Alex Mills

<p>Regenerate Thumbnails allows you to regenerate all thumbnail sizes for one or more images that have been uploaded to your Media Library.</p>
<p>This is useful for situations such as:</p>
<ul>
<li>A new thumbnail size has been added and you want past uploads to have a thumbnail in that size.</li>
<li>You’ve changed the dimensions of an existing thumbnail size, for example via Settings â Media.</li>
<li>You’ve switched to a new WordPress theme that uses featured images of a different size.</li>
</ul>
<p>It also offers the ability to delete old, unused thumbnails in order to free up server space.</p>
<h4>In Memory of Alex Mills</h4>
<p>In February 2019 Alex Mills, the author of this plugin, <a href="https://alex.blog/2019/02/27/from-alexs-family/" rel="nofollow ugc">passed away</a>. He leaves behind a number of plugins which will be maintained by Automattic and members of the WordPress community. If this plugin is useful to you please consider donating to the Oregon Health and Science University. You can find more information <a href="https://alex.blog/2019/03/13/in-memory-of-alex-donation-link-update/" rel="nofollow ugc">here</a>.</p>
<h4>Alternatives</h4>
<p><strong>WP-CLI</strong></p>
<p>If you have command line access to your server, I highly recommend using <a href="https://wp-cli.org/" rel="nofollow ugc">WP-CLI</a> instead of this plugin as it’s faster (no HTTP requests overhead) and can be run inside of a <code>screen</code> for those with many thumbnails. For details, see the documentation of its <a href="https://developer.wordpress.org/cli/commands/media/regenerate/" rel="nofollow ugc"><code>media regenerate</code> command</a>.</p>
<p><strong>Jetpack’s Photon Module</strong></p>
<p><a href="https://jetpack.com/" rel="nofollow ugc">Jetpack</a> is a plugin by Automattic, makers of WordPress.com. It gives your self-hosted WordPress site some of the functionality that is available to WordPress.com-hosted sites.</p>
<p><a href="https://jetpack.com/support/photon/" rel="nofollow ugc">The Photon module</a> makes the images on your site be served from WordPress.com’s global content delivery network (CDN) which should speed up the loading of images. Importantly though it can create thumbnails on the fly which means you’ll never need to use this plugin.</p>
<p>I personally use Photon on my own website.</p>
<p><em>Disclaimer: I work for Automattic but I would recommend Photon even if I didn’t.</em></p>
<h4>Need Help? Found A Bug? Want To Contribute Code?</h4>
<p>Support for this plugin is provided via the <a href="https://wordpress.org/support/plugin/regenerate-thumbnails" rel="ugc">WordPress.org forums</a>.</p>
<p>The source code for this plugin is available on <a href="https://github.com/automattic/regenerate-thumbnails" rel="nofollow ugc">GitHub</a>.</p>


Regenerate Thumbnails

I'm a longtime WP dev and if you need to regenerate thumbnails its the way to go.

I appreciate the fact its free, this is what makes WP great

5 Stars


I can't even remember for how long I've been using this plugin from time to time... Miss you Alex... I'm sure you're smiling from up above 3> 


Thanks, Alex...

Regenerate the thumbnails for one or more of your image uploads. Useful when changing their sizes or your theme.

Krishna Kant Chourasiya

JetixWP Plugins

<p>Really Simple Featured Image keeps your posts and pages visually consistent by filling in missing featured images automatically. When you update or publish posts, pages, and CPTs, the plugin inspects the editor content and assigns the first available image or streaming video thumbnail as the featured image – no extra clicks required.</p>
<h4>Key Features</h4>
<ul>
<li>Automatically sets the featured image when one is not provided.</li>
<li>Detects inline images from blocks, classic editor markup, builders, and srcset/background sources.</li>
<li>Fetches thumbnails from YouTube, Vimeo, and Dailymotion embeds when you prefer video covers.</li>
<li>Lets you enable or disable automation per post type that supports featured images.</li>
<li>Respects existing featured images and runs quietly in the background.</li>
</ul>
<h4>How It Works</h4>
<ol>
<li>Choose the default source (images in content or video thumbnails) from JetixWP -> Auto Featured Image.</li>
<li>Select which post types should receive automatic featured images.</li>
<li>Save or update a post – if it has no featured image, the plugin will attach the first match it finds.</li>
</ol>
<h4>Requirements</h4>
<ul>
<li>WordPress 6.0 or newer.</li>
<li>PHP 8.0 or newer.</li>
</ul>
<h3>External Services</h3>
<p>This plugin connects to third-party video platform APIs to retrieve video thumbnails when you choose “Video in Post Content” as your default source. These connections only occur when a post is saved or updated and contains an embedded video from one of the supported platforms.</p>
<h4>YouTube</h4>
<p>When a YouTube video is detected in your post content, the plugin sends the video ID to YouTube’s oEmbed API to retrieve the video title and thumbnail URL.</p>
<ul>
<li>Data sent: YouTube video ID.</li>
<li>When: On post save/update if the post has no featured image and contains a YouTube embed.</li>
<li>Service provider: Google LLC.</li>
<li><a href="https://www.youtube.com/t/terms" rel="nofollow ugc">Terms of Service</a> & <a href="https://policies.google.com/privacy" rel="nofollow ugc">Privacy Policy</a></li>
</ul>
<h4>Vimeo</h4>
<p>When a Vimeo video is detected in your post content, the plugin sends the video ID to Vimeo’s API to retrieve the video title and thumbnail URL.</p>
<ul>
<li>Data sent: Vimeo video ID.</li>
<li>When: On post save/update if the post has no featured image and contains a Vimeo embed.</li>
<li>Service provider: Vimeo, Inc.</li>
<li><a href="https://vimeo.com/terms" rel="nofollow ugc">Terms of Service</a> & <a href="https://vimeo.com/privacy" rel="nofollow ugc">Privacy Policy</a></li>
</ul>
<h4>Dailymotion</h4>
<p>When a Dailymotion video is detected in your post content, the plugin sends the video ID to Dailymotion’s API to retrieve the video title and thumbnail URL.</p>
<ul>
<li>Data sent: Dailymotion video ID.</li>
<li>When: On post save/update if the post has no featured image and contains a Dailymotion embed.</li>
<li>Service provider: Dailymotion SA.</li>
<li><a href="https://www.dailymotion.com/legal" rel="nofollow ugc">Terms of Service</a> & <a href="https://www.dailymotion.com/legal/privacy" rel="nofollow ugc">Privacy Policy</a></li>
</ul>


Really Simple Featured Image: Automatic Featured Images

Automatically generate missing featured images from video or image inside content for Posts, Pages and CPTs.

Regenerate Thumbnails vs Really Simple Featured Image: Automatic Featured Images