, format and characters, and backgrounds that would make your eyes ache…