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theducks · 10-18-2018, 10:34 PM

First question: Are you really that tight on disk space? Calibre will deliver whatever format that is highest on the Send To.. profile for the destination (device).

It can be done, but doing so programmatically ( via a search) gets chancy.
there are 2 formats for a title. They can differ among titles (EPUB,PDF for book 1. AZW3, TXT for book 2)
Which one do you want to keep. Book 3 only has PDF, book 4 is only TXT.

See the issues? You can easily remove a single format. The issue, is when NOT to remove it.

10-18-2018, 10:34 PM	#3
theducks Well trained by Cats Posts: 31,086 Karma: 60358908 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	First question: Are you really that tight on disk space? Calibre will deliver whatever format that is highest on the Send To.. profile for the destination (device). It can be done, but doing so programmatically ( via a search) gets chancy. there are 2 formats for a title. They can differ among titles (EPUB,PDF for book 1. AZW3, TXT for book 2) Which one do you want to keep. Book 3 only has PDF, book 4 is only TXT. See the issues? You can easily remove a single format. The issue, is when NOT to remove it.