Tomek

How to use shortcode in your post or page?
[qrcode]
or
[qrcode url=”http://my-site.com” margin=”10″ size=”100″ before=”QR Code” after=”QR Code”]
CSS:
.qrcode { float: right; }

QR Code

It lets appear the QR-code of the given site in the slidebar

QRtool

QR-Code widget and shortcode in one QR-Code generator plugin. Use the QR-Code widget in your sidebars or generate QR-Codes in pages and articles by inserting [qr-code] right where you want your QR-Code to be displayed.
The QR Code widget is equipped with configurations for alignment, color (foreground and background), size, margin, error correction of QR-Code and more to suit the needs of your installment.
The shortcode [qr-code] can be extendet with attributes to achieve the same level of customization as with the widget. 
Example: 
[qr-code align=”left” class=”my-qr-code” color=”#000000″ background_color=”#FFFFFF” size=”4″ margin=”4″ level=”M” post_id=”0″]

WPQR QR-Code Generator

QR-Code widget and shortcode in one QR-Code generator plugin. Use the QR-Code widget in your sidebars or generate QR-Codes in pages and articles.

QR Code vs WPQR QR-Code Generator