Quick Response (QR) codes are free to produce, allow access to data, and can be read with most smartphones. QR codes are already popular in some other countries and are gaining popularity in the United States. This article discusses this growing popularity and the reasons for it, how QR codes are being used in law libraries and the legal profession, and how they may be used by librarians in the future to add value through the marketing of professional and library services and by providing easy access to information from library resources.