How this guide is maintained
QRFlow guides are written against the current generator behavior, payload formatting rules, export paths, and print or scan checks in the product. They are meant to help users finish a QR workflow, not to exist as standalone SEO filler.
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Use cases & print ideas
Matching pages that explain where this QR type works best before you open the generator.
Poster QR codes usually fail because they’re too small for the distance or placed where glare/shadows kill contrast. Here’s a practical sizing rule.
Rule of thumb (simple)#
A practical guideline: QR size ≈ scan distance ÷ 10. Example: if people scan from ~2 meters, aim for ~20 cm QR. If you’re unsure, go bigger.
Distance → recommended QR size#
Use the larger end if your payload is long (UTM-heavy links, big vCards) or the print quality is not perfect.
| Typical scan distance | Recommended QR size |
|---|
| 0.5 m (arm’s length) | 5–7 cm |
| 1 m (standing close) | 8–12 cm |
| 2 m (hallway / wall poster) | 15–25 cm |
| 5 m (big signage) | 40–60 cm |
Placement tips that matter#
- Put the QR on a flat, matte surface if possible (glossy reflections are scan killers).
- Keep a clean quiet zone (blank margin) around the QR — do not let background graphics touch the edges.
- Avoid heavy shadows and extreme angles. Keep it at a comfortable height (roughly chest/eye level).
- If the QR points to a URL, keep it short and stable (see: Short URL strategy).
Export for print#
Use SVG so edges stay sharp at large sizes. If you must use PNG, export high resolution and never upscale later. See: SVG vs PNG.
Fast test routine (do this once)#
- Print a test on the same material/finish.
- Scan on iPhone + Android under the real lighting.
- Test from the real distance (don’t test at 20cm if users will be 2m away).
- If it’s slow: increase size first, then simplify payload.
Use 20-25 mm (0.8-1.0 in) for most business cards. Includes minimum size guidance for short URLs, larger sizing for vCards, quiet zone rules, and a card dimensions chart.
How to add a QR code to a business card (visiting card) in Canva: generate the right QR (vCard vs URL), download SVG/PNG, keep a quiet zone, and export for print.
Canva QR code generator: create a URL QR in Canva, or generate vCard/WiFi/social QR codes with QRFlow and upload — plus print-ready export tips.
Short answer: usually yes for print. SVG stays sharp when resized, while PNG is fine for screens if exported large enough and never upscaled.
Why quiet zone is non-negotiable, how to choose colors that scan, and what backgrounds (patterns, gradients) break QR detection.
Pick the right error correction level for print/screens/logos. Learn the trade-off: higher correction = denser QR = needs larger print.
Quick answers
Common questions
What size should I print for reliable scans?
Use 20-25 mm for business cards and scale up for posters or distance scans.
Which download format is best for print?
Use SVG for crisp edges at any size. PNG is best for screens only.
Try it now
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