QR codes are everywhere — menus, business cards, ads, Wi-Fi signs. This guide shows how to generate a QR code online for free in seconds, for any type of content.
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Generate QR Code Free →What Is a QR Code?
QR (Quick Response) codes are 2D barcodes that smartphones can scan to instantly open a URL, connect to WiFi, save a contact, or trigger other actions. They store data as a pattern of black and white squares.
Types of QR Codes You Can Create
| Type | Use Case | Example |
|---|---|---|
| URL | Link to website | https://example.com |
| Text | Plain message | Any text content |
| Pre-filled email | Opens mail app | |
| Phone | Tap to call | +1-555-0100 |
| WiFi | Auto-connect to network | SSID + password |
QR Code Error Correction
QR codes have built-in error correction that lets them be read even if partially damaged or obscured. There are 4 levels: L (7%), M (15%), Q (25%), H (30%). Higher correction means the code can handle more damage but becomes denser. For printed materials, use Q or H. For screens, L or M is fine.
Best Practices for Printing QR Codes
- Minimum print size: 2cm × 2cm (for standard scanning distance)
- High contrast: dark code on light background
- Download as PNG at high resolution before printing
- Always test scan before publishing
Frequently Asked Questions
Do QR codes expire?
Static QR codes (like those linking to a fixed URL) never expire. They work as long as the destination URL is live.
Can I put a logo in a QR code?
Yes, with high error correction (H level), up to 30% of the code can be obscured — including a small logo — and it still scans correctly.
How much data can a QR code store?
Up to 4,296 alphanumeric characters or 7,089 numeric digits. URLs typically use 50–200 characters, well within limits.
Is the QR code free to use commercially?
Yes. The QR code format is open standard and royalty-free.