Hide "Upload" Button of a Document Library in SharePoint 2013

Requirement: Disable upload button in SharePoint document library!

But why? Because, we wanted users to fill the form by creating new document from the New drop-down and not to upload any existing documents with Upload button. So we need to hide upload button in SharePoint 2013.

Solution: CSS! Place this CSS either in Master page or script editor/content editor of the target page.

CSS Styles to hide Upload button in SharePoint 2013:

<style type="text/css">
#Ribbon\.Documents\.New\.AddDocument-Large, #Ribbon\.Documents\.New-MediumMedium-0-1
{    
               display:none !important;
}
</style>

Hide "Open with Explorer" button in SharePoint 2013 ribbon:
You may also want to disable "Open in Explorer" as it allows multiple file upload. Use this CSS to hide "Open in Explorer" from SharePoint 2013 ribbon.

#Ribbon\.Library\.Actions-LargeMedium-1-1

Result: Upload button disabled in SharePoint 2013 document library!
Disable Drag and Drop feature of SharePoint 2013:
How about disabling Drag-Drop feature? Well, use this script to disable Drag and Drop feature of SharePoint 2013 document libraries:

<script type="text/javascript">
  ExecuteOrDelayUntilScriptLoaded(function() {
   g_uploadType = DragDropMode.NOTSUPPORTED;
   SPDragDropManager.DragDropMode = DragDropMode.NOTSUPPORTED;
}, "DragDrop.js");

How to Disable Upload Button and Drag and Drop Feature in SharePoint 2016:
Edit and Add a script editor on the target list view page (AllItems.aspx), place this code in it.

<style type="text/css">
#Ribbon\.Documents\.New\.AddDocument-Large, #Ribbon\.Documents\.New-MediumMedium-0-1, #Ribbon\.Library\.Actions-LargeMedium-1-1
{    
               display:none !important;
}

/* Hide "Drag files here to upload" message in the List view */
div.ms-dragDropAttract-subtle{
 display: none 
}
/* Upload button in Doc Lib tool bar */
#QCB1_Button2
{
 display:none !important; 
} 

</style>

//Disable Drag and Drop Upload Feature
<script type="text/javascript">
  ExecuteOrDelayUntilScriptLoaded(function() {
   g_uploadType = DragDropMode.NOTSUPPORTED;
   SPDragDropManager.DragDropMode = DragDropMode.NOTSUPPORTED;
}, "DragDrop.js");