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					Originally Posted by MsBarrows   ... I have over 500 books whose covers also need upsizing, OUCH! But at least now I know. | 
	
 Hi MsBarrows ... after using the "Quality Check" plug-in to list out all the books for which you want to resize the cover, you can use a separate Calibre plug-in called "
Resize Cover" that allows you to select those books, and bulk-resize them.  FWIW, a size of 435(w) x 680(h) generally seems pretty good, and you can individually adjust for necessary cropping or distortions.  
The following is a link to the "Resize Cover" plug-in page 
https://www.mobileread.com/forums/sh...d.php?t=150982
i.e. mobileread.com/forums/showthread.php?t=150982
Rob