RobertoAlicata

Usage:
write [qrcode] to generate a QRcode for the actual url with size of 100×100 pixels
you can specify these attributes:
size (it indicates the size in pixels for width and height, default: 100)
alt (it indicates the alternative text for the image: default “scan QR code”)
content (leave it blank to pass the actual url or write the content to encode)
click (write “yes” to make the image clickable)
fgcolor (foreground color in hexadecimal format)
bgcolor (background color in hexadecimal format)
example: [qrcode size=200 content=”www.robertoalicata.it” alt=”scan me NOW” click=”yes”]

ra_qrcode

a simple WordPress plugin to generate a QR code with a configurable shortcode and Widget

bijon

Use this qr code wordpress plugin to create a qr code on any site of your WordPress installation. Content can be any text or the current URL of the site where it is embeded.
How to use it:
<ul>
<li>
Use the shortcode [qr-code] within your site to generate a qr code including the URL of the current site
<ul>
<li>It`s not neccessary to give any parameters!</li>
</ul>
</li>
</ul>
<h3>Author</h3>
Bijon Krishna Bairagi
“I create useful free microsites!” 
(https://bijonkrishnabairagi.blogspot.com/” Free qr code online generator”)

QR Code Generator

QR Code Wordpress plugin to insert a QR code in your blog. The qr code contains the current URL or any other text you like.

ra_qrcode vs QR Code Generator