Files you download from the Internet are often compressed or zipped so that they take up less space and arrive much faster than files that haven’t been compressed. You can easily identify compressed files by their extensions, such as .zip (a common standard used in OS X and Windows) and .sit. Before you can use these files, you must learn how to unzip files on mac computers for proper access – luckily the process isn’t that complicated!
On your Mac, do any of the following: Compress a file or folder: Control-click it or tap it using two fingers, then choose Compress from the shortcut menu. If you compress a single item, the compressed file has the name of the original item with the.zip extension. If you compress multiple items at once, the compressed file is called Archive.zip. From the menu, select “New Image” “Image from Folder.” and choose the folder you want to encrypt. Enter a name, tags (optional), and select where to save the disk image. Choose an encryption level of 128-bit or 256-bit. Click “Save” and then enter a secure password. Right-click your mouse. Select New and then “Compressed (zip) file”. A new zip icon or file will appear, depending on how you are viewing your folder. Select a file by left-clicking your mouse, then drag it into the zip file. Repeat this process for each file that you want to include in the zip file.
Unzipping a file on a mac computer is user-friendly and intuitive. To unzip files on a mac, simply follow the steps below:
Alternatively, if the method above does not work, you can right-click on the .zip package, and select Open With > Archive Utility (default).
Apple used to include a program called StuffIt Expander to decompress zipped files, but doesn’t now that OS X lets you unzip files (but not .sit files). However, StuffIt from SmithMicro Software still comes in handy for opening other types of compressed files, notably the .sit or .sitx compressed types. Go to www.stuffit-expander.com or www.stuffit.com/mac/index.html to download a free version of the software or to splurge for the Deluxe version. In addition to compressing files, StuffIt Deluxe lets you encrypt and back up files.
Meanwhile, you can archive or create your own .zip files through OS X, which is useful if you’re e-mailing a number of meaty files to a friend. Right-click (or Ctrl-click) files you want to compress inside Finder and choose Compress Filename. The newly compressed files carry the .zip extension. The archive is created in the same location as the original file and is named originalfilename.zip. You can also choose File→Compress. If you compress a lot of files at once, the archive takes the name Archive.zip.
By default, compressed files are opened with the Archive Utility. It appears in the Dock (in Leopard) while the files are being unsqueezed, unless you choose to open them with Stuffit Expander or some other program.
On the flip side, you can also archive or create your own .zip files through OS X, which is useful if you’re e-mailing a number of meaty files to a client or friend. Follow the step-by-step instructions below to easily zip files on a mac:
On some Apple computers, you can also compress a file by simply choosing File→Compress. If you compress a lot of files at once, the archive takes the name Archive.zip.