Securimage: PHP Captcha Security

A captcha is a type of challenge-response test used in computing to ensure that the response is not generated by a computer.  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 run on most any webserver as long as you have PHP installed, and GD support within PHP.



  • Show an image in just 3 lines of code
  • Validate submitted entries in less than 6 lines of code
  • Customizable code length
  • Choose the character set
  • TTF font support
  • Use custom GD fonts when TTF is not available
  • Easily add background images
  • Multi colored, angled, and transparent text options
  • Arched lines through text
  • Generates audible captcha files in wav format
  • Use a word list for creating captcha codes

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