# Library Merger — Keep your Libraries in sync

> Combines two JW Library backups into one, resolving conflicts. (iPhone/iPad app by Andreas Skorczyk.)

- Source: https://appshunter.io/ios/app/library-merger/id1539780103 (this page in markdown: same URL + `.md`)
- Developer: [Andreas Skorczyk](https://appshunter.io/developer/1539780105)
- Category: Utilities, Productivity
- Price: Free
- Rating: 4.60/5 from 38 App Store ratings · 59 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.0 · 13 MB
- Languages: American English, German (Germany)
- Released: 2020-12-07
- Data updated: 2026-07-17
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/library-merger/id1539780103/reviews.md

## What is Library Merger?

You know the problem: You study with JW Library® on different devices - and in the end, you have two versions, that you can’t easily combine anymore. With the Library Merger this is a thing of the past!
The Library Merger allows you to quickly and easily combine two JW Library® backups into one. Simply open both backups in the app (you can even send them via AirDrop). The app will merge them into one. If it finds a conflict (like two bookmarks at the same place, or two markings that overlap), you can choose which version to keep. In the end, you have one merged backup which you can easily restore on your devices. The process - if done regularly - literally takes you seconds!

Library Merger is still in its early stages and is being actively developed. The code is open source and can be found on GitHub. If you found a bug or have suggestions, feel free to contact me.

## Key features

- Combine two JW Library backups
- Resolve content conflicts
- Restore merged backup to devices
- Open backups via AirDrop
- Open-source code

## Recent user reviews (10 of 59)

All indexed reviews: https://appshunter.io/ios/app/library-merger/id1539780103/reviews.md

### 5/5 — Indispensable

*2026-07-05*

Well I have an iPhone, an iPad, a desktop computer and a laptop computer. I do most of my work on the iPhone and iPad so once I sync them I export the database to the desktop and laptop. It's great having everything INSYNC! Thank you!

### 3/5 — Beware

*2026-01-28*

It’s good for merging files. But beware, it will delete your playlists. Also, for some reason if you keep your backups in Google Drive, you can select files. Works fine with one drive. But not Google Drive. I’ve never been able to figure out how to select the backup from Google Drive.. the files won’t let you select them.

### 5/5 — A must have app for JW Library users

*2026-01-14*

I use my laptop, tablet, and phone in so many different situations that I often get out of sync on which device has my most current information. This app has been a lifesaver more than a few times. I will never delete it. Thank you for all the work you put into it, and please keep it updated, it is truly appreciated.

### 5/5 — Awesome work

*2025-10-23, version 0.7.7*

Thanks for this app. Works amazingly well.

### 5/5 — Excelente app

*2025-07-03, version 0.7.7*

Sería bueno que funcionara las listas de reproducción

### 5/5 — Excellent

*2025-04-20, version 0.7.6*

Worked perfectly please continue to support this app.

### 5/5 — Awesome

*2025-04-09*

Super cool tool. Thank you sooo much whoever did this. The initial process took me 5-10 minutes, and I have a'lot of notes. This will make things so much easier going forward

### 5/5 — This app is really helpful to our bros and sis!

*2025-02-08, version 0.7.6*

I thank you so much, my brother!

### 5/5 — Enfin une solution rapide et efficace !

*2025-01-29, version 0.7.6*

Plus besoin de se creuser la tête ou de devoir choisir un appareil pour prendre des notes ou préparer ses réunions.
Avec cette app et airdrop, c’est ultra simple et on ne perds plus rien !
Merci.

### 5/5 — Simple and effective

*2025-01-03, version 0.7.6*

Easy to use, walks you through it and even manages conflicts with ease. Used it to merge 3 devices into 1 backup

## Frequently asked questions about Library Merger

### What does the Library Merger app do?

The Library Merger app is designed to help users of JW Library synchronize their study materials across different devices. It allows you to combine two separate JW Library backups into a single, unified backup file. This ensures that your bookmarks, notes, and other library content are consistent regardless of which device you use.

### How does the app handle conflicts between backups?

If the app detects a conflict, such as duplicate bookmarks or overlapping markings in the same location, it provides you with the option to choose which version of the content you want to keep. This manual resolution process ensures that you have full control over the final merged backup.

### Is Library Merger a free app?

Yes, Library Merger is a free application. The description indicates that it is open source and available without cost to users. There are no in-app purchases or advertisements mentioned.

### What devices is Library Merger compatible with?

While specific operating system compatibility is not detailed, the app is designed to work with JW Library backups. It mentions features like sending backups via AirDrop, suggesting compatibility with Apple devices. The core function is to merge backup files that can then be restored to your JW Library installation on your devices.

### What are the main use cases for Library Merger?

The primary use case is for individuals who use JW Library on multiple devices, such as a phone and a tablet, and want to ensure their study notes, bookmarks, and highlights are identical on both. By regularly merging backups, users can maintain a single, up-to-date library, saving time and preventing data loss or duplication.

## Version history (last 5 releases)

### 0.8.1 — 2026-07-16

Fixed an issue that prevented some JW Library backups containing newer, larger document IDs from being imported. Thank you, Rodrigo, for reporting it!

### 0.8.0 — 2026-05-12

This update adds support for backups created by the latest JW Library version. 
Support for older backup version have been removed. If you need to merge an older backup, you can import it into JW Library first and export it again. This makes sure it is using the latest version.

### 0.7.8 — 2026-02-23

Added a legal note that should make it clear that the app is not owned or operated by Watch Tower Bible and Tract Society of Pennsylvania, however it is distributed with permission under a license from Watch Tower.

### 0.7.7 — 2025-06-03

This release solves multiple bugs:

* (Hopefully) fixed an issue that prevented users from importing backups with the error message "Error while creating temporary directory". If you still face this problem, please let me know - it's not an easy one..
* Fixed an issue where users couldn't import backups from OneDrive. They would get the error message: "The file couldn’t be opened because you don’t have permission to view it.".
* Fixed a crash during merge conflict resolution

Thank you for all the reports! If you notice any issues, feel free to write me at jwlm@andreas-sk.de

### 0.7.6 — 2023-10-23

Adding support for importing backups of different versions. For some reason, JW Library might switch between two versions when exporting a backup, which previously resulted in incompatibilities when trying to import it to Library Merger. Recent "Backup incompatible" errors should be fixed now. Sorry that some of you might not have been able to merge for the last couple of weeks.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-17.*