QR error correction (L/M/Q/H) explained and how to choose

2025-03-02

2025-03-02

Higher correction tolerates dirt or occlusion but packs modules tighter. Typical levels range from L (~7%) up to H (~30%).

Phone and digital UI
Figure 1: Center logos usually need higher correction and a smaller logo footprint.

How to pick

  • Outdoor posters or folded flyers: lean toward Q or H.
  • Clean digital-only use: L or M keeps the pattern sparser.
Mobile screen
Figure 2: Test at real scanning distance—don’t trust monitor preview alone.
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