charliepatel

DraftPress Team

99robots

<p>Custom Image Sizes by 99 Robots is a quick and simple way for you to add your own image sizes to your WordPress site.</p>
<p>You can view this plugin on GitHub at: <a href="https://github.com/99robots/99robots-custom-image-sizes" rel="nofollow ugc">https://github.com/99robots/99robots-custom-image-sizes</a></p>
<p>Also, please <a href="https://draftpress.com/products/?utm_source=wprepo&utm_medium=custom-image-sizes&utm_campaign=desc" rel="nofollow ugc">check out our other plugins</a> 🙂</p>


Custom Image Sizes by 99 Robots


This seems like this is the best custom image size plugin freely available today.



The plugin does what one expects/needs it to do without any added complexity. The interface is then neither too basic/unstyled (like some other popular custom image size plugins) nor does it go over the top & make things more complex than it needs to be.



It's also nice to see this plugin is on GitHub where the most recent patch was actually community-provided & officially adopted in the new release (rather than being somewhat stagnant and/or over-relying on the plugin developer to come up with improvements/fixes/etc.) It's also good to see some activity regarding support and updates (again, unlike some other popular plugins for this.)


Worked exactly as expected with a nice interface

Custom Image Sizes by 99 Robots is a quick and simple way for you to add your own image sizes to your WordPress site.

YoOhw Studio

<p>Thumbnail Manager helps you control WordPress thumbnail generation, regenerate image sizes, and clean unused thumbnail files from the Media Library.</p>
<p>Use it after changing themes, installing WooCommerce, disabling custom image sizes, or cleaning up years of generated media files. The plugin focuses on predictable thumbnail management: choose which image sizes should stay enabled, rebuild the thumbnails you need, preview cleanup results, then delete only reviewed generated files.</p>
<p>Cleanup is metadata-aware and safety-focused. Thumbnail Manager validates uploads paths, protects original full-size images, runs prune/delete actions in batches, and updates attachment metadata after deleted thumbnail sizes are removed.</p>
<h4>Key Features</h4>
<ul>
<li>Regenerate WordPress thumbnails for existing image attachments</li>
<li>Generate only missing thumbnails or force-regenerate all selected images</li>
<li>Disable unwanted registered image sizes for future uploads</li>
<li>Prune unused thumbnails while keeping selected sizes</li>
<li>Run Dry-run previews before deleting generated thumbnail files</li>
<li>Detect legacy thumbnail sizes stored in attachment metadata</li>
<li>Report disk-only orphan matches without deleting unmapped files by default</li>
<li>Scan recommendations based on protected sizes, WooCommerce-related sizes, generated metadata, and common content references</li>
<li>Process large Media Libraries with cursor-based AJAX queues and folder scoping</li>
<li>Manage everything from Tools > Thumbnail Manager</li>
</ul>
<h4>Common Use Cases</h4>
<ul>
<li>Clean WordPress thumbnail bloat after theme or page builder changes</li>
<li>Regenerate thumbnails after changing Media Settings or custom image sizes</li>
<li>Reduce WooCommerce image storage by reviewing generated product thumbnails</li>
<li>Disable image sizes that should no longer be created for new uploads</li>
<li>Rebuild missing thumbnails after migration, restore, or failed image processing</li>
<li>Audit legacy thumbnail sizes left behind by old themes and plugins</li>
</ul>
<h4>Safety First</h4>
<p>Thumbnail Manager is designed for controlled cleanup, not blind filesystem deletion.</p>
<ul>
<li>Original full-size images are not deleted</li>
<li>Delete mode requires a fresh delete token and a completed scan</li>
<li>Dry-run mode never deletes files</li>
<li>Cleanup targets files from attachment metadata</li>
<li>Disk-only orphan matches are reported, not deleted by default</li>
<li>Paths are validated under the WordPress uploads directory before deletion</li>
<li>Attachment metadata is updated after generated thumbnail sizes are removed</li>
</ul>
<h4>What It Does Not Do</h4>
<ul>
<li>It does not compress or optimize image quality</li>
<li>It does not replace image optimization or CDN plugins</li>
<li>It does not automatically delete media without confirmation</li>
<li>It does not delete original uploaded images</li>
<li>It does not unregister image sizes from themes or plugins</li>
</ul>
<h3>Usage</h3>
<h4>Recommended Workflow</h4>
<ol>
<li>Open Tools > Thumbnail Manager.</li>
<li>Scan Recommendations to review likely keep/remove sizes.</li>
<li>Apply recommended sizes if they match your site.</li>
<li>Open Thumbnail Sizes and save the sizes you want generated for future uploads.</li>
<li>Run Regenerate to rebuild missing or selected thumbnails.</li>
<li>Open Prune Files and run Dry-run before any deletion.</li>
<li>Review matched files, then switch to Delete only when the preview is correct.</li>
</ol>
<h4>Regenerate Thumbnails</h4>
<p>Use Regenerate when you need to rebuild WordPress image sizes for existing attachments. You can process all media, the current year, a specific uploads folder, or specific attachment IDs.</p>
<h4>Prune Files</h4>
<p>Use Prune Files to clean generated thumbnails for sizes you no longer want to keep. Always run Dry-run first. If orphan discovery is enabled, metadata-backed legacy sizes can be included, while unmapped disk-only matches are reported for review.</p>
<h4>Thumbnail Sizes</h4>
<p>Use Thumbnail Sizes to control which registered image sizes WordPress should generate for future uploads. This setting does not remove existing files until you run Prune Files.</p>
<h3>Technical Notes</h3>
<ul>
<li>Uses <code>intermediate_image_sizes_advanced</code> to control future thumbnail generation</li>
<li>Uses cursor-based AJAX queues for regenerate and prune scans</li>
<li>Uses attachment metadata for prune candidates</li>
<li>Validates filesystem paths under the uploads directory before deletion</li>
<li>Updates attachment metadata after generated thumbnail files are removed</li>
<li>Requires the <code>manage_options</code> capability</li>
<li>Works per site on multisite installations</li>
</ul>
<h3>Privacy</h3>
<p>Thumbnail Manager does not collect, store, or transmit personal data. All thumbnail scans, regeneration actions, and cleanup actions run locally on your WordPress site.</p>


Thumbnail Manager

Regenerate WordPress thumbnails, disable image sizes, and safely clean unused media library thumbnails with dry-run previews.

Custom Image Sizes by 99 Robots vs Thumbnail Manager