Why would I need to export a PDF? Exporting a PDF is usually the final thing you’ll do after completing g project. The PDF in general is a jack of all trades sort of document. Text, graphics, images, ...
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, ...