Question 1

Which error correction level should I use?

Accepted Answer

For most printed materials in clean indoor environments, Level M (15%) offers a good balance of reliability and simplicity. Use Level Q or H if you plan to add a logo overlay, if the code will be exposed to moisture or dirt, or if it will be printed on textured surfaces. Use Level L only for pristine digital displays where no physical damage is possible.

Question 2

Can I add a logo to my QR code without breaking it?

Accepted Answer

Yes, but you must increase the error correction level. A logo typically covers 10–15% of the code area. Level Q (25%) or H (30%) provides enough redundancy to compensate. QR-Hero's generator automatically adjusts the error correction level when you add a logo overlay to ensure reliable scanning.

Question 3

Does higher error correction make the QR code bigger?

Accepted Answer

Yes. Higher error correction adds more redundant modules, which increases the total number of modules in the grid. This can push the code to a higher version (larger grid), resulting in a denser or physically larger code. The trade-off is worth it when scan reliability in harsh conditions is more important than code simplicity.

Question 4

What happens if my QR code is damaged beyond the error correction threshold?

Accepted Answer

The scanner will fail to decode the data, and the user will see an error or no response at all. This is why choosing the right level for your environment is important. If you anticipate significant wear, go with Level H (30%) to maximize the code's resilience.

QR Code Error Correction Levels (L, M, Q, H)