Once you are finished copying files and folders to the mounted disk image, eject it like any other disk and the contents will be safely protected within, requiring the password to access again. The default location for new disk images is the Desktop, but if you saved it elsewhere, look there instead. Now you need to locate the image, mount it which will require the password set in the creation process, and drag files and folders into the mounted image that you want password protected. Optional: Uncheck the box next to “Remember password in keychain” – only do this if you’re the only user on the Mac, otherwise anyone can open the image without the password.

At the next screen you will set a password to access the folder – do not lose this password, you will not be able to open the disk image if you do.Click on the contextual menu alongside “Encryption” and choose either 128 or 256-bit encryption (256 is stronger).Name the disk image and set a file size that is appropriate for what you intend to store in there.Click on the “New Image” button at the top of the app.Launch “Disk Utility” located in /Applications/Utilities.How to Password Protect Files & Folders in Mac OS X with Disk Imagesĭo this along with general password protection for maximum effect.

How to lock a folder in mac