Nico

<a href="http://nextgenthemes.com/plugins/regenerate-thumbnails-reminder/" rel="nofollow ugc">Plugin Page</a>
A small reminder in your admin area every time a image setting was changed (in media options, through a theme or plugin)
You most likely want to regenerate the thumbnails after this plugin reminds you to do so, if not already done I suggest you install the most used plugin Regenerate Thumbnails for this. This plugin will offer a redirection to <a href="https://wordpress.org/plugins/regenerate-thumbnails/" rel="ugc">Regenerate Thumbnails</a> in the admins reminder notice, but you can use any other plugin/method you prefer to regenerate thumbnails, just click dismiss when the reminder shows up and then manually navigate to your preferred regenerate plugin.

Regenerate Thumbnails Reminder

Checks if your image sizes have changed or if there was a new one added, if so it reminds you to go regenerate them.

Mehdi Rezaei

Thumbnail Remover and Size Manager 2.2 is a safer and more complete media-maintenance workflow for WordPress.
Instead of deleting thumbnails blindly, the plugin now helps you:
<ul>
<li>Preview cleanup results before removing files</li>
<li>Move thumbnails to plugin Trash instead of deleting permanently</li>
<li>Restore trashed thumbnails later if needed</li>
<li>Process large libraries in batches with visible progress</li>
<li>Detect orphan thumbnails left behind on disk</li>
<li>Detect probably unused media items across post content, featured images, and common builder data</li>
<li>Regenerate missing image sizes in batches</li>
<li>Review per-size analytics including file counts, storage usage, missing sizes, and orphan counts</li>
<li>Review recent activity logs and reporting summaries for cleanup, restore, backup, and regeneration workflows</li>
<li>Disable selected image sizes for future uploads</li>
<li>Create zip backups for all uploads or a specific year/month folder</li>
<li>Schedule recurring cleanup runs with configurable frequency, size scope, and folder scope</li>
</ul>
This release is built for site owners, developers, agencies, and anyone trying to reduce thumbnail bloat without risking accidental data loss.
<h3>Features</h3>
<ul>
<li>Dry run / preview before cleanup</li>
<li>Trash and Restore workflow for safer deletion</li>
<li>Batch processing with real progress for scan, cleanup, and regeneration</li>
<li>Unused media detection</li>
<li>Orphan thumbnail detection</li>
<li>Regenerate missing sizes</li>
<li>Per-size analytics dashboard</li>
<li>Reporting and recent activity logs</li>
<li>Advanced filters for image format, usage status, and orphan-only cleanup</li>
<li>Image size disable controls for future uploads</li>
<li>Media backup export to zip</li>
<li>Scheduled cleanup powered by WP-Cron</li>
</ul>

Thumbnail Remover and Size Manager

Safely analyze, preview, trash, restore, schedule, regenerate, report on, and manage WordPress thumbnails and image sizes.

Regenerate Thumbnails Reminder vs Thumbnail Remover and Size Manager