Qrcode Help & Guide

What is a QR Code?

QR codes (Quick Response) are 2D barcodes that can store much more data than traditional barcodes. They can encode text, URLs, contact info, WiFi credentials, and more.

Error Correction Levels

• L (Low): 7% recovery — Smallest, best for clean environments
• M (Medium): 15% recovery — Good balance
• Q (Quartile): 25% recovery — Good for industrial use
• H (High): 30% recovery — Best for damaged QR codes

Size vs Data

More data = larger QR code = harder to scan. Consider:

• Use URL shorteners for long URLs
• Higher error correction = larger QR code
• Minimum version depends on data amount

Problem: QR Code Won't Scan

Causes:

• Too much data (reduce or use URL shortener)
• Low error correction + damage
• Too small size
• Low contrast (white/black not distinct enough)

Solutions:

• Increase error correction to H
• Increase QR size
• Add quiet zone (white border)
• Ensure good contrast

Problem: URL Too Long

Solution: Use a URL shortener like bit.ly or TinyURL to create shorter QR codes.

Best Practices

• Size matters: Minimum 1cm (0.4 inch) for reliable scanning
• Test with your phone: Always test with multiple devices
• Leave quiet zone: White space around QR code
• Use high contrast: Black on white works best

Creative QR Codes

Custom colors work but keep it simple:

• Use dark colors on light backgrounds
• Avoid gradients in QR patterns
• Logo in center: use H-level error correction

Common Use Cases

• URLs: https://example.com/page
• WiFi: WIFI:T:WPA;S:NetworkName;P:password;;
• vCard: Contact information
• Email: mailto:[email protected]