Mac OS — decrease pdf size via Preview app

To decrease the size of the .pdf filled with images, in Preview you can go to Export and set Quartz Filter→Reduce File Size before saving.

If the images are too blurry for you, you can add your own profile.
1. Create a directory — /Library/Filters.
2. Add new filter file with unique filter — i.e. Reduce Size with good quality.qfilter.
3. The file should contain XML with new filter — you can base on the /System/Library/Filters/Reduce File Size.qfilter file or use the one below. Change compression setting, image size and add unique display name for your filter.

Further reading —

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