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.

alvinmuthui

Tori Codes provides an easier way to add QR codes to your site and display them using shortcodes. Also, one can use a single QR code on multiple pages/posts by adding the QR shortcode to the desired pages or posts.

Tori Codes

Tori Codes adds QR barcodes to your site with ease. Provides UI to edit the QR content and display it on numerous pages using a shortcode.

WPQR QR-Code Generator vs Tori Codes