The DocHub editor lets you easily Change PDF size in Preview to send in emal. It’s easy to grasp and requires no prior experience with similar editing solutions. Simply add your file, and DocHub will take care of the rest, giving you things like:
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To summarize the text, you need to open the PDF file using Preview if it's not the default app. Right-click the PDF and select Open With, then Preview. Click File in the menu bar, then Export. Enter a file name, choose Reduce File Size from the Quartz Filter drop-down menu, and click Save.