QR Code Practical Guide

What is a QR code?

A QR code is a two-dimensional barcode that stores text or URLs and can be scanned by most smartphone cameras. It bridges offline and online experiences quickly.

Common real-world use cases

• Store menus and table ordering
• Event check-in tickets
• Product packaging with manuals
• Contact cards (vCard)
• Wi‑Fi sharing in cafés or offices
• Posters and flyers linking to campaigns

Design tips for better scan rates

• Keep strong contrast: dark foreground on light background.
• Leave a quiet zone (margin) around the code.
• Don’t stretch or distort the code; keep it square.
• Test with multiple devices before publishing.

Security and trust

Use HTTPS URLs, avoid suspicious short links, and never encode sensitive personal data. If the destination changes, update the printed materials as well.

Printing tips

• For print, target 300 DPI and a minimum size of 2.5–3 cm.
• Use matte surfaces to reduce glare.
• Always run a real-world scan test at viewing distance.

Error correction levels

Error correction improves scanability when a code is damaged. Higher levels tolerate more damage but store less data.

• L (Low): about 7% recovery, good for clean prints.
• M (Medium): about 15% recovery, balanced choice.
• Q (Quartile): about 25% recovery, helpful with small logos.
• H (High): about 30% recovery, best for harsh environments.

Troubleshooting checklist

• Check contrast and avoid light colors for the code.
• Increase size if scans fail from distance.
• Remove busy backgrounds behind the code.
• Simplify the encoded URL or text.

Landing page and destination tips

Make sure the destination page loads quickly, is mobile-friendly, and matches what the QR promises. Keep the path stable so printed materials don’t break over time.

Accessibility and inclusivity

Add a short text URL near the QR for users who can’t scan, and ensure contrast for people with visual impairments.