With Dropzone we can customize image file size, dropzone items to be clickable or not, width and height of the generated thumbnail, fallback input field for unsupported browsers. Loads of things to customize.
Download Dragzone.js from their website here.
<script src="./path/to/jquery/1.8/jquery.min.js"></script> <script src="./path/to/dropzone.js"></script>
Try to stick with the same class name and enter the appropriate id name.
<form action="/file-upload" class="dropzone" id="my-awesome-dropzone"></form>
Further instructions, kindly refer the developer’s website.