QRBlock
The QRBlock mod emerged from experiments with Minecraft's rendering system and allows you to place blocks in your game world that display QR codes!
Simply place a QR code block and right-click on it. A special window will appear where you can enter any text - a web link, an encrypted message, coordinates, or something else! After entering the text and closing the window, the block will automatically generate a QR code on all its faces based on the entered data.
Now you can easily share information directly in your Minecraft world using modern QR code technology!