Theme Egg

<p>Generate Thumbnail allows you to generate all thumbnails on your site. There are already some plugins available for this, but they have one thing in common: All thumbnails are regenerate in a single step. This works fine when you don’t have that many photos on your site. When you have a lot of full-size photos, the script on the server side takes a long time to run. Unfortunately the time a script is allowed to run is limited, which sets an upper limit to the number of thumbnails you can regenerate. This number depends on the server configuration and the computing power your server has available. When you get over this limit, you won’t be able to generate your thumbnails.</p>
<p>Why would you want to generate your thumbnails? WordPress allows you to change the size of thumbnails. This way, you can make the size of thumbnails fit the design of your website. When you change the size to fit for a new theme, all future photos you are going to upload will have this new size. Your old thumbnails won’t be resized. That’s where this plugin comes into action. After changing the image sizes, you can generate all thumbnails. But instead of telling the server to recreate all thumbnails at once, they are generate one after another. Generateing thumbnails for one photo won’t take all too long, so you won’t run into any script timeouts. Note that you still have to wait until all thumbnails have been rebuilt. If you close the page before the task is completed, you have to start all over again.</p>
<p>You can also select the thumbnail sizes you want to generate, so that you don’t need to recreate all images if you’ve just changed one thumbnail-size. You can also choose to only generate post thumbnails (featured images).</p>
<p>This plugin requires JavaScript to be enabled.</p>


Generate Thumbnail

Generate Thumbnail allows you to generate all thumbnails at once without script timeouts on your server.

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.

Generate Thumbnail vs Selective Thumbnail Regenerator