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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
      <input id="upload" name="upload" type="file"><br>
      <button id="size">Size</button><br>
      <span id="console"></span>  
  
<script type="text/javascript">
    document.getElementById('size').onclick = function() {
        let size = document.getElementById('upload').files.item(0).size;
        document.getElementById('console').innerHTML = 'Size: ' + size;
    };
</script>  
  
</body>
</html>
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JustinSDKpro
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