iCloud Keychain
Also known as: Apple password manager, iCloud passwords, Keychain sync
iCloud Keychain is Apple’s built-in password manager that syncs your saved passwords, passkeys, Wi-Fi credentials, and payment card details across your devices, end-to-end encrypted. It uses negligible storage and does not count against your iCloud space.
- Syncs passwords, passkeys, and Wi-Fi across Apple devices
- End-to-end encrypted — only your devices can read it
- Uses negligible storage; not a space concern
What iCloud Keychain stores
iCloud Keychain securely keeps website and app passwords, passkeys, verification codes, Wi-Fi passwords, and saved credit-card numbers, then fills them in automatically across your Apple devices. In iOS 18 and later it lives in the dedicated Passwords app.
It is protected with end-to-end encryption, so the data is readable only on your trusted devices — not even Apple can see it. You enable it in Settings > [your name] > iCloud > Passwords and Keychain.
Storage impact
Unlike iCloud Photos or backups, Keychain holds tiny text records and does not meaningfully use device or iCloud storage. If your iCloud is full, Keychain is not the cause — look to photos, backups, and large attachments instead.