MobileRead Forums - View Single Post - Need help merging libraries from old to new

Sirtel · 03-13-2026, 06:13 PM

The main rule of calibre is - do nothing with the files directly, don't add/move/delete anything in the library folder itself. Everything must be done via the GUI.

To merge two libraries: first, create a new, empty library (by clicking on the library icon -> Switch/create new library). Then switch back to the old library, select all the books, right-click and choose Copy to library... After this, switch to the new library and use the Find Duplicates plugin to find the duplicate books. If everything is fine, remove the old library (by clicking on the library icon and choosing Remove library...).

Again, don't add/copy/move/delete anything in the library folder. Only via the GUI.

03-13-2026, 06:13 PM	#2
Sirtel Grand Sorcerer Posts: 14,852 Karma: 245111335 Join Date: Jan 2014 Location: Estonia Device: Kobo Sage & Libra 2	The main rule of calibre is - do nothing with the files directly, don't add/move/delete anything in the library folder itself. Everything must be done via the GUI. To merge two libraries: first, create a new, empty library (by clicking on the library icon -> Switch/create new library). Then switch back to the old library, select all the books, right-click and choose Copy to library... After this, switch to the new library and use the Find Duplicates plugin to find the duplicate books. If everything is fine, remove the old library (by clicking on the library icon and choosing Remove library...). Again, don't add/copy/move/delete anything in the library folder. Only via the GUI. Last edited by Sirtel; 03-13-2026 at 06:26 PM.