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Check file size before uploading

By using the uploading event, you can get the file size before uploading it to the server. File object contains the file size in bytes only. You can convert the size to standard formats (KB or MB) using bytesToSize method.

Source
Preview
app.ts
index.html
index.css
import { Uploader } from '@syncfusion/ej2-inputs';

//Initialize the control by preload files
let uploadObj: Uploader = new Uploader({
    autoUpload: false,
    asyncSettings: {
        saveUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Save',
        removeUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Remove'
    },
    uploading: onBeforeUpload
});
uploadObj.appendTo('#fileupload');

function onBeforeUpload(args): void {
    // get the file size in bytes
    let sizeInBytes: number = args.fileData.size;
    // get the file size in standard format
    alert("File size is: " + uploadObj.bytesToSize(sizeInBytes));
}
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 Uploader</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 Uploader Component" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
        <div id='container'>
            <input type="file" id="fileupload" name="UploadFiles"/>
        </div>
    </div>
</body>
</html>
#container {
  visibility: hidden;
}

#loader {
  color: #008cff;
  font-family: 'Helvetica Neue','calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}