Combine your JW Library backups

Keep your highlights, notes, and bookmarks in sync across all your devices.

Keep your highlights, notes, and bookmarks in sync across all your devices — in just a few clicks.

Uses sql.js for in-browser SQLite and fflate for ZIP handling.

🔒 Your files stay on your device. Nothing is uploaded to a remote server. All processing is done right in your browser.
1 Choose your two backup files
📱 Primary Your main device Tap or drop a .jwlibrary file here
💻 Secondary Your other device Tap or drop a .jwlibrary file here
Which file should be Primary? Use the backup from your most-used device, or the one with your most recent notes. When the same item exists on both devices, the Primary version is kept.
2 Merge the two files together
3 Download & restore
✓ Your merged backup is ready!
⬇ Download
How to restore: Open JW Library → Menu → Backup & Restore → Restore — then choose the file you just downloaded.