For a verbose code, you need the capacity of a 2D bar code, also called a matrix code or QR code (for quick response). The codes are generally about 645.16mmsq (1-inch-square) in size, but can ...

The codes are designed to hold a relatively large amount of data in a small space — just under three kilobytes of binary data, or more than 4,000 letters and numbers.

QR codes consist of black squares arranged in a grid (matrix) on a white background and are read by specialized software that can extract data from the patterns in the matrix.