Custom reCaptcha is a plugin that gives you control over the look of the Google's reCaptcha widget. It can replace the standard reCaptcha plugin packaged with Joomla!
reCaptcha from Google is a 'one-size-fits-all-designs' widget that does not offer many possible styles. Until now it fit my projects but once I started working on responsive templates, the size of the default reCaptcha themes started being in the way, especially for mobile designs.
Nothing is lost, as Google offers a way to get the widget in a 'raw' state and is (almost) fully skinnable (see https://developers.google.com/recaptcha/old/docs/customization). The purpose of this simple plugin is to give you access to the raw widget and allow you to perform your own skinning, right from your template. Hard core stylers and developers alike, go crazy and make it beautiful. Do not hesitate to show off your designs in the forum.
The plugin uses version 1.0 of the reCaptcha Google API. That API is no longer supported, although will continue to work.
For more information, check Google's FAQ about reCaptchas v1 and v2 at https://developers.google.com/recaptcha/docs/faq.
News keys registered at Google will only work for v2 of the reCaptcha API.