About QR Codes

QR (Quick Response) codes are two-dimensional barcodes that can be scanned by smartphone cameras to quickly access URLs, contact information, or other data.

Error correction levels:

• L (Low): 7% of data can be restored if damaged
• M (Medium): 15% of data can be restored if damaged
• Q (Quartile): 25% of data can be restored if damaged
• H (High): 30% of data can be restored if damaged

Higher error correction levels make the QR code more resilient but also more complex (more dense).