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Media File Limiter is a lightweight and efficient plugin designed to strengthen your WordPress upload security.
It limits the maximum upload file size (in MB) and blocks specific dangerous file extensions (e.g., .exe, .php, .html, .js), preventing malicious or oversized files from being uploaded to your media library.
Unlike traditional file validation, this plugin operates at the earliest possible stage of the upload process via the wp_handle_upload_prefilter hook, ensuring that dangerous files are blocked before WordPress processes them.
Key Features 
Set a custom maximum upload size (in MB).
Define forbidden file extensions (comma-separated).
Displays current PHP/WordPress upload limits for reference.
Early-stage security enforcement — before files reach media processing.
Fully translatable and internationalized (media-file-limiter text domain).
Compatible with multisite environments.
Why This Plugin? 
WordPress allows large files and executable extensions under certain misconfigurations, which can lead to:
Server performance degradation.
Potential remote code execution (RCE) risks.
Media library clutter and upload errors.
Media File Limiter addresses these issues with a simple, configurable interface under the WordPress “Settings → Media Limit” page.
<h3>License</h3>
This plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or any later version.
This plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
<h3>Additional Notes</h3>
The plugin follows WordPress Coding Standards (WPCS).
All options use the Settings API (register_setting / add_settings_field).
Security first: early execution priority (wp_handle_upload_prefilter, priority 1).
Uninstall hook (register_uninstall_hook) ensures full cleanup.

Media File Limiter

Restrict maximum upload file size and block dangerous extensions at upload time. Ensures early-stage validation for enhanced WordPress media security.

This plugin provides an additional sortable column in the wp-admin Posts screen that allows you to sort the posts by total size of all attachments. If your post has 10 images attached, the number shown will be the total file size of all 10 images added together. This is useful for WordPress websites with a lot of photo galleries.
<h3>Usage</h3>
<ol>
<li>Simply install the plugin and activate using the directions above. The sortable wp-admin column will be added automatically.</li>
<li>You can also use the shortcode provided to return the file sizes. Usage is as follows:
<ul>
<li><code>[pas_display_post_size post_id=false single=false return="both"]</code>
<ul>
<li><code>post_id</code> = The post ID (if <code>single = true</code> then use the attachment ID) [OPTIONAL]</li>
<li><code>single</code> = Set to <code>true</code> if you only want the size of ONE attachment (MUST set the <code>post_id</code> to the attachment ID if this is true)</li>
<li><code>return</code> = Default <code>both</code>: returns both the raw byte size of the file AND the formatted value.
<ul>
<li>Use <code>byte</code> to return JUST the byte value.</li>
<li>Use <code>formatted</code> to return JUST the formatted file size</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ol>

Post Attachment Sizes

Post Attachment Size calculates the total size of all attachments attached to a post and provides a sortable column in the wp-admin post list based on …

Media File Limiter vs Post Attachment Sizes