index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./style.css" />
    <title>Document</title>
  </head>
  <body>
    <div class="container">
      <p>Enter your text or URL</p>
      <input type="text" placeholder="Text or Url" id="qrtext" />
      <button onclick="generateqr()">Generate QR Code</button>

      <div id="imgbox">
        <img src="" id="qrImage" />
      </div>
    </div>

    <script>
      let imgbox = document.getElementById("imgbox");
      let qrImage = document.getElementById("qrImage");
      let qrtext = document.getElementById("qrtext");
      function generateqr() {
        qrImage.src=' https://api.qrserver.com/v1/create-qr-code/?size=150x150&data='+qrtext.value
      }
    </script>
  </body>
</html>