ulfben

This plugin adds an “Use as Featured Image”-action to the Media Library. Very useful if you need to set the post thumbnail / featured image for a lot of posts.
<a href="https://wordpress.org/extend/plugins/bulk-select-featured-image/screenshots/" rel="ugc">A picture says more than a thousand words</a>.
//<a href="https://www.ulfbenjaminsson.com/" rel="nofollow ugc">Ulf Benjaminsson</a> 
Copyright (C) 2012 Ulf Benjaminsson (hello at my full name dot com).
This program is free software; you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published by 
the Free Software Foundation; either version 2 of the License, or 
(at your option) any later version.
This program is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
GNU General Public License for more details.
You should have received a copy of the GNU General Public License 
along with this program; if not, write to the Free Software 
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Bulk-Select Featured Image

Allows you to select Featured Image / post thumbnail for your posts directly from the media library view.

Bjorn Solstad

Clickable Featured Image fixes a common WordPress problem: featured images often look clickable, but nothing happens when visitors click them.
Activate the plugin and featured images become useful links:
<ul>
<li>On single posts and pages, featured images link to the full-size image file by default, which works well with common lightbox plugins.</li>
<li>On archive pages, category pages, search results, and Query Loop blocks, featured images link to the post by default.</li>
<li>If a theme or block already links the featured image, the plugin leaves it alone to avoid duplicate links.</li>
</ul>
The default setup is still zero configuration, but version 1.1.0 adds a small Settings screen for sites that need more control.
<h3>Features</h3>
<ul>
<li>Make post featured images clickable</li>
<li>Link single-post featured images to the full-size image file</li>
<li>Link archive and Query Loop featured images to the post permalink</li>
<li>Optional attachment-page or no-link behavior on single posts</li>
<li>Optional no-link behavior on archives</li>
<li>Enable only the post types you want</li>
<li>Works with the core Featured Image block and Query Loop block</li>
<li>Tested with GeneratePress, Twenty Twenty-Four, and common lightbox workflows</li>
<li>Lightweight: no front-end JavaScript unless Meow/Lightbox compatibility is needed</li>
</ul>
<h3>When to use it</h3>
Use this plugin when:
<ul>
<li>Your blog archive thumbnails should link to posts.</li>
<li>Your single-post featured image should open in a lightbox.</li>
<li>Your theme displays featured images but does not make them clickable.</li>
<li>You want a small plugin instead of a full gallery or lightbox suite.</li>
</ul>
<h3>Settings</h3>
Go to Settings > Clickable Featured Image.
Available settings:
<ul>
<li>Single posts and pages: full-size image file, attachment page, or do not link.</li>
<li>Archives and query loops: post permalink or do not link.</li>
<li>Post types: choose which public post types with featured image support should be affected.</li>
</ul>
Defaults match the original plugin behavior: single posts link to the full-size image and archive images link to the post.

Clickable Featured Image

Make WordPress featured images clickable. Link post thumbnails to the full-size image, attachment page, or post permalink.

Bulk-Select Featured Image vs Clickable Featured Image