Jess

<p>Thumbnail Updater does exactly what it’s name implies: it updates thumbnails. WordPress 2.9 introduced support for<br />
post thumbnails but one problem is that the support is not backwards compatible—meaning that if you downloaded or created<br />
a theme that supports post thumbnails, any images uploaded prior to the activation of that theme will not have the new thumbnail size.</p>


Thumbnail Updater

A plugin for updating your thumbnails whenever a new thumbnail size is added with add_image_size()

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.

Thumbnail Updater vs Really Simple Featured Image: Automatic Featured Images