Regen. Thumbs - regenerate WordPress post thumbnails per post in one click!
This plugin adds a button to the WordPress post edit screen (Classic Editor) to regenerate all the thumbnails associated to the post using ajax.
This section describes how to install the plugin and get it working.
/wp-content/plugins/regen-thumbs
directory, or install the plugin through the WordPress plugins screen directly.This plugin does not need settings: once activate, its effect is immediate, and it can be deactivated or uninstalled with no side effect.