A free app for Android, by Offline Tools Art Applications.
The Gallery Vault – Hide Photos and Video app is a utility that will allow you to hide photos and videos from your device. By installing it on your Android phone or tablet, you can protect your private photos and videos from intruders and nosy friends and family members.
This application is designed to help you hide pictures and videos from the public eye. To do so, you will have to follow a few simple steps. First, download this app from Google Play and install it on your device.
You can choose the ones you want to hide from the rest of the device by setting a password.