What is a QR Code?
A QR code (Quick Response code) is a two-dimensional barcode that can store URLs, text, contact information, Wi-Fi credentials, and more. Modern smartphones can scan QR codes instantly using their built-in camera app — no separate scanner app required.
QR codes were originally invented in 1994 by Denso Wave for automotive manufacturing. Today they are ubiquitous in marketing, payments, events, and product packaging.
What Can You Store in a QR Code?
| Data Type | Example Use Case |
|---|---|
| URL | Link to your website or social profile |
| Plain text | Short message or product description |
| Email address | Mailto link for contact |
| Phone number | Click-to-call |
| Wi-Fi credentials | Share network password without typing |
| vCard (contact) | Share business card digitally |
| Bitcoin/payment address | Crypto wallet QR codes |
How to Create a QR Code for Free
FuaHub's QR Code Generator creates print-quality QR codes instantly:
1. Open the [QR Code Generator](/tools/generator/qr-code).
2. Enter your URL, text, or other data.
3. The QR code updates in real-time as you type.
4. Click Download PNG to save a high-resolution image.
No account, no watermarks, no expiration date. The QR code you generate links to whatever data you entered — it works permanently.
Understanding Error Correction Levels
QR codes have built-in error correction that allows them to be read even if partially damaged or obscured:
- Level L (7%): Lowest redundancy, smallest code. Use for clean digital displays.
- Level M (15%): Standard for most applications. Good balance.
- Level Q (25%): Better for codes on packaging that might get scratched.
- Level H (30%): Highest redundancy. Use for printed codes that might be worn.
Tips for QR Code Design
1. Keep it simple: The more data you encode, the denser and harder to scan the code becomes. Short URLs are ideal.
2. Use a URL shortener: If your URL is very long, use a service like bit.ly first to shorten it.
3. Test before printing: Always scan your QR code with at least two different phones before printing thousands of brochures.
4. Contrast matters: Black on white provides maximum contrast. Colored QR codes must still maintain sufficient contrast for reliable scanning.