7-Zip is a file compression and encryption format available for Mac and PC. It can be used to create encrypted file archives with a .7z file extension.
(Windows instructions also available)
Download the 7zX .dmg file to your computer.
Double-click the .dmg file. This will open the 7zX disk image. Drag the file from the image to your applications folder.
Once this application is installed, you can drag the application to your dock to add a shortcut. It’s necessary to have a shortcut to the program on either your dock or on your desktop because the program works by dragging and dropping files onto the icon.
7-Zip/7zX creates a compressed file that contains one or more files or folders. If you want to include several files in your 7-Zip archive, you will first need to put them all in one folder. If you have questions or require assistance, please contact the ITS Help Desk at (850) 474-2075 or email@example.com.
Drag your file or folder and drop it onto the 7zX icon.
You will be presented with the screen shown below.
Enter a password in the password box then enter it again in the box below to confirm. If you do not enter a password, your file will be compressed, but it will not be encrypted. For maximum security, select a long password containing letters and numbers.
If you will be sharing this file with someone, you must provide them with the password, preferably in-person or over the phone. Never send the password in the same email as the attached file.
Save the .7z file to your desktop or other folder. Then, double-click the file to automatically load 7zX. Enter the password used to encrypt the file. The unencrypted file will be saved in the same folder as the .7z file.