Can a QR Code Stop Working? Top 5 Common Failure Causes

While static QR codes never expire mathematically, physical and design errors can prevent smartphone cameras from decoding them.

1. Broken Destination Links

If your website changes URLs, domain names, or returns a 404 error, the QR code still scans but the browser fails to load the webpage.

2. Insufficient Color Contrast

Scanners require at least a 70% contrast ratio between foreground modules and the background. Dark codes on dark backgrounds or light yellow on white will fail to scan.

3. Missing Quiet Zone (Margin)

ISO/IEC 18004 standards mandate a blank border of at least 4 modules around the entire QR code. If text or graphics touch the edge, the scanner cannot detect the boundary finders.

4. Oversized Center Logos

Placing a logo that covers more than 20% of the code area can exceed Reed-Solomon error correction capacity, corrupting essential data modules.