The DocHub editor lets you easily Save smaller PDF in Preview. It’s easy to understand and requires no previous experience with similar editing tools. Simply upload your file, and DocHub will take care of the rest, providing you with things like:
Try DocHub now!
Gary from MacMost.com shows several methods of compressing PDF files on a Mac. You can use Preview to compress images, but Automator allows for faster and customizable compression. He demonstrates with a sample PDF of an electric bill that is 6.8 MB, showing the need for compression.