QR codes are designed to be resilient. Even if part of the code is damaged, obscured by a logo, or printed poorly, it can still scan. This resilience comes from error correction — a built-in feature that makes QR codes far more reliable than barcodes.
What Is Error Correction?
Error correction adds redundant data to the QR code. This extra data allows the scanner to reconstruct the original information even if parts of the code are unreadable. The more error correction you add, the more damage the code can withstand.
The Four Error Correction Levels
Level L (Low) - 7% Recovery
Can recover from up to 7% damage. Suitable for digital use where the code won't be physically damaged. Results in the smallest QR code size for a given amount of data.
Level M (Medium) - 15% Recovery
Can recover from up to 15% damage. The default for most QR code generators. Good balance between size and reliability.
Level Q (Quartile) - 25% Recovery
Can recover from up to 25% damage. Recommended for codes that will be printed on materials that might get scratched or dirty.
Level H (High) - 30% Recovery
Can recover from up to 30% damage. Essential when adding a logo to your QR code, as the logo covers part of the data area. Also ideal for outdoor use or rough handling.
Choosing the Right Level
For most use cases, Level M is sufficient. If you're adding a logo, use Level H. For outdoor signage or stickers that might get damaged, Level Q or H is recommended. GenQR AI lets you choose the error correction level that fits your specific needs.
Error Correction and Logo Placement
When you add a logo to your QR code, the logo covers part of the data area. Using a higher error correction level ensures the code remains scannable despite the logo. That's why GenQR AI recommends Level H when using logos.
Test Your Codes
Regardless of error correction level, always test your QR codes in the environment where they'll be used. A code that works on your screen might fail when printed on textured paper or displayed in bright sunlight.
Generate with Confidence
GenQR AI gives you full control over error correction levels. Create reliable, scannable QR codes for any use case — for free.