無料QRコードジェネレーター

// Install package
npm install qrcode

// Basic usage
const QRCode = require('qrcode');

// Generate QR code and save as image
QRCode.toFile('qrcode.png', 'https://all-tools.online', {
  color: {
    dark: '#000000',
    light: '#FFFFFF'
  },
  width: 512,
  errorCorrectionLevel: 'M'
}, function (err) {
  if (err) throw err;
  console.log('QR code saved!');
});

// Generate as Data URL (for web)
QRCode.toDataURL('https://all-tools.online')
  .then(url => {
    console.log(url);
    // Use this URL in <img src="...">
  })
  .catch(err => console.error(err));

// Generate as SVG string
QRCode.toString('https://all-tools.online', {
  type: 'svg'
}, function (err, string) {
  if (err) throw err;
  console.log(string);
});

// Advanced options
const options = {
  errorCorrectionLevel: 'H',  // L, M, Q, H
  type: 'image/png',
  quality: 0.92,
  margin: 1,
  color: {
    dark: '#2563eb',
    light: '#f3f4f6'
  },
  width: 1024
};

QRCode.toDataURL('https://all-tools.online', options)
  .then(url => {
    // Use the QR code
  });

<!-- Include from CDN -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/qrcodejs/1.0.0/qrcode.min.js"></script>

<div id="qrcode"></div>

<script>
  // Generate QR code
  var qrcode = new QRCode(document.getElementById("qrcode"), {
    text: "https://all-tools.online",
    width: 512,
    height: 512,
    colorDark : "#000000",
    colorLight : "#ffffff",
    correctLevel : QRCode.CorrectLevel.H
  });

  // Update QR code
  qrcode.clear();
  qrcode.makeCode("New content here");
</script>