Generate Post Thumbnails is a free WordPress plugin designed to streamline the process of assigning Featured Images to posts. Utilizing the Post Thumbnails feature available since WordPress 2.9, this plugin automatically selects the first image found in the post content and assigns it as the Featured Image. This functionality is particularly beneficial for users whose themes support post thumbnails and wish to retroactively apply this feature to all existing posts, enhancing the visual appeal of their content.

In addition to its primary function, the plugin offers mass manipulation capabilities for managing the Featured Image property across multiple posts. It includes a logging feature to track successful and failed operations, ensuring users can monitor the process effectively. Users also have the option to remove all Featured Images from their posts, which modifies the settings without deleting the actual image files. It is advisable to back up files and the database before utilizing this tool to prevent any data loss.