QR quality settings
Here you can set the size (in pixels) of how big you wan the QR code to be when you download it. You can read more about the Minimal size here, so your customers are always able to scan the QR code when you’ve printed it.
This means it will create a nice border around your QR code with your QR code in the center, if you edit the background color you can create a cool border around your custom QR code.
The error correction capability settings come in handy when you’re customising your QR code and still want to be able to scan the QR code. If your QR code stopped working after customisation you can increase the settings and test again, keep increasing until you found the right settings for your custom QR code.