This blog post is to announce that pdfsizeopt, a PDF file size optimizer is now available for Windows (Win32) systems. See the Windows installation instructions. Previously pdfsizeopt was available only on Unix systems, with Linux and Mac OS X explicitly supported.
pdfsizeopt is a program for converting large PDF files to small ones. More specifically, pdfsizeopt is a free, cross-platform command-line application (for Linux, Mac OS X, Windows and Unix) and a collection of best practices to optimize the size of PDF files, with focus on PDFs created from TeX and LaTeX documents. pdfsizeopt is written in Python, so it is a bit slow, but it offloads some of the heavy work to its faster (C, C++ and Java) dependencies. pdfsizeopt was developed on a Linux system, and it depends on existing tools such as Python 2.4, Ghostscript 8.50, jbig2enc (optional), sam2p, pngtopnm, pngout (optional), and the Multivalent PDF compressor (optional) written in Java.