Benjamin Bode

WordPress automatically creates multiple copies of every image you upload in different sizes (thumbnail, medium, large, and more). Over time, this wastes a significant amount of disk space, especially on large sites with thousands of images.
Imadero scans your media library, finds all auto-generated thumbnails, and removes them safely. It also updates all references in your posts, pages, and metadata to use the original image instead.
<h4>Features</h4>
<ul>
<li>Scan your media library to find all auto-generated thumbnails</li>
<li>Preview how many files and how much disk space can be freed before deleting anything</li>
<li>Delete all thumbnails in batches (safe for large sites)</li>
<li>Rewrite all database references (posts, meta, options) to use the original image</li>
<li>Prevent WordPress from generating thumbnails on future uploads</li>
<li>Handles serialized data safely (works with Elementor, Divi, WPBakery, and other page builders)</li>
<li>Handles Gutenberg block attributes (sizeSlug, CSS classes)</li>
<li>Removes WordPress -scaled images and restores the original</li>
<li>Batch processing prevents timeouts on large installations</li>
<li>Works with WooCommerce product images</li>
</ul>
<h4>How It Works</h4>
<ol>
<li>Go to Tools > Imadero in your WordPress admin</li>
<li>Click Start Scan to find all auto-generated thumbnails</li>
<li>Review the results: number of thumbnails and disk space used</li>
<li>Click Delete Thumbnails to remove them and update database references</li>
<li>Optionally enable Disable automatic thumbnail generation to prevent future thumbnails</li>
</ol>
<h4>Important Notes</h4>
<ul>
<li>Always create a backup before running the cleanup</li>
<li>The deletion process cannot be undone</li>
<li>WordPress will automatically fall back to the original image where thumbnails were used</li>
<li>The plugin works per site on Multisite installations</li>
</ul>

Imadero

Remove auto-generated image thumbnails to free up disk space and keep your media library clean.

voceplatforms

Chris Scott

Adds multiple post thumbnails to a post type. If you’ve ever wanted more than one Featured Image on a post, this plugin is for you.

Multiple Post Thumbnails

Even though this plugin hasn't been updated in a long time, it still works great! So I guess there's just no reason for the developer to have it updated. ;-)
For me this plugin is one of the easiest ways to selectively add a header image. I want it on some pages, but not on others. Using the standard Featured Image function will set it foor all or none, so that's not flexible enough.
One suggestion for an update though:
Now you still need to add the following snippet to your theme's function.php.
if (class_exists('MultiPostThumbnails')) {
    new MultiPostThumbnails(
        array(
            'label' => 'Secondary Image',
            'id' => 'secondary-image',
            'post_type' => 'post'
            'post_type' => 'page'
        )
    );
}
It would be great if the plugin did this automatically. That will also keep the plugin active if you switch themes. 
P.S.
To add the meta box to other post types, just add it to the snippet.
'post_type' => 'event' will add it for Events Manager, for example. ;-)



Still works great!

Adds multiple post thumbnails to a post type. If you've ever wanted more than one Featured Image on a post, this plugin is for you.

Imadero vs Multiple Post Thumbnails