WordPress.org

Author: Peter Keung

Note: it is not recommended to use the WordPress automatic plugin upgrade on this plugin. Instead, download and extract the plugin manually from the plugin page at http://wordpress.org/extend/plugins/peters-custom-anti-spam-image

Stop a lot of spambots from polluting your site by making visitors identify a random word displayed as an image before commenting and optionally before registering. You can customize the pool of words to display. The comment form protection in this plugin is compatible with WordPress and WordPress MU. Default registration form protection is only compatible with normal WordPress. For WordPress MU, see here: http://www.theblog.ca/anti-spam-mu

Features

• Toggle whether registered users need to enter the word

• Random font display

• No cookies required

• No JavaScript required

• Auto-generated audio for visually impaired users

• Easy-to-read

• No mapping of words from the code -- words are used once or removed after 24 hours

• Reminder of what was entered if you get the word wrong

• Selective blocking of trackbacks, pingbacks

• Easy to translate

• Compatible with caching plugins

Negatives

• Purposely no obscuring techniques so that the anti-spam word is easy to read

• The more people who use this plugin, the more motivation for spambots to target it

Requirements

• GD Library and FreeType Library (There's a diagnostic page to tell you whether you have them installed. If needed, just ask your web host to install them!)

• WordPress 2.0 or higher (although that was released almost two years ago). WordPress 2.1 or higher to use the registration form protection.