How to Reduce the File Size of a PDF Using Preview

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You can reduce the size of a Portable Document Format file on a Mac by using the built-in Preview program's Reduce File Size function. You can also use third-party tools on a Mac to reduce PDF size.

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Reduce PDF Size With Preview

Preview, the OS X utility, provides a mode to reduce a PDF's file size.

Step 1

Click the Applications menu on your Mac's Dock and then click the Preview icon.

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Step 2

When Preview loads, click the File menu and choose Open.

Step 3

In the Open dialog box, choose the PDF file you want to reduce in size.

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Step 4

Click the File menu and, within the menu, select Export.

Step 5

Type a name for the new, reduced-in-size version of the file.

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Tip

Choose a file name different from the original file if you want to keep the original version.

Step 6

In the dialog box, click the Quartz Filter menu and select Reduce File Size.

Step 7

Click the Save button.

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Reduce PDF Size With Other Tools

You can use other tools on a Mac to reduce PDF file size as well.

PDF Squeezer, available from the Mac App Store, can batch-reduce multiple PDF files at once. It shows you the difference in size between the original file and the newly reduced file.

Upload a PDF to the website PDFCompress and download a compressed version. It works from Windows machines as well as Macs and accepts files from cloud services, which may save you a step if the PDF file isn't on your Mac.

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If you have Adobe Acrobat Pro, use its PDF Optimizer feature to adjust the size of PDF files, changing the settings based on how you plan to use the file.

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