How to Sync Custom Dictionary Words in iOS 16

In iOS 16, custom dictionary words sync across your Apple devices through iCloud via the Text Replacement feature. When you add a custom word, shortcut, or unique spelling on your iPhone, iOS uploads this data to your personal iCloud account and automatically propagates it to any other iPhone, iPad, or Mac signed in with the same Apple ID. This guide explains how this synchronization process functions, how to ensure your devices are properly configured, and what to do if custom words fail to sync.

How Custom Dictionary Syncing Works

Apple does not feature a standalone "custom dictionary" settings menu. Instead, iOS 16 handles custom vocabulary through the Text Replacement engine.

When you type a word and prevent autocorrect from changing it, or when you explicitly add a phrase to your Text Replacement list, iOS registers the entry locally. If iCloud Drive is enabled, iOS 16 pushes these entries to iCloud's secure cloud database. CloudKit then synchronizes these entries across your devices in the background, updating your keyboard's learned vocabulary on every connected device.

Requirements for Syncing Across Devices

To ensure custom dictionary entries sync without interruption, verify that all devices meet the following criteria:

  • Same Apple ID: Every device must be signed in to the identical Apple ID.
  • iCloud Drive Active: The Text Replacement database relies on iCloud Drive to transmit data. Go to Settings > [Your Name] > iCloud and verify that iCloud Drive is toggled on.
  • Internet Connection: Both the source device and receiving devices must be connected to Wi-Fi or cellular data.

How to Add Custom Words in iOS 16

To manually add custom words to your synchronized dictionary:

  1. Open Settings on your iOS 16 device.
  2. Tap General, then select Keyboard.
  3. Tap Text Replacement.
  4. Tap the + (plus) icon in the top right corner.
  5. In the Phrase field, type the custom word, name, or jargon exactly as you want it to appear.
  6. Leave the Shortcut field blank if you only want the keyboard to recognize the spelling and stop autocorrecting it, or enter an abbreviation to create an expansion shortcut.
  7. Tap Save.

The new entry will appear on your other Apple devices within a few minutes.

Troubleshooting Dictionary Sync Issues

If your custom words are not appearing on your other devices, apply the following fixes:

  • Toggle iCloud Drive: Go to Settings > [Your Name] > iCloud > iCloud Drive, toggle it off, wait 30 seconds, and toggle it back on.
  • Force a Cloud Update: Add a dummy entry in Text Replacement (for example, "TestWord123"). Saving a new entry often forces iCloud to refresh and pull down the missing dictionary database.
  • Restart the Devices: A standard system reboot forces background processes, including the keyboard synchronization daemon, to restart and recheck iCloud for updates.