Esponce is a QR Code generator for WordPress plugin by esponce that generates a QR Code and inserts it into a blog post (shortcode) or sidebar widget. User can edit content, set module and background color, size, padding, version, etc. Plugin uses Esponce QR Code API 3.0 to generate a QR Code image. Image is then cached on the local WordPress server.
Shortcode:
user can edit content: message, hyperlink, e-mail, telephone number, etc.
parameters: module and background color, size, padding, version
displays popup dialog in editor
displays preview in visual mode
displays shortcode in HTML mode
Widget:
define title and content
change foreground and background color
change size, version, padding
supports multiple widget instances
The basic plugin is free and there are premium versions with added features on the plugin homepage at: http://www.esponce.com/plugins/wordpress
Download: http://wordpress.org/extend/plugins/esponce-qr-code-generator/