High Resolution QR Code

What is Resolution for QR Codes?

Resolution refers to DPI (dots per inch), which measures print quality. Higher DPI = sharper, crisper printed codes.

Size Specifications

Standard Sizes for Print

• Small: 1" × 1" (25mm) - Good for labels
• Medium: 2" × 2" (50mm) - Product packaging
• Large: 3" × 3" (75mm) - Posters and signage
• Extra Large: 4" × 4" (100mm) - Billboard/outdoor

Pixel to Size Conversion (300 DPI)

Python - Generate High Resolution

import qrcode
from PIL import Image

def create_high_res_qr(data, filename, dpi=300, size_inches=2):
    """
    Create high resolution QR code for print.
    
    Args:
        data: URL or text to encode
        filename: Output filename
        dpi: Dots per inch (300 is standard)
        size_inches: Final print size in inches
    """
    # Calculate pixels needed
    pixels = int(size_inches * dpi)
    
    # Generate QR
    qr = qrcode.QRCode(
        version=1,
        error_correction=qrcode.constants.ERROR_CORRECT_H,
        box_size=10,
        border=2,
    )
    qr.add_data(data)
    qr.make(fit=True)
    
    # Create image at high resolution
    img = qr.make_image(fill_color='black', back_color='white').convert('RGB')
    
    # Resize to exact print size
    img = img.resize((pixels, pixels), Image.Resampling.LANCZOS)
    
    # Save with DPI metadata
    img.save(filename, dpi=(dpi, dpi))
    print(f'High-res QR saved: {filename} ({size_inches}"×{size_inches}" at {dpi} DPI)')

# Usage
create_high_res_qr('https://example.com', 'qrcode_300dpi.png', dpi=300, size_inches=2)

Best Practices for Print

• Use 300 DPI Minimum - Professional standard
• PNG Format - Lossless quality
• Black and White Only - Avoid gradients
• No Compression - Save uncompressed
• Test Print - Always test-scan before production
• CMYK Color Space - For commercial printing

File Format Recommendations

For Digital Use

• PNG (lossless, recommended)
• TIFF (professional print prep)

For Professional Printing

• TIFF (at 300 DPI or higher)
• EPS (vector format, scalable)
• PDF (embedded fonts and colors)

Create High-Resolution QR