Pic Lock is a free way of keeping your private photos safe against other people that might use your smartphone or tablet. This application comes with a lightweight build and it should run just fine even on older devices. As soon as you launch the app you will notice a friendly and highly intuitive layout. Right off the bat, you are required to create a passcode before you get to access the features available here.
Remember to create a difficult password and to not forget it. After you complete this step, in the next window you will find two buttons, one for protecting photos and another for protecting sensitive videos. Depending on what type of content you want to lock, you will get into one of these two sections. After an item is added here, it will stop appearing inside your recent files list.
You're also allowed to create your own folders inside the interface. If you want to stop hiding photos or videos, you'll just have to remove them from here. Each time this application is launched you will have to insert the correct passcode in order to gain access to protected content.