page_title: QR code
section_title: Website login
hierarchical_section_title: QR code / Uses / Website login
caption_attribution_description: English: A QR code to automatically connect to the SSID Wikipedia with the password Password1! The data embedded in the QR code is WIFI:S:Wikipedia;T:WPA;P:Password1!;; In this image you can see an iPhone scanning this QR code.
context_page_description: A QR code is a type of matrix barcode first designed in 1994 for the automotive industry in Japan. A barcode is a machine-readable optical label that contains information about the item to which it is attached. In practice, QR codes often contain data for a locator, identifier, or tracker that points to a website or application. A QR code uses four standardized encoding modes to store data efficiently; extensions may also be used.
  The Quick Response system became popular outside the automotive industry due to its fast readability and greater storage capacity compared to standard UPC barcodes. Applications include product tracking, item identification, time tracking, document management, and general marketing.
  A QR code consists of black squares arranged in a square grid on a white background, which can be read by an imaging device such as a camera, and processed using Reed–Solomon error correction until the image can be appropriately interpreted. The required data is then extracted from patterns that are present in both horizontal and vertical components of the image.
context_section_description: QR codes can be used to log into websites: a QR code is shown on the login page on a computer screen, and when a registered user scans it with a verified smartphone, they will automatically be logged in. Authentication is performed by the smartphone which contacts the server. Google tested such a login method in January 2012.
caption: A QR code to automatically join a Wi‑Fi network
exif: {}