📱 How to Use
- Enter text, URL, or any data you want to encode
- Adjust size (150-800px) and error correction level
- Download the QR code as a PNG image
- Test scanning with your phone before printing
🎯 Common Use Cases
🌐 Website Links
Share website URLs on business cards, flyers, or menus
📇 Contact Info
Encode vCard data for easy contact sharing
📶 WiFi Access
Share WiFi credentials without typing passwords
🎫 Event Tickets
Create scannable tickets for events and venues
🔒 Privacy & Security
Your privacy is safe with us. The QR code generation is performed locally within your browser using client-side scripts. No data, URLs, or custom text inputs are ever sent to our servers. Learn more in our Privacy Policy.
📖 What is a QR Code and How Does it Work?
A QR Code (Quick Response Code) is a type of two-dimensional (matrix) barcode first designed in 1994 for the automotive industry in Japan. A barcode is a machine-readable optical label that contains information about the item to which it is attached. In practice, QR codes often contain data for a locator, identifier, or tracker that points to a website or application.
Unlike traditional one-dimensional barcodes that are read by a narrow beam of light, a QR code is detected by a 2D image sensor (like a smartphone camera) and digitally analyzed by the programmed processor. The processor locates the three distinctive squares at the corners of the code structure, utilizing a smaller square near the fourth corner to normalize the image for size, shape, and angle of viewing.
Understanding QR Code Error Correction
QR codes use Reed-Solomon error correction, which allows the code to be read correctly even if it is partially dirty, scratched, or damaged. There are four error correction levels:
| Level | Recovery Capacity | Best For |
|---|---|---|
| Level L (Low) | ~7% of codewords can be restored | High-density codes with clean digital display. |
| Level M (Medium) | ~15% of codewords can be restored | Standard choice for flyers, cards, and labels. |
| Level Q (Quarter) | ~25% of codewords can be restored | Industrial environments subject to minor smudging. |
| Level H (High) | ~30% of codewords can be restored | Printers placing custom icons in the center of the code. |
Best Practices for Printing QR Codes
- Size Matters: A physical QR code should be at least 2cm x 2cm (approx 0.8" x 0.8") to ensure standard phone cameras can focus and read it correctly.
- Maintain High Contrast: Always use a dark color for the foreground modules against a light background. Light codes on dark backgrounds (inverted) are difficult for many scanning apps.
- Quiet Zone: Leave a border of empty space (equal to about 4 modules) around the QR code. This helps scanner software locate the code margins.
❓ FAQ
How do I create a QR code? ▼
Simply enter your text or URL in the input field, and a QR code will be generated automatically. You can then download it as a PNG image.
What size should I use for printing? ▼
For printing, use at least 300px. For business cards, 200-300px works well. For posters or signs, use 500-800px for best quality.
What is error correction? ▼
Error correction allows QR codes to be scanned even if partially damaged. Higher levels (H) provide more recovery but create more complex codes. Medium (M) is recommended for most uses.
Can I use QR codes for WiFi passwords? ▼
Yes! You can encode WiFi credentials in a specific format that smartphones recognize and automatically connect to.
Is my data private? ▼
Yes. All QR code generation happens entirely in your browser. Your data never leaves your device.