QR Code Size Guide: Minimum Size for Printing
Too small and it will not scan. Too large and it wastes space. Here is exactly how big your QR code needs to be.
Minimum QR code size
The minimum recommended QR code size is 2 cm x 2 cm (0.8 x 0.8 inches) for close-range scanning (within 25 cm / 10 inches). At this size, the individual modules are large enough for smartphone cameras to resolve. Going smaller than this significantly reduces scan reliability, especially in poor lighting.
The 10:1 distance rule
A widely used rule of thumb: the QR code width should be at least 1/10th of the expected scanning distance. If a poster will be scanned from 2 meters away, the QR code should be at least 20 cm wide. For a table tent scanned at 30 cm, the code should be at least 3 cm.
Tips
- This is a minimum — going larger improves scan reliability
- Account for the worst-case scanning angle, not just straight-on distance
Size by use case
Business cards: 2-2.5 cm. Table tents and flyers: 3-4 cm. Product packaging: 2.5-4 cm depending on product size. Posters (A3/A2): 8-15 cm. Banners and billboards: 30+ cm. Window stickers: 5-10 cm depending on expected distance. Always test in the actual environment.
Print resolution and DPI
For sharp QR codes, export at a minimum of 300 DPI for print. Higher DPI produces crisper module edges. Vector formats (SVG, PDF) are resolution-independent and ideal for print — they scale to any size without losing quality. PNG works well for digital use or when printed at a fixed size.
Tips
- SVG and PDF are best for print materials — they never pixelate
- For PNG, multiply your desired print size in inches by 300 to get the pixel dimensions needed
Factors that affect scannability at size
Data density matters — a code with a long URL has more modules packed in, requiring a larger print size. Error correction level also adds modules. Codes with logos need higher error correction and therefore more modules. Simpler content (short URLs, dynamic codes) creates simpler patterns that scan well at smaller sizes.
Frequently Asked Questions
What is the smallest a QR code can be?
The practical minimum is about 1.5 cm x 1.5 cm with simple content. Below that, most phone cameras cannot reliably resolve the modules.
What size should a QR code be on a business card?
Aim for 2-2.5 cm (about 0.8-1 inch). This works well for close-range scanning while leaving room for other card content.
Does adding a logo require a larger QR code?
Indirectly, yes. Logos require higher error correction, which adds more modules, which benefit from a slightly larger print size for reliable scanning.
What DPI should I use for printing QR codes?
Minimum 300 DPI. For best results, use vector formats (SVG or PDF) which are resolution-independent.
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