IT/Software/Command Line Applications/Compression with Ghostscript

The simplest and very effective is

ps2pdf in.pdf out.pdf

You can add in

-dPDFSETTINGS=/screen

Use the following ghostscript command:

gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf

-dPDFSETTINGS=/screen lower quality, smaller size. (72 dpi)

-dPDFSETTINGS=/ebook for better quality, but slightly larger pdfs. (150 dpi)

-dPDFSETTINGS=/prepress output similar to Acrobat Distiller "Prepress Optimized" setting (300 dpi)

-dPDFSETTINGS=/printer selects output similar to the Acrobat Distiller "Print Optimized" setting (300 dpi)

-dPDFSETTINGS=/default selects output intended to be useful across a wide variety of uses, possibly at the expense of a larger output file