QR codes
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How Small Can a QR Code be Printed and Still Work?
The best QR code print size, excluding the quiet zone, is 2 cm by 2 cm (0.8 inches by 0.8 inches).
However, a QR code can still be scannable even if it is smaller than the ideal size, provided that the scanning distance (QR code distance from the scanning device) is less than 5 centimetres (1.97 inches). QRs printed on business cards, visiting cards, tickets, and other forms of paper media are great examples of small-sized QR codes.
What is The Ideal Size of a Digital QR Code?
Digital QR codes work best when sized at least 240 by 240 pixels (6.35 cm by 6.35 cm) with a minimum of 72 DPI (dots per inch) resolution.
How Much White Space do You Need Around QR Codes? / How Much Margin Should I Keep Around a QR Code? / What is an Ideal "Quite Zone"?
The size of a “quiet zone” depends on the size of your QR code. To achieve maximum scannability success, ensure the QR code is surrounded by a “quiet zone” of around 15% of the entire QR code dimension.
For example, if the QR code dimensions are 20 cm by 20 cm (7.87 inches by 7.87 inches), then the quiet zone should be at least 3 cm (1.18 inches) on all four sides.