How big should QR codes be?

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Related questions

  1. What can QR code be used for?
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Tags

  1. #minimum
  2. #250mm
  3. #nominal
  4. #billboard
  5. #magazine
  6. #smartphones
  7. #effective
  8. #printed
  9. #distance
  10. #relationship
  11. #where
  12. #between
  13. #inches
  14. #passer
  15. #metres
  16. #approximately
  17. #would
  18. #about