PHP Captcha Script: Securimage

Securimage is an free PHP captcha script used for protecting web forms from spam and abuse.

It can be easily installed and very well documented.

Different than the famous reCAPTCHA, which is web-based, Securimage is a downloadable solution that requires PHP and GD library to work.

PHP Captcha Script

Some feature of this captcha solution:

  • 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

You can find a demo of the captcha here.

  1. Reply Ben Dover May 20, 2008 at 10:50 AM

    Stumbling your own site is pretty lame.

    Thumbs down here….

  2. Reply Will May 20, 2008 at 4:37 PM

    So is posting that something is lame, and linking to another site. 🙂

  3. Reply Thomas June 22, 2008 at 7:02 AM

    That is perfect!!!! Works fine, fast and easy to use, thanks a lot! I love this kind of code

  4. Reply nasir July 14, 2008 at 3:04 PM

    this is a vary good shareing

  5. Reply lorz November 14, 2008 at 5:31 AM

    I’ve used the captcha in one of my projects

  6. Reply tom February 27, 2011 at 1:31 AM

    hey I am trying to use this captcha, but when I use the onsubmit (on the form) it doesn’t work. when i do not use the onsubmit it does work. what can i do to make it work?

  7. Reply Phil May 26, 2011 at 6:39 AM

    The PHPCaptcha script has well known security vulnerabilities:

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