How to Generate QR Codes with Custom Designs

Custom QR Code Generation

QR codes support significant visual customization without sacrificing functionality, thanks to built-in error correction. Understanding the technical constraints lets you create branded codes that scan reliably.

Error Correction Levels

QR codes have four error correction levels: L (7%), M (15%), Q (25%), and H (30%). The percentage indicates how much of the code can be obscured or damaged while remaining scannable. For branded QR codes with logos, use level H — this lets you place a logo over up to 30% of the code area. For plain codes, level M offers a good balance between data density and resilience.

Color Customization

Dark modules must contrast against light modules with a minimum 40% luminance difference for reliable scanning. You can use brand colors as long as this contrast ratio is maintained. Avoid red/green combinations that are problematic for colorblind users. The quiet zone (white border) must be maintained — it's at least 4 modules wide on all sides.

Adding Logos

Center logos work best because QR scanners typically start reading from the corner finder patterns. Keep the logo within the center 20-25% of the code area. Use a white background behind the logo to create a clean boundary. Always test the final code with multiple scanner apps — what works on one may fail on another.

Output Formats

Generate QR codes as SVG for web use — they scale perfectly to any size. Use PNG at minimum 300 DPI for print materials. For very small physical sizes (under 2cm), simplify the code by using shorter URLs and lower error correction to reduce module density.