Konrád Koller

<p><strong>This plugin helps you to fix any missing thumbnail issue in a fairly short time</strong>. The only thing you need to do is just few simple click and the plugin does the rest. It can be really helpful if you have thousands of images in your database.</p>
<p>You can regenerate thumbnails for each single image in your database or you can simply select those you really want to update. If you choose a post or page the plugin will regenerate thumbnails for each related images. You can choose from the following methods:</p>
<ul>
<li>Regenerate thumbnails for all images in the database.</li>
<li>Bulk action in post liste: You can choose which one to update by checking the checkboxes.</li>
<li>Media library items: Move your mouse over the chosen image(s) and click on “Regenerate thumbnails” link.</li>
<li>Post editor: click on “Regenerate thumbnails” button which is next to “Add media” button. (Off by default)</li>
</ul>
<p>Furthermore you can add your own thumbnails sizes, change default JPG compression rate and mass regenerate thumbnails. The best thing about this plugin is that <strong>you can use it with custom post types</strong> as well.</p>


ONet Regenerate Thumbnails

Doesnt have 4.4.1 bulk generation support. But you can generate thumbnails one by one.



Doesnt have 4.4.1 support completely

Fix missing thumbnails in no time with few easy clicks. The plugin does the hard work.

YoOhw Studio

<p>Thumbnail Manager is a powerful tool to take full control over your WordPress image system.</p>
<p>Instead of letting themes and plugins generate dozens of unnecessary thumbnails, you can now:</p>
<ul>
<li><strong>Control which sizes are created</strong></li>
<li><strong>Remove unused thumbnails safely</strong></li>
<li><strong>Regenerate only what you actually need</strong></li>
</ul>
<p>All in one place.</p>
<h3>🚀 What it does</h3>
<p><strong>1. Regenerate Thumbnails (NEW)</strong><br />
– Regenerate thumbnails based on your current enabled sizes<br />
– Works in batches with progress tracking (no timeout issues)<br />
– Perfect after disabling unwanted sizes<br />
– Ensures your Media Library stays consistent and optimized</p>
<p><strong>2. Prune Unused Thumbnails</strong><br />
– Select sizes you want to <strong>KEEP</strong><br />
– Automatically detect and remove all other generated thumbnails<br />
– Supports:<br />
  – Registered sizes<br />
  – Orphan <code>-WxH</code> files<br />
  – <code>.webp</code>, <code>.bak</code>, <code>@2x</code>, <code>-1</code> variants</p>
<p><strong>3. Orphan File Discovery</strong><br />
– Detect leftover thumbnails no longer registered<br />
– Clean legacy sizes from old themes/plugins<br />
– Optional aggressive cleanup mode</p>
<p><strong>4. Disable Sizes for Future Uploads</strong><br />
– Prevent unnecessary thumbnails from being generated<br />
– Reduce storage usage going forward<br />
– Keeps your system lean and predictable</p>
<p><strong>5. Scoped Processing</strong><br />
– Limit operations to specific folders (year/month)<br />
– Safer testing on large Media Libraries</p>
<h3>❌ What it does NOT do</h3>
<ul>
<li>It <strong>does NOT delete original full-size images</strong></li>
<li>It <strong>does NOT modify image quality or compression</strong></li>
<li>It <strong>does NOT replace image optimization plugins</strong></li>
<li>It does not automatically run actions without your confirmation</li>
</ul>
<h3>🎯 Who is it for?</h3>
<ul>
<li>WooCommerce stores with heavy image usage</li>
<li>Sites using multiple themes/page builders</li>
<li>Developers cleaning legacy media bloat</li>
<li>Anyone hitting disk limits or slow backups</li>
</ul>
<h3>Features</h3>
<ul>
<li>3-tab UI: <strong>Regenerate</strong>, <strong>Prune Files</strong>, <strong>Thumbnail Sizes</strong></li>
<li>Batch processing with AJAX (no timeouts)</li>
<li>Dry-run preview before deletion</li>
<li>Smart orphan detection</li>
<li>Progress bars + live feedback</li>
<li>Future upload size control</li>
<li>Multisite compatible (run per site)</li>
</ul>
<h3>Usage</h3>
<h3>Regenerate (Recommended flow)</h3>
<ol>
<li>Go to <strong>Thumbnail Sizes</strong></li>
<li>Disable unwanted sizes</li>
<li>Click <strong>Save changes and run regenerate</strong></li>
<li>Let the system rebuild only the sizes you want</li>
</ol>
<h3>Prune Files</h3>
<ol>
<li>Select sizes to <strong>KEEP</strong></li>
<li>Run <strong>Dry-run</strong> first</li>
<li>Review results</li>
<li>Switch to <strong>Delete</strong> and execute</li>
</ol>
<h3>Thumbnail Sizes</h3>
<ul>
<li>Enable/disable sizes for future uploads</li>
<li>Does NOT affect existing images until prune/regenerate is used</li>
</ul>
<h3>Technical Notes</h3>
<ul>
<li>Uses <code>intermediate_image_sizes_advanced</code> to control generation</li>
<li>Uses AJAX batching to avoid server timeout</li>
<li>Safe file targeting via pattern matching</li>
<li>Requires <code>manage_options</code> capability</li>
</ul>
<h3>Privacy</h3>
<p>This plugin does not collect or transmit any personal data.<br />
All operations are performed locally on your server.</p>


Thumbnail Manager

Clean, control, and regenerate thumbnails with precision — remove unused sizes, prevent bloat, and rebuild what matters.

ONet Regenerate Thumbnails vs Thumbnail Manager