Apple Notes can lock an individual note, which is handy for a private checklist or details you do not want visible when someone opens the Notes app. It is not the same as making your whole phone or every note private, and Apple documents an important recovery limitation: if you forget a separate Notes password, resetting it will not unlock older notes protected by that forgotten password.
Choose a way to unlock notes
Update your iPhone or iPad, then open Settings → Apps → Notes → Password. Choose to use your device passcode or create a separate Notes password. If your device supports it, you can enable Face ID or Touch ID for convenience. If you choose a separate password, make it memorable and store it safely; Apple cannot recover it for you.
To lock a note, open it in Notes, tap the More button, then choose Lock and follow the prompt. Use the lock control in the note to hide its contents again after reading. Depending on your account and software version, the feature may not be available for notes synced through some third-party services or managed accounts.
Understand the limits before storing sensitive details
A locked note is useful for reducing casual visibility, but it is not a substitute for a strong device passcode, account security or a dedicated password manager. Notes may remain open briefly after you unlock one, so close or re-lock it when you finish. Also consider what appears in notifications, search previews or on another device signed into your account.
Apple says locked iCloud notes use end-to-end encryption when stored in iCloud. That benefit does not eliminate the need to protect the Apple Account and your trusted devices. If a detail is critical, make sure you understand how your note account syncs and how you would regain access if you replace your phone.
Before you lock an important note: choose your unlock method deliberately, test it, and keep a secure recovery plan. A reset password is not a key to notes locked with the old one.
Official guide
Apple: How to lock or unlock notes on your iPhone or iPad
Featured image credit: Meanwell Packaging via Wikimedia Commons, CC BY 2.0. Image source and license.
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