QR Code Error Correction Levels: L, M, Q, H Explained
QR codes have 4 error correction levels (L, M, Q, H) that trade capacity for damage tolerance. Learn which level to choose and how it affects code size.
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Tags: qr-code, encoding, developer-tools
QR Code Error Correction Levels: L, M, Q, H Explained Every QR code contains more data than the actual message it encodes. That extra data is error correction information — a mathematically computed checksum that lets the scanner recover the original message even when part of the code is damaged, dirty, or deliberately covered by a logo. There are four error correction levels. Choosing the right one affects whether your code scans reliably in a specific environment — and whether you can safely overlay a logo. Here's what each level means, when to use it, and what you're trading off. --- The Four Levels at a Glance | Level | Recovery Capacity | Relative Code Size | Best For | |-------|------------------|-------------------|---------| | L (Low) | 7% | Smallest | Clean digital displays,…
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