Learn how QR code density and module size affect scan reliability. Understand QR code versions, minimum print sizes, and best practices for readable codes.
QR code density refers to how many modules (the individual black-and-white squares) are packed into the code grid. A higher-density code has more modules in the same physical space, making each module smaller. Module size is the actual printed dimension of a single square, and it directly determines how easy the code is to scan — smaller modules require closer scan distances and higher print resolution.