QR Code Size Guide: Minimum Sizes for Every Use Case

The standard sizing rule: code width = scanning distance / 10. A 2 cm code scans from 20 cm. A 4 cm code scans from 40 cm. A 10 cm code scans from 1 meter. A 50 cm code scans from 5 meters.

The formula assumes ideal conditions — clean print, good lighting, modern flagship phone, perpendicular scan angle, error correction M, short payload. Real-world deployments rarely hit ideal. The safety margin compensates for the gap.

Recommended safety margins:

• 1.25× (formula × 1.25) for clean indoor deployments with controlled lighting, current-flagship audience, short URLs.
• 1.5× for typical indoor deployments — restaurants, retail interior, offices. Mixed phone age, variable lighting.
• 2× for outdoor deployments, older audience devices, long URLs, or any deployment where reliability dominates aesthetics.
• 3× for billboards, high-distance signage, or any deployment where you cannot test in advance.

A QR meant to scan at 1 meter on a restaurant table tent: 10 cm formula, 15 cm with the 1.5× indoor margin. A QR meant to scan from 3 meters at a trade-show booth: 30 cm formula, 60 cm with the 2× outdoor-mixed margin.

Encoded data adjusts the margin. A long URL (100+ characters) needs an additional 20–30% size margin compared to a short URL (under 30 characters) at the same physical area, because the denser pattern has smaller individual modules at the same overall size. The fix is either shortening the URL or using a dynamic QR that encodes a short redirect URL on the vendor's server — see the dynamic vs static guide.

Business cards are scanned at handheld distance — typically 15–30 cm. The 10:1 formula gives 1.5–3 cm minimum; the 1.5× indoor margin pushes to 2–4 cm.

Recommended sizing:

• Minimum: 2 cm × 2 cm (0.8 × 0.8 inches). Below this, older phones in dim restaurant lighting fail intermittently.
• Comfortable: 2.5–3 cm. Works reliably on current and older phones in mixed lighting.
• Maximum reasonable on a 3.5 × 2 inch business card: 3.5 cm. Above this, the QR dominates the card design.

Placement on the card. The back of the card is the right placement for the QR — keep the front clean for the brand assets, photo, and primary contact info. The QR on the back has its own breathing room and doesn't compete with the visual hierarchy of the front.

Label adjacency. A QR with no adjacent text label converts at half the rate of one labeled "Scan to save my contact info" or "Scan for portfolio." The label takes 1–2 lines below the QR and clarifies the intent.

Encoded data discipline. A vCard with name, phone, email, company, and one URL fits comfortably in a 2.5 cm QR at error correction M. Adding a full social URL list, bio, and photo bloats the QR pattern past what a 2.5 cm code can carry reliably. Strip to essentials for business-card QRs — see the best vCard QR generators.

Print quality. Coated 14pt cover stock with matte lamination on the QR area. Glossy lamination creates glare under restaurant lighting. The cost difference is negligible; the reliability difference is meaningful.

Flyers, brochures, table tents, and similar handheld print are scanned at 30–60 cm — the natural distance for someone holding the material in their hands or seated at a table.

Recommended sizing:

• Minimum: 2.5 cm × 2.5 cm.
• Comfortable: 3–4 cm.
• Practical cap on standard letter-sized brochure: 5–6 cm (above this it dominates the layout).

Restaurant table tents specifically: 3–4 cm is the right default. Restaurant lighting is dimmer than office lighting, and the QR competes with the brand assets and menu copy on the tent. Below 3 cm, scan rates drop on older phones in low light; above 4 cm, the QR overwhelms the design.

Multi-QR layouts (menu + WiFi + review on one table tent): each QR at 3 cm, separated with clear adjacent labels ("Scan for menu," "Scan for WiFi," "Scan to review"). Avoid combining functions into a single QR that links to a navigation page — per-job QRs convert at 2–3× the rate of shared hubs.

Direct mail: the same sizing applies, with one caveat — direct mail tends to face moderate folding damage in transit. Use error correction Q or H rather than M to handle minor pattern degradation.

Posters, indoor signage, and storefront window vinyl are scanned at 1–3 meters or more. The 10:1 formula gives 10–30 cm; the safety margin pushes to 15–60 cm depending on conditions.

Indoor posters (1–2 meter scan): 10–15 cm minimum, 15–20 cm comfortable. Trade shows and conference posters benefit from the upper end because the audience is mixed-age and scanning in variable convention-center lighting.

Storefront window vinyl (3–8 feet sidewalk distance): 5–15 cm depending on the storefront layout. Window QRs are scanned 24/7 — including after-hours when the store is closed and passersby use them as a research touchpoint. After-hours scanning is in low ambient light, which pushes toward the upper end of the size range.

Yard signs (real-estate, political, contractor signage): 5–10 cm. Yard sign scanning is typically at 4–8 feet from the sidewalk. The QR competes with the sign's primary message; balance is important.

Trade-show booth signage (2–5 meter scan): 15–30 cm. Booth signage faces variable convention-center lighting and a mix of standing distances; oversizing helps.

Outdoor signage uses exterior-grade vinyl with UV-resistant inks and 5-mil lamination. Standard interior-grade print fades within 4–6 months in direct sun; the right material lasts 2–5 years. See the packaging and labels guide.

Billboards and large-format display are scanned (when at all) from 5+ meters. The QR needs to be 50+ cm; for highway billboards, 100+ cm.

The honest question: should you put a QR on a billboard at all? Most billboard viewers are in moving vehicles and cannot safely scan. The right billboard QR use cases are:

• Stop-and-scan locations: traffic lights, drive-thru lanes, parking-lot adjacent signage. Drivers stop, then scan.
• Indoor large-format signage: airports, malls, conference centers. Pedestrians walking past can stop to scan.
• Transit signage: bus stops, train platforms, subway walls where the audience has dwell time.
• Festival and event large-format: people walk past at a pace that allows scanning.

Highway billboards and freeway signage: skip the QR. The reach is theatrical; the conversion is negligible. Use the billboard for brand and a memorable URL the driver can type later.

For billboards that justify a QR:
- 50+ cm code width.
- Very short encoded URL (under 30 characters, ideally under 20).
- High-contrast colors (black on white at minimum; brand colors with documented 4.5:1+ contrast).
- Adjacent CTA explaining the scan value proposition.
- Test from the actual viewing distance at the actual lighting before committing.

For large-format vinyl and similar print, request specifications from the print vendor — large-format printers often have specific QR-handling guidance for their inks and substrates.

QRs on TVs, monitors, projectors, and broadcast media follow the same distance rules with additional considerations.

Screen resolution. The QR must be rendered with enough screen pixels to make each module sharp. A QR displayed at 200 × 200 screen pixels gives roughly 9 × 9 pixels per module on a 21-module QR — borderline. Render at 400 × 400 screen pixels or larger to give each module 18+ pixels.

Brightness and contrast. Auto-brightness on some TVs and monitors reduces local contrast. Display the QR on a solid white background to maximize contrast against the dark modules.

Display duration. A QR shown for less than 5 seconds gives viewers no time to pull out a phone, open the camera, aim, and scan. Display for at least 8–10 seconds for the audience to convert; longer for broadcast where the scan has to compete with attention to the content.

Screen reflections. In bright rooms, the screen reflects ambient light. Aim the screen away from bright windows and minimize specular reflection from the QR area.

Streaming and recording. A QR shown in a YouTube video or webinar recording stays available for the life of the recording — viewers can pause and scan. The QR needs to encode a URL that stays alive for the recording's expected lifetime (dynamic QRs with cancellation survival, or static QRs encoding stable URLs).

TV scan-through-screen. Some TVs add anti-screen-burn pixel shifting that subtly distorts QRs. Test the QR on the actual TV model before broadcast.

Patterns that show up repeatedly in failed deployments:

Designing the QR to a size budget instead of a scan-distance budget. The brochure layout has a 1.5 cm space in the corner for the QR; the designer fits the QR to the space. The 1.5 cm QR fails to scan from typical reading distance. The fix: size the QR for the scan distance first, then negotiate the layout.

Skipping the safety margin. The 10:1 formula gives the minimum; the deployed QR needs to handle older phones, dim lighting, and angled scans. Apply 1.5–2× safety margin.

Oversizing the QR. A QR that's 30% of a business card looks amateur. Above the comfortable maximum, the QR dominates the design without improving scan rate. Find the comfortable size and stop there.

Treating digital and print sizing as the same problem. Print QR sizing is a physical-distance problem; screen QR sizing is a pixel-density problem. Same formula, different implementation.

Not testing. A QR that looks fine at 100% zoom in a design file fails when printed at the right size on the wrong substrate. Always print a single proof and scan-test before authorizing the batch.

Ignoring the data length adjustment. A long URL needs more physical size to scan reliably than a short URL at the same distance. The fix is shortening the URL or using a dynamic QR — same final size, simpler pattern.

Cropping the quiet zone. A QR that's 4 cm square needs at least 4 mm of quiet zone on each side. Cropping flush to surrounding text or graphics removes the quiet zone and fails the scan even when the QR is otherwise correctly sized.