A QR code itself doesn't expire. However, it’s possible that the information linked to the QR code has an expiration date. For example, if the QR code contains a website’s URL, that website's availability or content might change over time, making the QR code outdated. In addition to that, tickets or coupons encoded in QR codes might expire after some time. As a result, the QR code might be invalid. Similarly, if a QR code is associated with a mobile app or service, and that app or service has time-based access or a subscription, the QR code's usefulness may be limited after a certain period.  So, while the QR code itself doesn’t expire, the information linked to it may not stay valid forever.