Just a quick mention of a cool online tool I found…
I was about to email off a PDF (that I hadn’t created myself) to a discussion list when I noticed it was 6 Mb… which seemed a tad excessive.
Digging around I found SmallPDF, which can shrink them down. It got down to 1.2 Mb, with no noticeable loss of detail/fidelity.
SmallPDF is free for two files per hour, with no watermarks, or USD$6 a month for unlimited, and they have a few other related PDF functions such as file conversions.
Worth a look if you need to do something like this.