Quick rules
- Business cards: 15–20 mm square; error correction “H”.
- Flyers/handouts: 25–35 mm; place away from folds/edges.
- Posters: At least 1/10 of expected viewing distance (2 m → ~20 cm).
DPI basics
For crisp edges, print at 300 DPI. If exporting PNG, match pixel size to your physical size (1 inch at 300 DPI ≈ 300×300 px). SVG avoids DPI math and stays sharp at any size.
Contrast & placement
- Dark code on a light background.
- Keep a quiet zone (≥4 modules) around the code.
- Avoid glare: matte stock often scans better than glossy.
Create your file now in the generator.