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In Gallery Vault - Hide Photos & Videos, you can hide the pictures with a four digit PIN, it provides you the hint question and answer which helps you when you forgot the password. It will not upload any of pictures, documents, videos to any server, it will just store the pictures, files in your phone storage.
This app has a beautiful design, Gallery Vault - Hide Photos & Videos provides you the amazing, smooth browse experience. Simply import your images, videos that you want to keep private in to this app, no one knows the existence of those files except you. You can customize the app with Dark/Light modes provided in Settings.