It is possible to compress a PDF in Preview. I have done it many times and the results vary in terms of savings and quality.
*In the Preview app on your Mac, open the PDF, then choose File > Export.
*Click the Quartz Filter pop-up menu, then choose Reduce File Size.
On a Mac since 1984. Currently: 24" M1 iMac, M2 Pro Mac mini with 27" BenQ monitor, M2 Macbook Air, MacOS 14.x; iPhones, iPods (yes, still) and iPads.
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