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ice70 · 03-28-2026, 07:24 AM

I am running calibre 9.6 on windows 11, but this is something that has happened on the last few updates - I don't think it is a problem with the software, more something I have unintentionally done.

When I add a book to calibre, it used to create a thumbnail from the book file [mainly pdf and epub], but now it no longer does - I just a default blue background with a frame and no text.

This started after I altered the regex from some book imports [preferences => import/export -> adding books] - but I do not see anything in this preference setting to might account for the book cover no longer working.

I can set the cover in the book's edit metadata -> individual using the top right icon next to the file format. I can also set it via the download metadata.

Can anyone point me in the right direction on how to fix this?

It is purely for book covers in calibre - not when transferring books to a kindle which seems to be most of the search results.

03-28-2026, 07:24 AM	#1
ice70 Junior Member Posts: 3 Karma: 10 Join Date: Mar 2026 Device: kindle	Book cover no longer generated on import I am running calibre 9.6 on windows 11, but this is something that has happened on the last few updates - I don't think it is a problem with the software, more something I have unintentionally done. When I add a book to calibre, it used to create a thumbnail from the book file [mainly pdf and epub], but now it no longer does - I just a default blue background with a frame and no text. This started after I altered the regex from some book imports [preferences => import/export -> adding books] - but I do not see anything in this preference setting to might account for the book cover no longer working. I can set the cover in the book's edit metadata -> individual using the top right icon next to the file format. I can also set it via the download metadata. Can anyone point me in the right direction on how to fix this? It is purely for book covers in calibre - not when transferring books to a kindle which seems to be most of the search results.