Thread: Removing Mobi Books from Calibre? Yes or No?
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Old 06-02-2024, 05:30 AM   #2
theducks
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Do you really need the space?
The DB size won't change (much) because Calibre is a Hybrid of a SQL db and the OS file system. so performance won't improve significantly.

Search:
Code:
formats:EPUB and formats:mobi
To see how many have your issue

FWIW I Keep track of the original format in a custom column. I don't clean out that.

You can select ALL (ABOVE SEARCH results only showing): Right-click: Remove books: OF A SPECIFIC FORMAT: Mobi
This is not un-doable
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