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PeterT · 08-24-2025, 01:09 PM

Calibre will always use the ORIGINAL_EPUB file when reconverting.

See
Release: 0.8.11 [22 Jul, 2011]
New Features

When doing a conversion from some format to the same format, save the original file

When calibre does a conversion from the same format to the same format, for example, from EPUB to EPUB, the original file is saved as original_epub, so that in case the conversion is poor, you can change the settings and run it again. The original is automatically used every time you run a conversion with that format as input. If you want to disable this, there is a tweak that prevents calibre from saving the originals in Preferences->Tweaks. You can easily replace the converted version with the original in the Edit metadata dialog by right clicking on the list of formats in the top right corner.

08-24-2025, 01:09 PM	#2
PeterT Grand Sorcerer Posts: 13,572 Karma: 79436804 Join Date: Nov 2007 Location: Toronto Device: Libra H2O, Libra Colour	Calibre will always use the ORIGINAL_EPUB file when reconverting. See Release: 0.8.11 [22 Jul, 2011] New Features When doing a conversion from some format to the same format, save the original file When calibre does a conversion from the same format to the same format, for example, from EPUB to EPUB, the original file is saved as original_epub, so that in case the conversion is poor, you can change the settings and run it again. The original is automatically used every time you run a conversion with that format as input. If you want to disable this, there is a tweak that prevents calibre from saving the originals in Preferences->Tweaks. You can easily replace the converted version with the original in the Edit metadata dialog by right clicking on the list of formats in the top right corner.