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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.

Denis B

Max Upload Size Changer is a simple yet powerful plugin that allows WordPress administrators to adjust the maximum upload size directly from the dashboard. This can be particularly useful when you need to upload larger files but are restricted by the default WordPress upload limit. 
q 
Key features: 
* Easy to use interface in the WordPress dashboard 
* Displays current maximum upload size 
* Provides a warning if server limits prevent the desired upload size from being set
<h3>Usage</h3>
<ol>
<li>Go to Settings -> Max Upload Size in your WordPress dashboard</li>
<li>Enter your desired maximum upload size in megabytes</li>
<li>Click ‘Save Changes’</li>
</ol>
Note: The actual upload size may be limited by your server configuration. If you’re unable to increase the size as desired, you may need to contact your hosting provider.
<h3>License</h3>
This plugin is licensed under the GPL v2 or later.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License, version 2, as published by the Free Software Foundation.
This program 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. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
A copy of the license is included with the plugin, and is also available at http://www.gnu.org/licenses/gpl-2.0.html.

Max Upload Size Changer

Works Perfectly

Allows users to change the maximum upload size from the WordPress dashboard.

Media File Limiter vs Max Upload Size Changer