Dropzone.js can be used with or without jQuery in your project, and it does not have any additional library requirements. This library does not handle file uploads to your server directly. In this tutorial, PHP will be used for uploading.
File upload can be done by either dragging and dropping or by using the file chooser dialog that opens when the drag n’ drop widget is clicked. While uploading, Dropzone.js displays a progress bar, generates a thumbnail image, and provides file size preview after uploading.