The DocHub editor lets you easily Change PDF size in Preview. It’s effortless to grasp and requires no prior experience with similar editing solutions. Simply add your file, and DocHub will handle everything else, giving you things like:
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To summarize: Open the PDF in Preview. If not default app, right-click PDF and select Open With Preview. Click File, then Export. Next to Export As, name the file. Choose Quartz Filter, then Reduce File Size. Click Save.