<h3>Get File Size from input type=file with jQuery</h3>
<input type="file" id="myfile"> 
<p id="size_view"></p>
$(function(){
  $('#myfile').on('change',function(){
    console.log($(this)[0].files[0]);
    $('#size_view').html('File Size: '+$(this)[0].files[0].size.toLocaleString()+' bytes');
  });
});

External CSS

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External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.0/jquery.min.js