QR Code Generator

What is a QR Code and How Does it Work?

A QR (Quick Response) code is a two-dimensional barcode that can be scanned by any smartphone camera to instantly open a URL, connect to WiFi, dial a phone number, or perform other actions. Originally developed in Japan for automotive manufacturing, QR codes have become ubiquitous in marketing, payments, and information sharing worldwide.

QR Code Types Explained

• URL QR codes – Direct scanners to a website instantly. Best for marketing, business cards, and posters.
• WiFi QR codes – Allow guests to join your network without typing a password. Perfect for coffee shops and offices.
• Email QR codes – Pre-fill recipient, subject, and body in the user's email app.
• vCard QR codes – Share contact information that users can save directly to their phone.
• Event QR codes – Share calendar event details in iCalendar format.

Error Correction in QR Codes

QR codes include built-in error correction using Reed-Solomon codes. This allows a QR code to remain scannable even if up to 30% of the code is damaged, dirty, or obscured. This is why you can add logos inside QR codes — as long as the logo covers less than ~30% of the code area.

Best Practices for QR Codes

• Use high contrast colors — dark foreground on light background scans best
• Always test your QR code before printing or publishing
• Use a minimum size of 2cm × 2cm for print materials
• Add a clear call-to-action near the code ("Scan to visit our website")
• For dynamic QR codes, use a URL shortener so you can update the destination