Xiangxu

Default Image Assistant allows you to assign a default featured image for each public post type in WordPress. 
If a post has no featured image set, the plugin automatically loads the default image you assigned.
Perfect for: 
* Blogs that require a fallback image 
* Custom post type archives 
* Editorial workflows 
* Sites with large content teams
Features: 
* Visual Media Library selector for each post type 
* Clean and modern card-style admin UI 
* One-click remove default image 
* No front-end bloat—only loads when needed 
* Works with all themes (including block themes)

Default Image Assistant

A lightweight tool that lets you assign default featured images for any post type using a simple media selector.

senzastile

Senzastile Featured Image Fallbacks helps you keep archives, card grids, and theme layouts visually consistent when posts are missing a featured image.
If a post or custom post type doesn’t have a thumbnail, the plugin intercepts the request on the frontend and serves a default fallback image or placeholder from your Media Library. No database modification, no layout breakage.
Key features
<ul>
<li>Upload and manage a pool of placeholder images</li>
<li>Drag-and-drop image ordering</li>
<li>Stable Random mode for consistent placeholders per post</li>
<li>Pure Random mode for a different placeholder on each page load</li>
<li>Enable placeholders for selected public post types</li>
<li>Lightweight and database-safe implementation</li>
</ul>

Senzastile Featured Image Fallbacks

Automatically display default fallback featured images or placeholders for posts and custom post types missing a featured image.

Default Image Assistant vs Senzastile Featured Image Fallbacks