A Goodreads user
A Goodreads user asked Nenia Campbell:

I see you have a blog, Do you know why covers come out huge and blurry before you click on the post and how to fix it? Link: https://herewithbooks.blogspot.com/

Nenia Campbell I think it's because some of the book covers are low resolution images if you're copying them from Goodreads. You can resize the images within most blogging platforms but if the original image is low-res, as far as I know there is no way to fix.

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