By default, WordPress will automatically generate thumbnails of several different sizes for the images you upload, but some WordPress themes will not call these thumbnails at all, and they become redundant. So, how can we quickly delete these generated thumbnails? It is recommended to try the DNUI (Delete not used image) plug-in.
DNUI Delete not used image Introduction and usage
Delete not used image (DNUI for short) is a quick search for unused images A picture plug-in that supports batch deletion of useless thumbnails.
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Then press the plug-in installation interface to search for DNUI to install it online, or download DNUI Delete not used image here to enable the plug-in After that, visit the background - Settings - DNUI, then enter the query quantity (it is recommended to be greater than the total number of your pictures), then click Scan, you can see the results:
Click The "Select All" button at the bottom will select all useless thumbnails (the original images will not be selected), and then click "Delete" to delete them.
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