QR Code
Generator
Generate QR codes from any URL or text. Customize size and color, download as PNG.
36 chars
Higher = more damage-resistant but denser
Master QR Codes Completely
How QR codes work, their types, business applications, and design best practices — fully explained.
What Is a QR Code?
QR codes (Quick Response Codes) were developed by Denso Wave in 1994. They store data in two dimensions (horizontal and vertical), holding far more information than traditional barcodes. With smartphones reading them instantly, QR codes have spread to payments, marketing, logistics, and authentication.
Data Types QR Codes Can Store
- URL: Direct users to websites or landing pages
- vCard: Transfer business card info (name, phone, email) digitally
- Wi-Fi: Share WiFi SSID and password without typing
- SMS/メール: Pre-fill SMS or email for one-tap sending
- テキスト: Embed any plain text directly in the code
Static vs Dynamic QR Codes
Static QR codes (generated by this tool) embed data directly in the code. Cannot be changed after generation but work indefinitely. Dynamic QR codes use redirect URLs that can be changed later, but typically require paid services.
QR Code Use Cases
In-store payments
WeChat Pay, LINE Pay, PayPay etc.
Digital menus
Contactless restaurant menu viewing
Tickets & boarding passes
Electronic airline & concert tickets
Logistics & inventory
Package tracking and stock scanning
Authentication & 2FA
Google Authenticator compatible apps
QR Code Design Best Practices
QR codes can be colorful or include logos, not just black and white. However, several important rules must be followed to maintain scannability. Higher error correction levels allow scanning even if part of the code is damaged.
Error Correction Levels (ECC)
- L（7%）: Minimal correction. Maximum data capacity.
- M（15%）: Best for standard use. Well balanced.
- Q（25%）: Recommended for industrial applications.
- H（30%）: Best when embedding logos. Most robust.
QR Code Design Rules
- Light background, dark foreground (dots)
- Maintain contrast ratio of at least 4:1
- Always leave a quiet zone (margin) around the code
- Minimum print size is 2cm × 2cm
Level L (7%)
Simple URL
Level M (15%)
General use (recommended)
Level Q (25%)
Industrial / logistics
Level H (30%)
Logo embedding / print