omerk

<a href="http://fancybox.net/" rel="nofollow ugc">Fancybox</a> is a tool for displaying images, html content and multi-media 
in a Mac-style “lightbox” that floats overtop of web page. It was built using the jQuery library.
This plugin inserts the necessary elements required to run Fancybox on your blog. It also groups 
images within posts using rel attributes. (Based on the code found on <a href="https://wordpress.org/support/topic/automatic-adding-lightbox-rel-and-group-to-images-in-posts" rel="ugc">this</a> 
forum thread)
To disable Fancybox per post: Add a custom field called ‘nofancybox’ and set it’s value to ‘true’. 
Instructions on how to add custom fields to posts can be found at <a href="https://codex.wordpress.org/Custom_Fields" rel="nofollow ugc">this</a> 
codex article.

Fancyboxify

This simple plugin enables Fancybox on image links. It groups all images within a single post and can also be disabled per post.

WPJoli

Supercharge your image & gallery links by displaying a simple, modern, & powerful lightbox.
Works with native guttenberg image/gallery blocks.
<h4>⭐ CHECK OUR OTHER PLUGINS</h4>
<ul>
<li><a href="https://wordpress.org/plugins/joli-faq-seo/" rel="ugc">Joli FAQ SEO</a></li>
<li><a href="https://wordpress.org/plugins/joli-table-of-contents/" rel="ugc">Joli Table Of Contents</a></li>
</ul>
<h3>Why should I choose Joli CLEAR Lightbox over another plugin ?</h3>
<ul>
<li>It does not rely on jQuery</li>
<li>It does not load unless it has to.</li>
<li>It has a very small footprint (only one minified .css file (4Ko) & one minified .js file (8Ko)) </li>
<li>Icons are made from pure CSS, there is no extra images loading.</li>
<li>It does not provide a bunch of heavy unnecessary features.</li>
<li>It loads after your content.</li>
<li>It is meant to remain simple yet offering full customization.</li>
<li>It has been made with love.</li>
</ul>
Dependency-free: No jQuery, only pure JavaScript.
Performance friendly: Styles/Scripts DO NOT load if there are no image links within the content.
Joli CLEAR Lightbox stands for the following:
Customizable
Lightweight
Elegant
Accessible
Responsive.
<h4>Features</h4>
<ul>
<li>Display on posts or pages</li>
<li>Customize media types (jpg, png, gif etc)</li>
<li>Transparent GIF/PNG support</li>
<li>Fully responsive with swipe gestures.</li>
<li>Dark & Light color scheme</li>
<li>Enable/disable Loop over when the first/last image has been reached</li>
<li>Enable/disable Esc key to close the lightbox</li>
<li>Enable/disable Arrow keys navigation</li>
<li>Enable/disable Close on click-away</li>
<li>Display/hide counter</li>
<li>Display/hide caption</li>
<li>Customizable Vertical/horisontal paddings</li>
<li>Customizable background color</li>
<li>Customizable background opacity</li>
<li>Enable/disable background blue</li>
<li>Customizable navigation buttons height</li>
<li>Enable/disable frame border</li>
<li>Developer-friendly. Hooks provided. (See below for details).</li>
</ul>
<h4>Pro Features</h4>
<a href="https://wpjoli.com/joli-clear-lightbox/" title="Joli CLEAR Lightbox Pro" rel="nofollow ugc">Get Joli CLEAR Lightbox Pro</a>
<ul>
<li>All of the free features.</li>
<li>AmbiBackground™: this unique feature makes the background have the same color tone as the current image. It provides a beautiful immersion to the viewer.</li>
<li>Custom Post Type Support.</li>
<li>14+ Themes Included.</li>
<li>Customizable idle timer.</li>
<li>Customizable Maximum image height.</li>
<li>Customizable Maximum image width.</li>
<li>Customizable Border width.</li>
<li>Customizable Rounded corners radius.</li>
<li>Customizable Border opacity.</li>
<li>Enable/disable Frame shadow.</li>
<li>Customizable Image rounded corners radius.</li>
<li>Force Enable/Disable Lightbox per post settings.</li>
<li>Override global theme per post settings.</li>
</ul>
Supported post types: 
* Post 
* Pages 
* Custom Post Type (Pro only)
<h3>Hooks</h3>
How to use ?
Copy & paste the code examples below into your theme’s functions.php file:
<h4>Filters</h4>
<ul>
<li><code>joli_clear_lightbox_disable_lightbox</code></li>
</ul>
Globally disables Joli CLEAR Lightbox site-wide.
<pre><code>add_filter('joli_clear_lightbox_disable_lightbox', function(){ return true; });
</code></pre>
<ul>
<li><code>joli_clear_lightbox_options</code></li>
</ul>
Customizes the options programmatically.
<pre><code>add_filter('joli_clear_lightbox_options', 'my_custom_options_function');
</code></pre>
<h4>Actions</h4>
<ul>
<li><code>joli_clear_lightbox_before_rendering</code> 
Do something before rendering the lightbox</li>
</ul>

Joli CLEAR Lightbox

Ultralight Lightbox for WordPress. Designed for Speed. No jQuery. Responsive with gestures. Simple, Elegant, yet highly Customizable.

Fancyboxify vs Joli CLEAR Lightbox