JWLMerge is a utility to merge 2 or more .jwlibrary backup files. These backup files are created using the JW Library backup command, and contain your personal notes, highlighting, etc.

At time of writing, JW Library has backup and restore commands, but no merge command. This means you can add personal annotations in JW Library on several devices and transfer these between devices, but cannot combine them into a single set. The JWLMerge command is a Windows command-line tool that allows you to merge 2 or more .jwlibrary files into a single backup file that can then be restored onto any device.

Usage

Download the JWLMerge.zip file from the latest release and unzip the contents into a new folder.

https://github.com/AntonyCorbett/JWLMerge/releases/latest

Open a command prompt window and run JWLMergeCLI.exe to view the syntax.

Important Notes

Please use at your own risk! It is possible to crash JW Library by attempting to restore a corrupt backup file, and sometimes the only solution is to reinstall JW Library and reset its data. (This hasn't happened yet with a JWLMerge-generated file.)

You must be familiar with using command-line programs in Windows.

Bookmarks are not currently merged. The resulting merged backup contains your notes and highlighted text, but no bookmarks.

The format of your data in the backup files may change with future JW Library releases and I will try to keep the code up-to-date. If you receive an error stating that the backup file version is not supported then please come back here to see if an update is available.

It is possible that JW Library will eventually feature a merge command or similar functionality, in which case this project will be deleted.

Please review the JW Library terms and conditions of use. Some view the backup data files as their own data and not subject to the conditions; others feel differently. Please make your own decision on this matter.

There is no guarantee of software support. However, if you find a bug or other problem, please feel free to create an issue in this project.