QR Code Generator Guide

What Is a QR Code?

A QR code (Quick Response Code) is a 2D barcode invented by Denso Wave in 1994. Your phone camera scans it to instantly access information. Today it's used everywhere: mobile payments, business cards, WiFi sharing, product tracking, and more.

Four Common Use Cases

1. URL QR Codes

Convert a URL to a QR code, print it on business cards, flyers, or posters. People scan and open your website instantly — no typing required.

2. WiFi QR Codes

Encode your WiFi name and password into a QR code, stick it on the wall. Guests scan and connect — no need to spell out the password. Format: WIFI:T:WPA;S:NetworkName;P:Password;;

3. Plain Text QR Codes

Any text — promo codes, serial numbers, product descriptions — can be turned into a QR code. Scan to reveal the text instantly.

4. Contact QR Codes

Encode name, phone, email into a QR code. Scanning saves the contact directly to the phone's address book. Perfect for trade shows and networking events.

QR Code Best Practices

Size: minimum 2cm × 2cm; larger for longer scan distances. Contrast: dark code on light background, avoid busy patterns. Error correction: QR codes have 4 levels (L/M/Q/H); Level H still works even if 30% is damaged. Format: PNG for printing, SVG for scaling.

FAQ

How much data can a QR code hold?

Up to 4,296 digits. Less data = smaller code = faster scanning.

Error correction levels?

L(7%), M(15%), Q(25%), H(30%). Level H works even if 30% damaged.

How to improve scan success?

Minimum 2cm×2cm, high contrast, avoid blur and glare.