How to print a QR code correctly

Updated 2026-07-05 · The Ever-QR team

A QR code that scans on your screen can still fail on a wall. Printing adds physics: distance, light, angles, laminate glare, paper texture. Here is what actually determines whether a printed code scans — with numbers we measured, not folklore.

The rule of ten for size

The working rule: printed width ≈ scanning distance ÷ 10. A code on a table menu, scanned from 20-25 cm, works from about 2-2.5 cm wide. A poster read from 2 metres needs around 20 cm. When in doubt, size up — nobody has ever complained that a QR code was too easy to scan.

Two factors tighten the rule: long URLs (more data → denser pattern → bigger modules needed, so keep destinations short) and low light or moving readers (drive-through, shop windows: add 50%).

What we measured

While validating Ever-QR's export pipeline, we decoded our own printed-resolution files at decreasing sizes. A code built with maximum error correction, a clean quiet zone and full contrast — including one carrying a centered logo — still decoded when downscaled to the equivalent of roughly 1.5 cm, far below the sizes we recommend. The reserve is the point: field conditions (glare, angle, wear) will eat margin, and you want that margin to exist. A code that barely scans in perfect conditions has already failed; it just doesn't know it yet.

The margin everyone forgets: the quiet zone

The QR standard requires a quiet zone — clear space, at least 4 modules wide, on all four sides. Scanners use it to locate the pattern's edges. Designers routinely crop it to fit layouts, place the code against a border, or print it on a busy photo background. It looks fine; it scans erratically. If your generator exports files without this margin, that alone disqualifies it for print work.

Contrast: dark on light, and actually dark

Scanners read the difference between modules and background. Dark pattern on light background, with strong contrast — navy on white works; pastel on cream is a gamble; inverted codes (light on dark) fail on many older readers. Our generator scores contrast live and warns below safe thresholds, because this is the second most common print failure after size.

Error correction: your damage insurance

QR codes carry redundancy: at level H, up to ~30% of the pattern can be damaged, dirty or covered and the code still reads. That reserve is decided at creation and cannot be added later. Choose maximum correction for anything printed — and consider it mandatory if a logo sits in the middle, since the logo is spending that reserve before the real world takes its share.

File formats, in order of preference

1. SVG — vector, infinitely scalable, the professional print format.
2. PNG 2400-4800 px — perfect for Canva, WordPress, flyers and posters.
3. PDF — convenient hand-off format with the code placed on a page.
4. JPEG — acceptable for screens; its compression softens module edges, keep it away from small prints.

Before sending 500 copies to press

Print one at final size on the final material. Scan it: three phones if you can (old Android included), under the real lighting, at the real distance, at an angle. Then — and only then — print the run. And make sure the code is static, so the thing you tested is the thing that keeps working: see Do QR codes expire? for why that matters more than any print setting.

Frequently asked questions