aklamator

It also enables you to place dynamic QR codes using widget. Dynamic QR codes are easier to scan and enable you to track number of scans, device type, and change URL destination.
How to auto generate QR codes for each post/page
Open plugin settings and choose static QR code (for simple QR codes without analytics). Each page/post will have unique QR code redirecting user which scans it to that page. 
If you create free CodeQRCode account and paste ApplicationID, dropdown list will show your dynamic QR codes also.
Checkout how to create QR code contact vcard and place it :
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/EqfTHkPVPoY?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
How to place AdSense ad code ? 
Just copy & paste AdSense or any other third party Ad code to box and optionally add name. Choose default Ad for each post and page. Go to Dashboard > Appearance > Widgets and Drag n Drop desired code to desired position. Thats it!
Advantages of Dynamic QR codes:
<ol>
<li>Easier to scan (because codeqrcode uses short URL)</li>
<li>Ability to change URL later (after placing it on your web site or printing it) – by using codeqrcode dashboard you can change destination URL whenever you want.</li>
<li>Scan analytics – using codeqrcode dashboard you can have insight in number of scans, device types used to scan, whether the scan is new or returning, date, time and much more…</li>
</ol>
You can read more about <a href="https://www.codeqrcode.com/blog/dynamic-vs-static-qr-code/" rel="nofollow ugc">dynamic vs static QR codes</a>

QRCode Generator – Adsense

CodeQRCode plugin enables you to automatically generate QR codes on each post and page on your wordpress site. Bonus: You can easily include your AdSe …

dweius

QutenizeR plugin for wordpress allows you to easily create personalized and colorful QR codes on the fly. <a href="http://qutenizer.com" title="qutenizer.com" rel="nofollow ugc">QutenizeR.com</a> is a free online Web service (beta) that generates full-color personalized QR codes on the fly. QutenizeR plugin for WordPress connects to it and get the images without leaving your blog’s admin pages. Feedback will be welcome. 
Enjoy this plugin!
This plugin uses Jan Odvárko’s JSColor available at http://jscolor.com

QutenizeR

QutenizeR plugin for WordPress is a funny way to easily create cute & colorful QR codes.

QRCode Generator – Adsense vs QutenizeR