Expiration

Static QR codes have no expiration - data is embedded in the code itself and remains readable indefinitely. Dynamic QR codes depend on server availability; platform discontinuation invalidates all printed codes.

Intentional expiration applies to coupon QR codes (displaying "expired" after deadline), event tickets (invalidated post-event), and TOTP setup codes (single-use). For printed materials, ensure QR code destinations outlast distribution periods, or redirect expired links to alternative pages to protect brand trust.