Windows: Right-click the folder, select Properties, then Advanced, then check Encrypt contents to secure data
Windows: Use a ZIP tool like 7-Zip, add the folder to an archive, and set a password
Windows: Use a third-party folder locker or encryption app to password-protect the folder
Mac: Open Disk Utility, create a new encrypted disk image, and move the folder into it
Mac: Use Finder compression with an encrypted archive tool such as Keka or The Unarchiver
Linux: Use a password-protected archive with 7z or zip from the terminal
Linux: Use VeraCrypt to create an encrypted container and store the folder inside it
Android: Use a file manager or archive app that supports encrypted ZIP or locked folders
iPhone/iPad: Use the Files app with a secure encrypted app or create a password-protected archive using a third-party app
For any device: Use encryption instead of simple hiding for real password protection
For any device: Keep the password strong and store it safely