QR code accessibility refers to the design practices that make QR codes usable for people with visual impairments, color vision deficiency, motor disabilities, or age-related vision decline.
Because QR codes are inherently visual, ensuring accessibility requires deliberate effort. The most fundamental measure is placing a text URL alongside every QR code. Screen reader users cannot scan a QR code, but they can follow a text link. Using a shortened URL keeps the fallback text easy to type manually.
Color vision deficiency affects roughly 5% of Japanese males (about 3 million people). When adding color to a QR code, avoid red-green combinations and rely on lightness contrast instead. Meeting the WCAG 2.1 contrast ratio guideline of at least 4.5:1 is recommended.
Physical size is another accessibility factor. Older adults or users with limited dexterity may struggle to aim a phone camera precisely. A minimum size of 3 cm square, combined with an adequate quiet zone (the blank margin around the code), significantly improves scan success rates.
When embedding a QR code image on a web page, set the alt attribute to something like "QR code linking to [page name]" and place a conventional text link nearby. On printed materials, print the shortened URL in a large font next to the QR code so that users who cannot scan still have an access path. You can find related books on Amazon.