What should the code hold?
Style
Dots colour
Background
Dot shape
Logo in the middle
QR keeps the logo small and adds extra repair data, so the code still reads.
Clear space around the code
Read a code
Point the camera at a code, or choose a photo or screenshot. QR reads it on this device and shows where it leads before anything opens.
Codes you made
Kept on this device only. Tap one to open it again.