What is Securimage?

Securimage is an open-source free PHP CAPTCHA script for generating complex images and CAPTCHA codes to protect forms from spam and abuse. It can be easily added into existing forms on your website to provide protection from spam bots. It can run on most any webserver as long as you have PHP installed, and GD support within PHP. Securimage does everything from generating the CAPTCHA images to validating the typed code. Audible codes can be streamed to the browser with Flash for the vision impaired.


  • Show an image in just 3 lines of code
  • Validate submitted entries in less than 6 lines of code
  • Customizable code length, character sets, and Unicode support
  • TTF font support
  • Easily add background images
  • Several security features such as image distortion, random lines, and noise
  • Flash button to stream audible codes in WAV format
  • Ability to use a word list
  • Case sensitive option for added security
  • Display alphanumeric captchas, mathematical captchas, or a multi word captcha
  • Highly customizable!

Posts and Updates

Docs Updated

Comments Off on Docs Updated Written on April 3rd, 2011 by
Categories: Posts

The documentation page explaining how to customize Securimage has been updated. It explains in depth how to change colors, adjust the difficulty, use a custom font, and more.

Also, a Securimage WordPress plugin for automatically protecting your comment forms is being tested. If you would like to try it, please post a reply or contact me to try it before it is released.

Site Updated

Comments Off on Site Updated Written on February 27th, 2011 by
Categories: Posts

After some downtime, Securimage is back up and running. Sorry for the problems but the database and most site contents are gone. More content will be coming up shortly and a new version re-written for PHP5 with new features is being tested and will be posted soon.

Thanks for your understanding!