The DocHub editor allows you to easily Resize PDF display in on Mac in Preview. It’s easy to understand and requires no previous experience with similar editing tools. Simply add your file, and DocHub will take care of everything else, providing you with things like:
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First, open the PDF. If Preview isnt your default app, right-click the PDF, then select Open With, followed by Preview. From the menu bar at the top, click File, and then click Export. In the window that pops up, next to Export As, type in a name for the file. Then click the drop-down menu next to Quartz Filter and click Reduce File Size. Click Save.