Error Correction Level
QR Code Error Correction
The amount of redundant data in a QR code: L (7%), M (15%), Q (25%), or H (30%) recovery capacity.
รายละเอียดทางเทคนิค
Error Correction Levels 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();
```
เครื่องมือที่เกี่ยวข้อง
Q
QR Data Analyzer
Q
QR Capacity Reference
W
Wi-Fi QR Config Builder
V
vCard QR Builder
E
Error Correction Calculator
B
Barcode Format Reference
B
Barcode Validator
Q
QR Data Formatter
E
Event QR Generator
E
Email QR Generator
S
SMS QR Generator
G
Geo Location QR Generator
P
Phone Call QR Generator
M
MeCard Generator
A
App Store Link Generator