Jordy Meow

<p>When you insert images in WordPress, it’s always a specific image size. It can be an image size such as Medium, Large or something else set by your theme or another plugin. When you update your media sizes settings (or switch theme), you need to regenerate those images (with Regenerate Thumbnails, for example). But what about your posts content? They will be still using the old images, which aren’t actually part of the new metadata, and little by little your WordPress will become more and more broken. This plugin fixes this by regenerating the HTML for your thumbnails / images in your content and keeps everything clean. Once this is done, it’s a good idea to run a tool like Media Cleaner (https://wordpress.org/plugins/media-cleaner/) on your install to detect the useless files.</p>
<p><strong><em>Be careful!</em></strong>. Before using this plugin, backup your database! It doesn’t modify your files, only database.</p>


Regenerate Thumbnails HTML

Works well on my two plugins after switching to a new theme. Regenerate Thumbnails (after set up the new sizes) + Regenerate Thumbnails HTML (on all posts, for 2 or 3 sizes) + Media Cleaner (to delete the useless files). In one hour, the new installs are neat and clean.

It works well

Thank you!
After change WP media sizes for new theme we must use regenerate thumbnail plug-in. But I want apply new sizes in old post! After that I can clear old images!

Good work with "view-broken-links" plug-in.

Gold in ocean of wp problems

Update the HTML of the images contained in the post from one image size to another. Useful when switching between sizes and themes.

Adi Glibanović

<p>The Selective Thumbnail Regenerator plugin provides a powerful and user-friendly way to regenerate image thumbnails for WordPress media libraries. Unlike other thumbnail regeneration plugins that blindly process the entire library, this plugin gives you precise control: choose a specific year, month, and even a title keyword to target exactly the images you need.</p>
<h4>Key Features</h4>
<ul>
<li><strong>Date & Title Filters</strong> – Choose a specific year, month, or search by title to target only the images you need.</li>
<li><strong>Month Status Calendar</strong> – A visual 4×3 calendar grid appears when you select a year. Months that have been regenerated are highlighted in green with a checkmark. Clicking a month badge automatically selects it.</li>
<li><strong>Regeneration History Tracking</strong> – Completed months are stored in the database and persist across sessions. A “Reset History” button clears all records when needed.</li>
<li><strong>Thumbnail Size Selection</strong> – Choose specific registered thumbnail sizes to regenerate instead of all sizes.</li>
<li><strong>Configurable Batch Size</strong> – Set how many images are processed per AJAX request (1-20).</li>
<li><strong>Throttle Delay Control</strong> – Set a cooldown pause between batches (0-2000 ms) to reduce server load.</li>
<li><strong>Dry Run Mode</strong> – Preview which images would be processed without writing any changes to disk.</li>
<li><strong>Automatic Batch Failure Recovery</strong> – If a batch crashes, the plugin retries each image individually, isolates the bad one, logs it, and continues with the rest.</li>
<li><strong>Failed Images Log</strong> – Detailed table of all failed images including ID, title, and exact failure reason.</li>
<li><strong>Orphaned File Cleanup</strong> – Old thumbnail files are deleted from disk before new ones are generated.</li>
<li><strong>Live Terminal Activity Log</strong> – Real-time monospace console with timestamped status messages.</li>
<li><strong>Visual Completion Metrics</strong> – Five-card summary board: Processed, Successful, Failed, Skipped, Duration.</li>
<li><strong>Cancel Support</strong> – Stop the regeneration at any time with a graceful shutdown.</li>
<li><strong>Performance Optimized</strong> – Direct indexed SQL query for year selector loading.</li>
</ul>
<h3>Usage</h3>
<ol>
<li>Navigate to Tools > Selective Thumbnail Regenerator.</li>
<li>Select a year from the dropdown. A Month Status Calendar will appear showing which months have already been regenerated.</li>
<li>Optionally select a month – via the dropdown or by clicking a month badge on the calendar.</li>
<li>Optionally enter a title keyword to filter images by name.</li>
<li>Adjust batch size and throttle delay in the Performance Configuration card.</li>
<li>Enable Dry Run Mode to preview results without making changes.</li>
<li>Click “Scan Matching Images” to count how many images match your filters.</li>
<li>Click “Start Regeneration” to begin. Watch the live terminal log for real-time updates.</li>
<li>Review the Job Completion Report and Failed Images Log after the process ends.</li>
</ol>
<h3>Troubleshooting</h3>
<h4>“No images found for the selected period”</h4>
<p>There are no image attachments uploaded during the selected year/month. Try a different time period.</p>
<h4>The process is slow</h4>
<p>Reduce the throttle delay or increase the batch size if your server can handle more load. Alternatively, increase the delay and reduce batch size if you are getting timeouts.</p>
<h4>A batch keeps failing</h4>
<p>Enable Dry Run Mode first to verify image accessibility. If specific images crash the server, they will appear in the Failed Images Log after regeneration completes.</p>


Selective Thumbnail Regenerator

Regenerate thumbnails selectively by upload date and search filters with full history calendar, performance throttle, and fail-safe recovery.

Regenerate Thumbnails HTML vs Selective Thumbnail Regenerator