Tsubu

<p>ReformBox extends WordPress Lightbox functionality beyond images. It currently supports Group, Paragraph, and Video blocks with poster images directly, while delegating Image lightbox behavior to WordPress core. For <code>core/image</code>, ReformBox only syncs the sidebar toggle with core lightbox settings.</p>
<p><a href="https://github.com/tbshiki/reformbox" rel="nofollow ugc">This plugin is developed on GitHub.</a></p>
<p><strong>Supported Blocks:</strong></p>
<ul>
<li>Image Block – Uses WordPress core lightbox behavior (ReformBox panel toggles core <code>lightbox.enabled</code>)</li>
<li>Video Block – Opens in a lightbox when a poster image is set (poster acts as the click trigger)</li>
<li>Group Block – Supports both <code>same</code> mode (same content in page + modal) and <code>split</code> mode (separate Preview/Modal direct child Group slots)</li>
<li>Paragraph Block – Click to open itself in a lightbox</li>
</ul>
<p><strong>Features:</strong></p>
<ul>
<li>No-code lightbox creation via block editor controls</li>
<li>Core-first image lightbox integration (<code>core/image</code>)</li>
<li>Core-aligned overlay markup for custom lightboxes</li>
<li>Core-aligned zoom animation</li>
<li>ESC key and overlay click to close</li>
<li>Accessible (ARIA attributes, focus management, keyboard navigation)</li>
<li>Group split mode with Preview/Modal slot mapping</li>
<li>Safe split fallback: if no Modal slot is assigned, Preview content is used</li>
<li>Lazy-loaded assets (CSS/JS only loaded when needed)</li>
<li>Self-lightbox videos defer preload/autoplay until opened</li>
<li>Core image workflow integration without overriding core image rendering</li>
<li>Global overlay background color and opacity controls in Settings > ReformBox</li>
<li>Plugin list row includes a Settings action link for quick access</li>
<li>Lightweight and performant</li>
</ul>


ReformBox

Universal Lightbox for WordPress – lightbox support for Group, Paragraph, Video blocks with poster images, and core Image workflows.

themifyme

<p>Themify Popup allows you to display beautifully responsive pop up windows on any page of your website. You can use it to showcase newsletter subscription forms, promotional announcements, or general lightbox content. You can allow popups to show on the entire site, or on certain posts, pages, categories, specific user roles, or even at specific times (so you don’t have to manually disable the popups). It’s fully integrated with the Themify Builder allowing you to design any popup layout on the frontend with the drag & drop interface and live preview.</p>
<h4>Popup Styles:</h4>
<ul>
<li>Auto Close</li>
<li>Classic Center</li>
<li>Fullscreen</li>
<li>Time Delay</li>
<li>Slide-out Bottom</li>
<li>Slide-out Right</li>
<li>WordPress Editor Content</li>
<li>Manual Launch</li>
</ul>
<p>Please visit this page for demos: https://themify.me/popup/.</p>
<h4>Features:</h4>
<ul>
<li>Classic Popup – Show popup with a classic overlay with option to set the popup position</li>
<li>Slide-out – Slide the popup from either top, left, bottom or right edge</li>
<li>Fullscreen – Be extreme! Show the popup fullscreen that covers that entire screen</li>
<li>Schedule Popup – Set the date and time for when the popup with appear. Great for showing promotional popups!</li>
<li>Guests or Admins – Show popups to either guest visitors, logged-in users, or both</li>
<li>Time Delay – Set exactly (in seconds) when the popup will appear</li>
<li>Page Viewed – Show popup when viewer has visited a certain number of pages on the site</li>
<li>Scroll Position – Show popup when viewer scrolls to certain position of the page</li>
<li>Launch Popup Button – Insert a button to launch popup manually (like a lightbox link button)</li>
<li>Popup Dimensions – Enter custom popup dimensions for each popup and set custom overlay color</li>
<li>Animation – Over 40+ animations to choose for opening and closing popup transitions</li>
<li>Show Popup Once – Do not show the same popup to the same visitor for a certain number of days</li>
<li>Auto Close – Close popup automatically after a number of seconds it is opened</li>
<li>Mobile Disable – Options to disable popup on mobile devices (to avoid SEO mobile penalty by Google)</li>
<li>Themify Builder Integration – Design any popup with Themify Builder or the free Builder Lite plugin. It comes with a few sample popup layouts</li>
</ul>
<p>Check out our documentation page here – https://themify.me/docs/popup-documentation</p>


Themify Popup

I have been hunting for a simple, straightforward popup plugin for months. This one works perfectly for my needs; and it does not have conflicts with my themify.me themes.

Very helpful plugin

Turn visitors into subscribers and increase sale conversions! Use Popup to show newsletter forms, promotions, or lightbox content.

ReformBox vs Themify Popup