When you upload an image to WordPress it generates different sizes and saves them in uploads. Many WordPress themes define new images sizes with but only for images uploaded after the theme was activated. In this video, we will show you how to regenerate thumbnails or new image sizes in WordPress.
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Summary of this Tutorial:
Start by installing and activating the Regenerate Thumbnails plugin.
This will add a section under Tools, Regen Thumbnails.
In this area pressing the regenerate thumbnail button will start generating new image sizes based on your theme.
You can also regenerate individual images by going to Media, Library.
Regenerating images should not affect your original upload or delete previously created images.