QR Code Best Practices: The Complete Checklist for Any Deployment

1. Payload

* Keep the URL short to minimise version and module density. * Use HTTPS only. * Link to a page that is live and tested before printing. * Avoid session-based or expiring URLs in permanent print.

2. Symbol Design

* Error correction: M for clean environments, Q for outdoor, H if adding a logo. * Module size: at least 0.5 mm on coated stock. * Quiet zone: at least 4 modules on all sides. * Contrast: dark modules on a light background, not the reverse, and at least 4:1 luminance ratio. * Logo coverage: max 15% of symbol area at level H only.

3. Print and Materials

* Use vector SVG or 300 dpi PNG minimum. * Match substrate to environment: coated stock indoors, weatherproof material outdoors. * CMYK black: 100K, not rich black. * Test a print proof before a full run.

4. Security

* Validate destinations before publishing. * Use tamper-evident mounting in public locations. * Monitor for sticker overlays and audit regularly.

5. Accessibility

* Print the destination URL in text near the code. * Add alt text to digital QR images. * Ensure the linked page meets WCAG 2.1 AA.

6. Measurement

* Use a separate short path per placement. * Track visits, sessions, and conversions from each source. * Document every code, its destination, and its placement.