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.

navneetkrkashyap

Defaultify Featured Image allows WordPress site administrators to specify a default featured image that will be used when a post doesn’t have one. The plugin now includes an option to enable or disable the automatic application of default images.

Defaultify Featured Image

Set a default featured image for posts, pages, and custom post types with an option to enable or disable automatic application.

Default Image Assistant vs Defaultify Featured Image