Printing QR Codes: Size, Contrast and Quiet Zone
Published: 2026-08-31 · Updated: 2026-08-31
A QR code that scans perfectly on screen can fail on paper. Print introduces three things a screen does not: physical size, ink and paper behaviour, and the distance between the code and the camera. Plan for all three.
1. Size
A practical rule: the code should be at least one tenth of the scanning distance. A code scanned from 30 cm should be 3 cm wide; a poster scanned from 2 m should be 20 cm wide. Independent of distance, do not go below 2 cm for short URLs or 3 cm for dense codes such as vCards.
2. Quiet zone
Keep the blank margin of four modules around the code. Designers often crop it to make the code “fit” — that is the single most common reason printed codes fail. If your layout has a colored background, the quiet zone must be the same light color as the code background, not the layout color.
3. Contrast and color
- Dark modules on a light background. Never invert (light modules on dark) — many scanners cannot read it.
- Aim for a contrast ratio of at least 3:1; 4.5:1 or higher is safer. The generator warns you when it is low.
- Avoid red-on-white and yellow: cameras see them as light colors.
- Glossy paper and metallic ink cause reflections; matte finishes scan more reliably.
4. Resolution and format
Use SVG whenever your printing workflow accepts it — it is resolution-independent. If you must use PNG, download at least 1024 px and place it at or below its native size. Never scale a 256 px PNG up to a poster.
5. Error correction
M is fine for indoor cards and flyers. Use Q or H for anything that will be outdoors, handled a lot, or laminated (lamination can add glare and small distortions).
Pre-print checklist
- Print a proof at the final size on the final paper.
- Scan it with an iPhone and an Android phone, from the intended distance, under the intended lighting.
- Check the quiet zone is intact in the layout file.
- Confirm the encoded URL or details are correct — a printed typo is permanent.