Usability

Usability is a concept that refers to the effectiveness / efficiency / satisfaction with which specific users use a product or service for a specific purpose. It is defined in ISO 9241-11 and is the academic term for "ease of use."

The usability of a QR code is evaluated in three stages: before scanning / during scanning / after scanning. Before scanning, what matters is whether the QR code is in an easy-to-find position, whether the CTA makes clear what the user will get, and whether the size is sufficient (at least one tenth of the reading distance / 2 cm square if read up close). During scanning, what affects usability is whether the contrast is sufficient for the camera to recognize the code quickly and whether the error correction level is appropriate. After scanning, the loading speed of the landing page, mobile optimization, and how easy it is to find information are decisive.

Consideration for older people and users unfamiliar with digital technology is also an important aspect of QR code usability. An instruction such as "Please scan the QR code" alone is not enough; adding concrete steps such as "Point your smartphone camera at the QR code" raises the usage rate.

As a usability test, an effective method is to have real users scan the QR code and observe where they stumble. Feedback such as "I didn't notice the QR code," "I didn't know what I would get," or "The page was too heavy, so I left" becomes a concrete clue for improvement.