CAPTCHANIM GateKeepers can be simply embedded in your site:
PHP sites can use our PHP Library. You can see live example here: Example site
Sites using other languages can use our API, see details in the CAPTCHANIM Web API guide.
For customizing your GateKeeper, select and set any of the options below under 'Text Control', 'Image Size', and 'Colors' (and optionally 'Advanced control'), or use the default initial values to affect the created GateKeeper. Follow the hints in the different tool-tips ( ) for the meaning of the parameters and/or their valid ranges. Then, to test your creation, press 'Test' in the 'Preview' window. The result will be presented in a few seconds in the 'Preview' window. Finally click the 'Get API Parameters' button and use the parameters in your site as explained in CAPTCHANIM Web API guide.