The related muPDF is even available on the App Store. Ghostscript is available through a number of venues for macOS. Meaning: most of the time the savings gained might be very good, but sometimes the file size even increases. Those given here should not perform any lossy conversions or strip away important document structures. Gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -dCompatibilityLevel=1.7 -dNOPAUSE -dQUIET -dPDFSETTINGS=/prepress -sOutputFile=Name_of_Outputfile.pdf To_Reduce_Input.pdf GhostScript with the following parameters:.Instead of Image Magick or Preview I suggest to try: Also: while you may not visually discern any quality loss, it is still a lossy procedure, but with less aggressive settings then the original Quartz-filter.) those PDFs with not much structure, without Bookmarks. (Although answer might well be worth a try for simple documents, e.g. Preview is very limited in its capabilities. Select your new filter when exporting file. Change compression setting, image size and add unique display name for your filter.

The file should contain XML with new filter - you can base on the /System/Library/Filters/Reduce File Size.qfilter file or use my below example.

Add there new filter file with unique filter - f.e.Create new directory (if you don't have it) - /Library/Filters.

Thankfully, a custom filter can be added. The problem is - the default filter used during conversion has very low conversion settings.

How to reduce a file size on mac