QR Code Generator

QR Code Technology Explained

How QR Codes Work

QR codes use a matrix of black and white squares to encode data in a two-dimensional pattern. The code contains:

• Position Markers - Three large squares in corners for orientation detection
• Alignment Patterns - Smaller squares for distortion correction
• Timing Patterns - Alternating modules to determine module coordinates
• Data Region - The actual encoded information
• Error Correction - Reed-Solomon codes for damage recovery

How Scanning Works

1. Camera captures the QR code image
2. Software detects position markers to determine orientation
3. Image is normalized and converted to binary data
4. Error correction algorithms fix any damage or distortion
5. Data is decoded and presented to user

QR Code Capacity

QR codes can store different amounts of data depending on the character type:

• Numeric Only - Up to 7,089 characters
• Alphanumeric - Up to 4,296 characters
• Binary/Byte - Up to 2,953 bytes
• Kanji/Kana - Up to 1,817 characters

Note: More data = larger, more complex QR code = harder to scan at small sizes

Best Practices for QR Codes

Design Guidelines

• Contrast - Use dark colors on light backgrounds (minimum 40% contrast)
• Size - Minimum 2cm x 2cm for reliable scanning
• Quiet Zone - Leave empty border around code (4 modules minimum)
• Testing - Test with multiple devices and scanning apps before printing
• Format - Use vector (SVG) for print, PNG for digital

Placement Tips

• Place at eye level or easily accessible height
• Ensure good lighting - avoid shadows and glare
• Flat surfaces work better than curved or textured ones
• Add a call-to-action text: "Scan for more info", "Scan to connect", etc.
• Consider viewing distance - larger codes for farther viewing

Common Mistakes to Avoid

• ❌ Using very light colors or low contrast combinations
• ❌ Making QR codes too small for the scanning distance
• ❌ Printing on wrinkled, folded, or damaged materials
• ❌ Placing codes where people can't easily scan them