NullKey Bring photos into the vault
Use Android’s document picker to select photo copies for NullKey. Open the unlocked vault and inspect a few images at full size. Originals remain in place by default.
Know where protection applies
NullKey encrypts contents stored in its vault. A photo outside the vault, visible while the phone is unlocked, or copied to another app is outside that protection. Hidden and locked folders on Android manufacturers’ devices have their own behaviour.
Keep a recoverable copy
Create an encrypted whole-vault backup and wait for its automatic read-back check. Store it separately from the phone and keep its matching passphrase or recovery key somewhere separate. Test restore with sample data into an empty vault.
