Sean Butze

Many users do not compress or resize their images before uploading them into a post, and oftentimes WordPress’s maximum upload limit of 2MB-10MB is still too large to prevent the insertion of photos that can signficantly slow down a website.
WP Image Size Limit allows an administrator to set a custom file size limit that is specific to image files and smaller than WordPress’s general file size limit.
This is especially useful when you need to put tighter restriction on image uploads but want to preserve the ability to upload larger files of other formats (audio, video, etc.).

WP Image Size Limit

Just what I needed to tamp down those designers who think it's okay to use 20MB images!

Brilliant

Adds a new setting under Settings -> Media where an admin can set a maximum upload file size for image files.

Butiá Labs

Refaxination scans <code>wp-content/uploads</code> and cross-references every file against the database. 
Attachments, post content, post meta, options, and third-party plugins, to identify files that are no longer referenced anywhere.
Features:
<ul>
<li>Full filesystem scan of wp-content/uploads</li>
<li>Database reference detection across:
<ul>
<li>WordPress attachments and post content</li>
<li>Post meta fields</li>
<li>WordPress options</li>
<li>ACF (Advanced Custom Fields)</li>
<li>Yoast SEO</li>
<li>The SEO Framework</li>
</ul>
</li>
<li>Safe quarantine/move operations with full audit log</li>
<li>Admin dashboard with file and operation history</li>
<li>All heavy operations run via WP-CLI to avoid timeouts</li>
</ul>
This plugin does not auto-delete anything. Every file operation is logged and reversible.
<h3>WP-CLI Commands</h3>
Scan the filesystem for files:
<pre><code>wp refaxination scan files
</code></pre>
Scan the database for references:
<pre><code>wp refaxination scan refs
</code></pre>
Generate a report:
<pre><code>wp refaxination report
</code></pre>
Run with <code>--batch=100</code> to process in batches (recommended for large sites):
<pre><code>wp refaxination scan files --batch=100
</code></pre>

Refaxination

Audits and manages orphaned files in the Uploads folder. All operations via WP-CLI.

WP Image Size Limit vs Refaxination