Again, this is a benefit to using the “Export” command, since you can compare the two documents easily when it’s finished, which is recommended. That’s not always desirable, which makes this trick best for PDF files that are heavy on text, simple graphs, charts, spreadsheets, or basic vector drawings, and not complete images or photos where high image quality is desired. Keep in mind that Quartz Filters are basically image processing filters, but unlike apps made for lossless image compression, the PDF file will be processed in such a way which may result in lossy compression and artifacts appearing on embedded imagery. For originating documents that are entirely text, like a resume or a Word document that’s been converted to a PDF without any sort of optimization, it can make a huge difference, and you may see a file sized from 1MB shrinking down to under 100k. Just how much space you will save by using this file reduction filter varies greatly, depending on the content of the PDF, the original app that created and saved the PDF and if any filtering was applied to begin with, amongst a variety of other factors.
Additionally, if you don’t need a color document then choosing “Greyscale” as the filter can also dramatically reduce the file size of a PDF document) (Note: you can also access Quartz Filters through “Save As” with new versions of Preview for Mac OS, but the File > Export trick works for prior versions of the app as well. Save the new reduced version of the PDF as usual by hitting “Save”.Select the submenu next to “Quartz Filter” and choose “Reduce File Size”.Pull down the “File” menu and choose “Export”.Open the PDF file that you want to reduce the size for in Preview app (typically Preview is the default PDF viewer in Mac OS * but if not you can find it in the /Applications/ folder of Mac OS).How to Reduce PDF File Size on Mac with Preview Let’s get to it and learn how to reduce the file size of a PDF on the Mac.
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