index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <div class="container"><p>Enter your Text/LINK</p>

        <input type="text" placeholder="Text/LINK" id="qrText"></input>
        <div id="imgBox">
            <img src=""  id="qrImage">
        </div>
        <button onclick="GenerateQr()">Generate QR </button>
</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;
        imgBox.classList.add("show-img")
        }
</script>

   
  </body>
</html>