QR Code Generator Tutorial
Detailed guide, best practices, and FAQ
Use Cases
The QR code generator is useful for URL links, Wi-Fi password sharing, product labels, event posters, contact cards, and more. Use it when you need users to quickly access a URL via phone or scan to join a Wi-Fi network.
Features
- Custom colors: freely mix foreground and background colors
- Logo embedding: upload a logo in the center, auto-switches to H error correction
- Error correction levels: L/M/Q/H selectable (auto H when logo is enabled)
- Multiple sizes: 128px to 1024px freely adjustable
- PNG download: high-quality image ready to use
Examples
Example 1: Scenario 1: Generate a website QR code with brand colors and a logo in the center, download and print it on flyers.
Example 2: Scenario 2: Generate a Wi-Fi QR code using the format: `WIFI:T:WPA;S:NetworkName;P:password;;` — guests scan to connect.
Example 3: Scenario 3: Generate a vCard QR code with name, phone, and email — scan to add a contact.
Best Practices
- Always use H error correction when embedding a logo (the tool auto-switches)
- Keep the logo under 20% of the QR code size to ensure scannability
- Ensure high contrast between foreground and background (dark foreground + light background recommended)
- For printing, export at 512px or higher; 256px is enough for screen display
FAQ
Why can't my generated QR code be scanned?
Common causes: content too long (URLs should be < 100 characters), low contrast between foreground and background, logo too large covering key modules, or low error correction level. The tool auto-switches to H level when a logo is enabled.
Is there a content length limit for QR codes?
Yes. QR capacity depends on version (1-40) and error correction level. URLs should generally be under 100 characters; longer content reduces scannability.
Is my uploaded logo saved to a server?
No. The logo is processed entirely in your browser and never uploaded.