QR code sizing: what actually works

A QR code that is too small fails scans; one that is huge wastes space. Use a few simple rules for print and screen.

Minimum size (practical rule of thumb)

For most consumer phones:

• Digital displays — the printed module (the smallest black square) should stay readable; as a rough guide, aim for at least 2–3 cm (about 1 in) square for the whole code on a slide or kiosk at normal viewing distance.
• Print — business cards and flyers need a larger code than posters viewed from far away. If people scan from 30 cm, a 2.5–3 cm code often works; from 1 m, go bigger.

Always test with the least capable device you support (older phones, cracked screens, low light).

Contrast and quiet zone

• Use high contrast (dark on light is safest).
• Keep quiet zone (empty margin) around the code; do not crop it tight to artwork.

Error correction and logo overlays

Higher error correction allows a small logo in the center but increases density. If you add a logo, test scans after export — Nimriz lets you style and download QR assets; validate the final PNG or SVG on real hardware.

Short URLs help

Shorter URLs encode to simpler QR patterns (fewer modules), which can scan more reliably at a given physical size. That is one reason branded short links pair well with QR campaigns.

Nimriz QR notes

Generated QR assets use your short URL. Scan attribution may use a reserved query marker for QR vs click classification; internal parameters are not forwarded to destinations. Details live in Custom QR codes and Analytics definitions.