Copying tags to different library

THartmann9374 · 07-23-2026, 10:40 PM

How do I export tags from one library to another library providing books in both libraries are same titles? The reason I want to export tags is because I made AZW list that was conversed from ePUB library. But I set tags only in AZW library and want to export back to ePUB library.

Thanks! THartmann9374

theducks · 07-23-2026, 11:55 PM

Tags (the table) is linked to Books (the table) in a linkage table.
Tags has an index that is per library
Books has an index (ID) that is per Library
the link links book ID to Tag index
nothing guarantees the indexes match <<<< between Libraries
I suspect the best way is to Merge Libraries with the one that has tags, being the target.

BACK UP BOTH FIRST

Then select a few un-tagged books: Copy to Library: <tagged library>
That merges the formats into a single book record

For this to work reliably the TITLE and AUTHOR both need to be exactly the same

BetterRed · 07-24-2026, 03:45 AM

Moderator Notice
I moved this from the Editor subforum (which is about the Book Editor (i.e. the XHTML code etc) to the Library Management subforum.

@THartmann9374 - why do you have different libraries for different formats - calibre has always catered for multiple formats of the same book… e.g. EPUB, AZW3, DOCX and TXT… albeit only one of each format.

BR

07-23-2026, 10:40 PM	#1
THartmann9374 Member Posts: 10 Karma: 10 Join Date: Mar 2026 Device: none	Copying tags to different library How do I export tags from one library to another library providing books in both libraries are same titles? The reason I want to export tags is because I made AZW list that was conversed from ePUB library. But I set tags only in AZW library and want to export back to ePUB library. Thanks! THartmann9374

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07-23-2026, 11:55 PM	#2
theducks Well trained by Cats Posts: 31,905 Karma: 64184592 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	Tags (the table) is linked to Books (the table) in a linkage table. Tags has an index that is per library Books has an index (ID) that is per Library the link links book ID to Tag index nothing guarantees the indexes match <<<< between Libraries I suspect the best way is to Merge Libraries with the one that has tags, being the target. BACK UP BOTH FIRST Then select a few un-tagged books: Copy to Library: <tagged library> That merges the formats into a single book record For this to work reliably the TITLE and AUTHOR both need to be exactly the same

07-24-2026, 03:45 AM	#3
BetterRed null operator (he/him) Posts: 22,743 Karma: 34252730 Join Date: Mar 2012 Location: Sydney Australia Device: none	Moderator Notice I moved this from the Editor subforum (which is about the Book Editor (i.e. the XHTML code etc) to the Library Management subforum. @THartmann9374 - why do you have different libraries for different formats - calibre has always catered for multiple formats of the same book… e.g. EPUB, AZW3, DOCX and TXT… albeit only one of each format. BR