Want to allow others to use your iPhone but have some private data on the phone you do not like other people to see? You can lock the files and folder on iPhone so only those with passcode can open and view them. File Master is a free iPhone file manager which can help you lock files and folders on iPhone for free. You can download this app and read the detailed description of this app below.
How to lock files and folder on iPhone?
Run this iPhone file manager on iPhone. Move all the files and documents you like to lock into a folder, then long press on the folder to show the contextual menu as shown in below screenshot.
With this iPhone file manager, you will be able to zip files on iPhone, zip files with password on iPhone. These two options work similarly as WinRAR on PC. If you do not want to compress files, but merely lock files and prevent them from unauthorized access, you can choose the Lock option. After that, you will be able to choose a 4 digits password or passcode to lock the data.
Repeat the passcode input, the selected folder with files and documents beneath will be protected with password. Anyone trying to view, open, cut, move, delete the folder will need to unlock the folder first. You can’t delete locked folder which is protected with a password by FileMaster on iPhone.
An easier way to protect files and documents on iPhone
This iPhone file manager supports app password which means you can set a passcode to protect the app itself. When you try to open or launch the file manager it will prompt you to enter the password, otherwise you can not even open this file manager app. This is a quickly way to protect all files and data within the file manager. If you like, you can also set a different password to lock the folder as mentioned above for higher security level.