Originally Posted by ManBearPig_06
You can take a normal picture and upload it to websites, or you can recreate it in programs like ms paint.
It has also been stated by the dev. that every qr code has a harder alternate puzzle to unlock the same anti-cube, so you don't actually need a qr reader at all.
Yeah, the alternate solutions are in the throne rooms in the game, though you'll have a hard time seeing them your first time through the game.