One Crayon

Markup to Featured Image will automatically generate a featured image when you publish a post, with the intent of allowing you to publish posts with featured images from third-party clients like MarsEdit.
To add a featured image to your post, include one of the following markup variants in your post’s content:
<pre><code><img src="/path/to/image.jpg" data-featured-image="keep" />
<img src="/path/to/image.jpg" data-featured-image="strip" />

</code></pre>
If you use an <code><img></code> element, the values of the <code>data-featured-image</code> attribute specify whether the image should be displayed when the post is shown on your site (<code>keep</code>) or ignored when the post is displayed (<code>strip</code>). The order of attributes in your <code><img></code> tag (and whether you include other attributes, like width/height, title, alt, etc.) doesn’t matter. You can make it as complicated or simple as you like.
If the post already has a featured image, the plugin will do nothing (version 1.0 does not allow updating the thumbnail by updating the markup).

Markup to Featured Image

Automatically set the featured image (formerly the post thumbnail) for a post based on custom markup in the body text.

Ebenezer Obasi

A simple WordPress plugin to list posts without a featured image in the admin posts page.
Description
Your time-saving tool for finding post with no featured image. This is perfect if you just migrated your blog to WordPress and need to see if all your post has a featured image.
The plugin works for the ‘post’ post type only with plans to extend it to other post types in future updates.
<h3>ACCESS</h3>
<ul>
<li>You will find the plugin in the WP Admin > Post sub-menus. Click on the ‘No Thumbnail’ link to list your posts with no featured image.</li>
<li>Edit a post to add a featured image.</li>
</ul>
License
<ul>
<li>
This software is intended for use with WordPress Software https://www.wordpress.org/ and is a proprietary licensed product.
</li>
<li></li>
<li>Copyright (c) 2020, Ebenezer Obasi</li>
<li>All rights reserved.</li>
<li>
info@eobasi.com.
</li>
<li>
Redistribution and use in source and binary forms, with or without modification, are not permitted provided.
</li>
<li>
This plugin should be bought from the developer. For details contact info@eobasi.com.
</li>
<li>
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES,
</li>
<li>INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR</li>
<li>PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,</li>
<li>INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,</li>
<li>PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED</li>
<li>AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</li>
<li>ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</li>
</ul>

WordPress San-Thumbnail Posts Plugin

A simple Wordpress plugin to list posts without a featured image in the admin posts page. Description Your time-saving tool for finding post with no …

Markup to Featured Image vs WordPress San-Thumbnail Posts Plugin