attach-thumbnail

Regenerate the thumbnails for one or more of your image uploads. Useful when changing their sizes or your theme.

Delete and REALLY force thumbnail regeneration.

List the most recent posts with post titles, thumbnails, excerpts, authors, categories, dates and more!

Regenerate thumbnails quickly and easily, including forced regeneration; very useful when changing a theme or adding new thumbnail sizes.

Automatically generate the Featured Image from the first image in post or any custom post type only if Featured Image is not set manually.

"Crop Thumbnails" made it easy to get exacly that specific image-detail you want to show in your featured image or gallery image.

AJAX Thumbnail Rebuild allows you to rebuild all thumbnails at once without script timeouts on your server.

Adds multiple post thumbnails to a post type. If you've ever wanted more than one Featured Image on a post, this plugin is for you.

Related Posts by WPBrigade is The Best Customizable plugin, that nicely displays related posts thumbnails under the post.

Creates post thumbnails on fly and cache the result. Auto-create of post thumbnails based on: WP post thumbnail OR first img in post content OR attach …

Get images for your posts with automatic generation & multiple banks. Generate as featured images or in your content with Gutenberg Block and in bulk

Automatically sets the featured image to the first image uploaded into the post (any post type with thumbnail support). So easy like that...

Responsive Recent Posts Widget With Images for WordPress. Lightweight & SEO Optimized Code. Free.

Using external images from anywhere to make thumbnail

Select the thumbnails and functions to disable it.

Automatically regenerates your thumbnails on the fly when thumbnail sizes change.

An UpdraftPlus extension that excludes image size thumbnails, generated by WordPress, from Updraft backups.

Fix image sizes after you have changed image sizes from Media Settings. Ensure your images display consistently across your website.

Add a thumbnail to your taxonomy terms.

Enables upscaling of thumbnails for small media attachments