Nazmul Hossain Nihal

This allows user to add a widget that generates QrCode for every page dynamically. Whenever a visitor visits the site the widget will show qrcode for current page that the visitor is visiting. User can add the widget with and without title, define the size of the qrcode, fill color and background color. If the user finds that widget is not working because of any problem with theme user can add custom HTML tag before and after the widget. Multiple widgets can be added same time.
Using this you can add favicons to :
<ul>
<li>Add QrCodes</li>
<li>Customize QrCodes</li>
</ul>

WpQrCode

Just another WordPress plugin for adding QrCode.

sippsolutions

If you host your site in a poor environment, WordPress may fail uploading large images as the process of creating the different sizes and thumbnails takes a large amount of CPU usage.
With this Plugin the images are simply resized to a maximum dimension (of for example 1600 x 1600 pixels) right in your browser before uploading them. 
The nice side effect is that unnecessary big images are resized to a fine size to still provide a usable, qualitative image.
Logo credits: Picture graphic by Flaticon from Freepik.

Canvas Image Resize

Re-sizes images right inside the browser BEFORE uploading them.

WpQrCode vs Canvas Image Resize