1. There is no need to convert an image to GRF yourself. In the Link-OS SDK for .NET, there are APIs in the GraphicsUtil package to print an image file in PNG, JPG, etc., to a Zebra printer automatically. These APIs do the conversion behind the scenes.

2. The ^BQ command in ZPL instructs the printer to generate the QRCode image and print the image on the label. The QRCode size can be scaled up to 10 times with the magnification factor. We cannot generate a QRCode with an arbitrary size with the ^BQ command.

3. As described in #2, the ^BQ is the command in ZPL that instructs the printer to generate and print a QRCode.

Thank you for your reply.

I need to put a QRCode and text together on one label. The label size varies between DIN A4 (210 mm  x 297 mm) and DIN A5 (148 mm  x 210 mm), whereby about half of the label is to be printed with the QRCode and the other with text. In my case I think its easier for me to print directly with GRF converted image in my ZPL code.