06-16-2025, 01:02 PM
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#1 |
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Junior Member
 Posts: 3
Karma: 10
Join Date: Jun 2025
Device: Kobo
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Upload Epub to Calibre Duplicates Files
I would like to know if anyone is aware of the comparison process that Calibre performs when an EPUB file is uploaded to the Calibre library and it detects that the file already exists.
In other words, is the initial duplicate check based on the 1) file name, 2) the book’s title and author, 3) or the file’s unique hash? The latter would be the only method that actually guarantees the book (file) is a true duplicate. Thank you all for your attention, and thanks in advance to anyone who can help clarify this doubt. SR |
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06-16-2025, 02:45 PM
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#2 |
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Well trained by Cats
 
Posts: 31,023
Karma: 60358908
Join Date: Aug 2009
Location: The Central Coast of California
Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A
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I believe it is Title - Author (and that is not 100% guaranteed to catch spelling diffs)
Consider setting the auto merge Preferences: Adding Books: Adding actions to what you would like.  Find Duplicates Plugin has way more compare options 
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06-16-2025, 07:09 PM
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#3 | |
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null operator (he/him)
Posts: 21,708
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Join Date: Mar 2012
Location: Sydney Australia
Device: none
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Quote:
Not sure what it does if Add Books is set to get metadata from the format file, I don't use that option. BR |
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06-17-2025, 01:46 AM
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#4 |
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Bibliophagist
Posts: 45,961
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Join Date: Jul 2010
Location: Vancouver
Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos
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As far as I can tell, the only item checked when adding books is the book title. It has been a bit of a pain when you add a book with the same title as another existing book but by a different author.
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06-17-2025, 03:36 AM
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#5 |
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Junior Member
Posts: 3
Karma: 10
Join Date: Jun 2025
Device: Kobo
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Thank you all for the comments.
I think I’ll use the 'Find Duplicates' plugin after the import, mainly to avoid long upload times. |
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06-17-2025, 09:44 AM
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#6 | |
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Well trained by Cats
Posts: 31,023
Karma: 60358908
Join Date: Aug 2009
Location: The Central Coast of California
Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A
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Quote:
The normal built in check portion of a single book happens almost instantly. (Calibre field data is indexed internally) Find Duplicates can do a more extensive (criteria) check AFTER IMPORT. |
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