Not the most intuitive, but works well
After loading a PDF file, you have to click on a little gear to see your options (the first of which is "Minial [sic] Compression”).
Then you have to click-click to choose the output folder, even though if you choose the origin folder it won’t overwrite but adds “(1)” etc - in other words, the origin folder could perfectly well be the default, saving the user some gratuitous effort.
The great thing, though, is that this (<3 MB) and PDF Outliner (1 MB) give me the functionality I need to remove almost 1 GB of Adobe bloatware from my computer. And it’s much faster than Acrobat!
P Riehl about PDF Compress Expert