QR Code Generator — Free HTML CSS JS Snippet

<div class="demo">
  <div class="qr-card">
    <label class="field">
      <span>Text or URL</span>
      <input type="text" class="qr-input" value="https://webdevpuneet.com" placeholder="Type something to encode..." />
    </label>
    <div class="row">
      <label class="field small">
        <span>Code colour</span>
        <input type="color" class="qr-fg" value="#1f2937" />
      </label>
      <label class="field small">
        <span>Background</span>
        <input type="color" class="qr-bg" value="#ffffff" />
      </label>
    </div>
    <div class="qr-preview">
      <canvas class="qr-canvas"></canvas>
    </div>
    <button class="download-btn" type="button">Download PNG</button>
  </div>
</div>

.demo {
  font-family: 'Segoe UI', system-ui, sans-serif;
  display: flex;
  justify-content: center;
  padding: 28px;
  background: #f1f5f9;
}
.qr-card {
  width: 100%;
  max-width: 340px;
  background: #fff;
  border-radius: 16px;
  border: 1px solid #e2e8f0;
  box-shadow: 0 14px 36px rgba(15,23,42,0.08);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: #475569;
}
.field input[type="text"] {
  font-size: 14px;
  font-weight: 400;
  padding: 9px 12px;
  border-radius: 8px;
  border: 1px solid #cbd5e1;
  outline: none;
  font-family: inherit;
}
.field input[type="text"]:focus {
  border-color: #6366f1;
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.row {
  display: flex;
  gap: 14px;
}
.field.small {
  flex: 1;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}
.field.small input[type="color"] {
  width: 38px;
  height: 28px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  background: none;
}
.qr-preview {
  display: flex;
  justify-content: center;
  align-items: center;
  background: #f8fafc;
  border: 1px dashed #cbd5e1;
  border-radius: 12px;
  padding: 16px;
  min-height: 200px;
}
.qr-canvas {
  border-radius: 8px;
  max-width: 100%;
}
.download-btn {
  border: none;
  background: #4f46e5;
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease;
}
.download-btn:hover { background: #4338ca; }

const input = document.querySelector('.qr-input');
const fg = document.querySelector('.qr-fg');
const bg = document.querySelector('.qr-bg');
const canvas = document.querySelector('.qr-canvas');
const downloadBtn = document.querySelector('.download-btn');

let timer = null;

function render() {
  const text = input.value.trim() || ' ';
  QRCode.toCanvas(canvas, text, {
    width: 220,
    margin: 1,
    color: { dark: fg.value, light: bg.value },
  }, (err) => {
    if (err) console.error(err);
  });
}

function scheduleRender() {
  clearTimeout(timer);
  timer = setTimeout(render, 200);
}

input.addEventListener('input', scheduleRender);
fg.addEventListener('input', render);
bg.addEventListener('input', render);

downloadBtn.addEventListener('click', () => {
  const link = document.createElement('a');
  link.download = 'qr-code.png';
  link.href = canvas.toDataURL('image/png');
  link.click();
});

render();