Use Preview: Open the PDF in Preview, click File > Export, select “Reduce File Size” under Quartz Filter, and save. Use ColorSync Utility: Open the PDF in ColorSync Utility, click File > Export, ...
In case you didn't already know, AirDrop is a feature exclusive to Apple devices like an iPhone, iPad, iPod touch, and Mac computers. It basically allows users to wirelessly send photos, videos, ...
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