Quick QR Code!

Quick QR Code! is a WordPress plugin that automatically creates QR Codes for every single page of your website and allows you to download them with the click of a button. It’s made to be as simple as possible. All you have to do is activate the widget and a unique QR Code will be automatically generated for every page. No typing of URLs necessary! You may also use a Shortcode. You can then download the QR Code with the click of a button in sizes from 100 to 500 pixels.

See the User Guide and this server
note.

PHP version also available.