Flyers: The Arm's-Length Scan
A flyer is usually picked up, held at arm's length — roughly 40 to 60 cm from the eyes — and scanned within a few seconds, before the reader decides whether to keep it or recycle it. That brief window is your entire opportunity: the QR code must decode on the first or second attempt, because nobody rescans a flyer that failed once. Flyer scanning happens everywhere — cafés, campuses, community boards — in lighting you cannot control, on phones you cannot predict.
The 10:1 Rule of Thumb
As a practical rule of thumb, divide the expected scanning distance by ten to get the minimum QR code width. For a flyer held at 45 cm: 45 ÷ 10 = 4.5 cm, or 45 mm. Treat this as guidance rather than a guarantee, then add margin for real-world conditions like dim café lighting or older phone cameras. A 50 mm code on a standard A5 or US Letter flyer is the reliable target most designers land on, and it leaves comfortable room for the required quiet zone.
Recommended Size
Print the code at least 50 × 50 mm (about 2 inches square). On an A5 flyer (148 × 210 mm), a 50 mm code plus its quiet zone occupies roughly a third of the page width — large enough to scan from arm's length, small enough to leave room for the headline, the offer, and branding. If the flyer will be read in dim venues (clubs, evening events), step up to 55–60 mm rather than hoping for the best.
Substrate and Printing
Flyers are typically printed on 150–250 gsm coated or uncoated paper by offset lithography or a digital press. Uncoated stock absorbs ink into its fibers and softens module edges, so if you print on uncoated paper, stay at the upper end of the size range and avoid dense QR versions with tiny modules. Always supply the code as vector SVG or PDF. A 72 DPI web JPEG scaled up to print size will blur module boundaries and produce a code that looks fine on screen and fails on paper.
Placement and Practical Tips
- Keep the code out of fold lines on bi-fold or tri-fold flyers; a crease running through the symbol is one of the most common flyer failures.
- Give the code a quiet zone of at least four modules on all sides, and never let background photos or patterns touch it — place it on a solid white or light panel.
- Put a short call to action next to the code ("Scan for the menu", "Scan to RSVP"). Codes without context get ignored, no matter how well printed.
- Keep the linked URL short. A 200-character URL forces a dense QR version with tiny modules; a short redirect keeps modules large and forgiving.
- Proof on the actual stock. A code that scans beautifully on your laser proof can behave differently on the job's uncoated sheet.
Common Mistakes
- Shrinking the code to squeeze in one more line of text. If space is tight, shorten the URL — not the code.
- Printing in brand colors with weak contrast. Dark modules on a light background remain the most reliable combination in uncontrolled lighting.
- Forgetting to test: scan the printed flyer — not the screen proof — with two different phones before approving the full run.