Rafik

Dilip Modhavadiya

This plugin adds a wp-admin screen under Media where you can:
<ul>
<li>Upload files (supports chunked upload via Plupload)</li>
<li>Browse uploaded files in a directory tree</li>
<li>Import images (JPG, PNG, GIF, WebP) and PDF files from this directory into the Media Library</li>
</ul>
Note: Upload size ultimately depends on server limits (PHP upload_max_filesize, post_max_size, timeouts, etc.). Chunking can help with stability but cannot bypass hard limits on your hosting.

MediaNest Upload Manager

Upload files into a dedicated uploads subfolder, browse from wp-admin, and import into the Media Library.

Jason LeMahieu (MadtownLems)

University of Wisconsin - Cooperative Extension

This plugin adds a column to the Media Library page that displays the total space used by each media item. For images, this includes the original image as well as any other generated sizes.
This plugin is particularly handy for networks where site owners have a limited space quota.
Additionally, sorting your Media Library by file size is actually a great way to identify duplicate media items.

Media File Sizes

I REALLY needed this, to be able to identify the largest images, and I'm glad to see it still works in April of 2018

Still Works

Easily see how much disk space (in KB, MB, & a percentage of your quota) each of your uploaded files takes up.

MediaNest Upload Manager vs Media File Sizes