My QR code doesn't scan. What should I check?
- Contrast: use a dark foreground on a light background. Inverted or pale colors fail on many phones.
- Size: print at least 2 × 2 cm (0.8 in); for posters, about one tenth of the scanning distance.
- Quiet zone: keep empty margin around the code.
- Logo: use error correction H and keep the logo under about 25% of the width.
- Content: long text makes dense codes. Use a URL or a dynamic code instead.
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