UnitNov
Everyday Online Tools
πŸ“± Developer & Marketing Utility

QR Code Generator

Create static, permanent QR codes for websites, WiFi networks, contact details, and plain text with custom colors and instant vector SVG or PNG downloads.

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Live QR Preview
Generating QR...

Encodes: https://unitnov.com

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The 10:1 Scanning Distance Ratio Formula

To ensure reliable scanning across all camera sensors, follow the industry standard 10:1 Distance-to-Size ratio:

Minimum QR Width = Scanning Distance / 10
Handheld PrintBusiness cards and menus at 20 cm scan distance require minimum 2 cm Γ— 2 cm (0.8 in).
Store PostersWall posters viewed from 1.5 meters require minimum 15 cm Γ— 15 cm (6 in).
Outdoor SignageBillboards scanned from 10 meters away require minimum 100 cm Γ— 100 cm (1 meter).

Reed-Solomon Error Correction Levels

QR codes embed redundant data packets so they remain readable even if smudged, torn, or overlaid with a brand logo:

Level L (Low)Recovers up to 7% missing data. Best for dense data on screens.
Level M (Medium)Recovers up to 15% missing data. The standard for marketing flyers.
Level Q (Quartile)Recovers up to 25% missing data. Recommended for industrial and transit prints.
Level H (High)Recovers up to 30% missing data. Essential when superimposing custom logos in the center.

Best Practices for High-Scan-Rate QR Codes

1. Contrast Matters

Always maintain high contrast between the foreground and background colors. Dark QR codes on bright white backgrounds scan reliably across all smartphone cameras and low-light environments.

2. Minimum Print Sizing

For standard business cards or flyers, ensure the printed QR code is at least 0.8 Γ— 0.8 inches (2 Γ— 2 cm). For posters or billboards, increase the size proportionally based on viewing distance.

3. Static vs Dynamic Codes

Static QR codes encode the data directly without relying on third-party URL shorteners. This ensures the QR code never breaks, even decades later.

Frequently Asked Questions

Common questions and detailed answers regarding calculations and formulas.

No! UnitNov creates direct static QR codes. The destination URL or data is encoded directly into the pixel pattern, meaning your QR codes will work forever with zero expiration, zero limits, and zero tracking redirects.

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