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There may come a time when you wish to regenerate your thumbnails or even need to. WooCommerce is one time that comes to mind, if you ever decide to change the size of thumbnails or whether or not they are cropped.
Regenerate Thumbnails
Enters the Regenerate Thumbnails plugin by Viper007Bond. What this will do is allow you to bulk regenerate thumbnails across your site. So no having to go and recreate each thumbnail separately. But the option is there for you to regenerate only certain images.
This is the Regenerate Thumbnails Main Screen