How to Compress a File on a Mac
With the latest version of Mac OS X, version 10.5 Leopard, Mac users can compress large files or folders right in the Finder application. Compressing a file puts the data into a .zip format, which shrinks the file size and can later be expanded on another computer. Compressing data is especially helpful if you need to e-mail large pictures or other files.
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Instructions
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Click on the Finder icon in the dock to open a new Finder window.
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Navigate to the part of your hard drive where the file that you want to compress is located.
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Click on the icon of the file you want to compress.
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Go to the "File" menu at the top of the screen, and choose "Compress." The Finder will now begin shrinking your file or folder into a compressed format. This process could last up to 10 minutes depending on how large the file you are compressing is.
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Double-click on the new .zip file to make sure that the compressed file can successfully expand again.
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