QR code minimum size: how big to print for the distance it's scanned from

Most dead printed QR codes aren't broken — they're just too small for where they hang. The good news: sizing is arithmetic, not art. One rule covers everything from a business card to a billboard, with two corrections for data density and print quality.

The 10:1 rule

A QR code scans comfortably at up to roughly 10 times its own width. Flip it around: code width ≥ scan distance ÷ 10. A phone camera needs the code to fill enough of the frame to resolve individual modules, and at 10:1 that's reliably the case for a typical 25-module code on modern phones.

Size chart by placement

• Business card / product label — scanned in hand, 15–25 cm → 1.5–2.5 cm (0.6–1 in)
• Flyer, menu, table tent — 25–50 cm → 2.5–5 cm (1–2 in)
• Counter card, shelf talker — 50 cm → 5 cm (2 in)
• Poster in a hallway / shop window — 1–2 m → 10–20 cm (4–8 in)
• Window poster from the sidewalk — 2–3 m → 20–30 cm (8–12 in)
• Trade-show banner — 3–5 m → 30–50 cm (12–20 in)
• Billboard / vehicle wrap — 10 m+ → 1 m+ (40 in+) — and ask whether anyone can safely scan it at all

Treat these as minimums. Paper is cheap; a reprint after the run is not.

Correction 1: data density

The 10:1 rule assumes a low-density code (a short URL, version 2–3, 25–29 modules). More data means more, smaller modules at the same print size — and it's module size, not code size, that the camera must resolve:

• Short URL (~30 chars, v2–3): the chart above applies as-is.
• Long URL with UTM parameters (v5–6, 37–41 modules): add ~50% to the printed size — or better, shorten the URL.
• Full vCard (v8+, 49+ modules): double the chart values. This is why a vCard code on a business card should be 2 cm+ where a URL code gets away with 1.5 cm.
• WiFi credentials (v3–5): chart + ~25%, depending on password length.

Rule of thumb: keep each module at or above 0.5 mm in print for handheld scanning (a 25-module code + quiet zone at 0.5 mm/module ≈ 1.65 cm — matching the chart).

Correction 2: real-world print conditions

• Quiet zone: the 4-module white border is part of the minimum size. Cropping it is the #1 self-inflicted scan failure.
• Curved surfaces (bottles, cups): add 25–30%, and keep the code under ~25% of the circumference. More in the packaging guide.
• Behind glass / laminated: glare effectively reduces contrast — go one size up and use matte finishes (see retail windows).
• Textured stock (kraft, linen): raise error correction to Q/H and add ~25% size.
• Logo or artwork in the code: the art consumes error-correction budget, not resolution — size stays the same, but use level H. Why art codes still scan.

Can a QR code be too big?

Practically, no — phones scan large codes from close up without trouble. The real ceiling is convenience: a person standing 40 cm from a 1-meter code will have to step back. Size for the farthest realisticscanner, not the largest wall you have.

Test before the print run

1. Generate the code in the free generator and export vector SVG/PDF at final size — scaling a small PNG up blurs module edges.
2. Print one proof at actual size on the actual material.
3. Scan from the real distance, with an older phone if you can find one, in the dimmest realistic light.
4. If it hesitates: bigger, higher contrast, or shorter URL — in that order.

FAQ

What's the absolute minimum for any QR code? About 1 × 1 cm for a very short URL in perfect print — but below 1.5 cm you're relying on everyone having a recent phone. Don't design for the best case.

Does higher error correction change the size? Indirectly — levels Q/H add redundancy data, which can bump the code to a higher version (more modules). If size is critical, use M and protect the code from damage instead.

Inches or centimeters? The rule is unit-free: distance ÷ 10, in whatever unit you measure the distance.