vCard QR
vCard QR Code
A QR code encoding contact information in vCard format, scannable to add a contact directly to a phone.
รายละเอียดทางเทคนิค
vCard QRs encode data in a 2D matrix of black and white modules (squares). Version 1 is 21x21 modules; version 40 is 177x177, storing up to 4,296 alphanumeric characters. Four error correction levels (L:7%, M:15%, Q:25%, H:30%) add Reed-Solomon redundancy, allowing data recovery from damaged or partially obscured codes. The three large finder patterns in corners enable orientation detection, while alignment patterns (added in version 2+) compensate for surface curvature and printing distortion.
ตัวอย่าง
```javascript
// QR code generation with error correction
const qr = generateQR({
data: 'https://peasytools.com',
size: 256, // pixels
errorCorrection: 'M', // L(7%), M(15%), Q(25%), H(30%)
margin: 4, // quiet zone modules
});
// Output as SVG (scalable, smallest file size)
document.getElementById('qr').innerHTML = qr.toSVG();
```
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A
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