Have you ever tried to send a huge document by email only to get the annoying "file too large" error? Or maybe you only needed to translimit one chapter from a 200-page report, but you sent the whole ...
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, ...