iCloud Bookmark Sync on iPhone and iPad
LinkBook’s optional iCloud sync keeps its own library across your Apple devices. It is separate from Safari bookmark sync.
Turn on LinkBook sync
- Use the same Apple Account for iCloud on both devices. Check that iCloud is available, storage is not full, and both devices can connect.
- Open LinkBook, tap the Settings gear, and find Sync.
- Enable iCloud Sync on each device. Sync is off by default.
- Use Sync all sources, or select the sources you want included.
- Enable Sync imported reading files if you want reading files available on the other device. Open each file there while online to download it.

What happens to files
The imported-reading-files option covers supported PDF, EPUB, text, DOCX and PPTX Book Mode files. Another device downloads a file when it is first opened. Videos are not included in this reading-file sync option. A visible file record does not guarantee that its bytes are already on the device.
If a save is missing
- Search for the title or URL, and check folders, filters and hidden links.
- Check the same iCloud Apple Account, connection, available storage and source selection on both devices.
- Keep LinkBook open long enough to upload and download changes. In Settings, use Sync Diagnostics to inspect its state.
- If only a PDF or EPUB will not open, check the reading-file sync setting and open it while connected.
Sync and backup serve different purposes
Sync carries library changes between devices. A backup is a saved recovery point. Make a manual local backup before major cleanup or troubleshooting. Do not use Disable and Clear iCloud Sync Data as a routine refresh: it deletes LinkBook’s synced cloud data. Reinstalling is not a safe first step for a library stored on your device.
You can turn sync off at any time. Read the backup and restore guide.