QR codes are generated using QR code generators, such as Reachhub's free QR code generator. These generators encode the desired information into a pattern of black squares arranged on a white square grid or colours of your choice. You can them print them, or copy paste them for future use.

A QR code is a two-dimensional barcode that contains information readable by a QR scanner or smartphone camera.

No, QR codes can be customized in terms of colour right here on Reachhub. While traditionally they are black and white for optimal readability, they can incorporate various colours and even images, as long as the QR scanner can still interpret the underlying data pattern.

No, QR codes do not "run out" in the sense that there is a finite number of them. They are generated algorithmically and can be created as needed. However, there can be practical limitations on their usage due to factors like storage space or memory constraints in certain applications or devices.