CodeTwo QR Code Desktop Reader & Generator is a simple program that can convert between QR code and text format. You can use this program to capture QR codes present in websites, documents, movie, image file etc. using your mouse cursor and decode them. The QR generator lets you create QR images at the required size.
If you want to include a QR code automatically in email signatures throughout a whole organization, you can try CodeTwo central email signature management solution.