How QR codes connect physical and digital
Quick Response (QR) codes encode data into a 2D matrix of squares that scanners can read rapidly, bridging print and interactive experiences.
Understanding Error Correction
QR codes use Reed-Solomon error correction to remain readable even when partially damaged or obscured.
Level L recovers ~7% of data, M ~15%, Q ~25%, and H ~30%. Higher levels allow for more customization (like logos) but increase code density.
Customizing Your QR Code
You can change colors as long as there's sufficient contrast between dark and light colors. The dark color should be darker than the light color.
Larger sizes are better for printing, while smaller sizes work for digital displays. Always test scannability after customization.
Design considerations
Quiet zones (margins) ensure scanners can locate the code. A margin of 2-4 modules is recommended.
Custom colors or logos are possible if contrast stays high and error correction is sufficient (Q or H level).
Common applications
- Deep-linking to product pages, app stores, or support articles
- Enabling contactless payments, check-ins, or ticket validation
- Sharing Wi-Fi credentials or digital business cards
- Tracking print collateral performance via unique URLs
Best practices
- Test the code at the physical size you plan to print
- Use high error correction (Q or H) when adding logos or custom designs
- Maintain high contrast between foreground and background colors
- Provide a human-readable fallback (short URL) near the code