Filekin Studio 0.3.43

Compress now tells you where the size is.

A 38MB file is rarely 38MB of document — it is usually one scanned page, or a logo saved at print resolution. The Compress dialog opens with the breakdown above the choice:

Pictures and scans              2.7 MB · 82%
Structure and everything else   325 KB · 10%
The pages themselves            293 KB ·  9%
Fonts carried in the file         7 KB · <1%

and one sentence under it — "27 pictures make up 82% of this file. Reducing image quality is what will shrink it" — or nothing at all, when the file is simply its own pages and no preset will help.

The numbers add up to the file exactly, which took three attempts: measured across 139 real PDFs, the obvious implementations reported images at 133.9% of the document.