The Game Boy Printer, known in Japan as the Pocket Printer (ポ ケットプリンタ Poketto Purinta?), is a thermal printer accessory released by Nintendo in 1998, which ceased manufacture in early 2003. The Game Boy Printer is compatible with all the Game Boy systems except the Game Boy Micro, and is designed to be used in conjunction with the Game Boy Camera. It also prints images from compatible late-generation Game Boy and Game Boy Color games (listed below). It runs on six AA batteries and uses a special 3.8 cm wide thermal paper with adhesive backing, sold in white, red, yellow and blue colors. In Japan, a bright yellow Pokémon version of the Game Boy Printer was released, featuring a feed button in the style of a Poké Ball.
Mad Catz sells a kit that enables users to connect a Game Boy to a PC and print images using the PC's printer. Hobbyists outside the UK can also make their own cable for uploading images to their computer. A Game Boy Printer emulator is needed for the Game Boy to interface with the PC once linked via cable. The Game Boy Printer Paper has also been discontinued, and rolls of the genuine article that still produce a reliable image are becoming more difficult to find. Regular thermal paper, such as the kind used for POS terminals, can be cut to the proper width and used successfully with the Game Boy Printer.
The system will print a test message reading "Hello" if it is turned on while the feed button is held. According to the manual, this is used to test if the printer is functioning properly. To get around using six AA batteries (1.5 volts each) for the printer, a single 9V battery can be used if wired properly, because the printer requires 9V DC.