Recompress

I found Re-compress effective for what I needed after a bit of experimentation, especially using the settings of "Compress" (as distinct from "Highly compress"); the 6th notch on the slider; and 100 dpi. This reduced a 4.1 MB PDF to 1.5 MB. (The 6th notch was much better than the 4th, at a cost of only an additional 7% in file size.) Re-compress has rescued me, for only $10, from the file reduction feature in Adobe Acrobat that only works intermittently on my iMac, and the all too complicated steps using ColorSync Utility.app » Filter in MacOS.

That said, I experienced a bizarre outcome when I selected "High compression", 300 dpi and the slider three-quarters up the scale: my 4.1 MB file grew to 16.7 MB! Go figure...

Doesn't seem to work at all here on OS 10.9.5. A blank window briefly appears and then nothing! No compressed files anywhere and (luckily) the original file is untouched... There's not even a selectable destination pref!

I found Re-compress effective for what I needed after a bit of experimentation, especially using the settings of "Compress" (as distinct from "Highly compress"); the 6th notch on the slider; and 100 dpi. This reduced a 4.1 MB PDF to 1.5 MB. (The 6th notch was much better than the 4th, at a cost of only an additional 7% in file size.) Re-compress has rescued me, for only $10, from the file reduction feature in Adobe Acrobat that only works intermittently on my iMac, and the all too complicated steps using ColorSync Utility.app » Filter in MacOS.

That said, I experienced a bizarre outcome when I selected "High compression", 300 dpi and the slider three-quarters up the scale: my 4.1 MB file grew to 16.7 MB! Go figure...