Pdf

Resize

1	`convert -units PixelsPerInch input.pdf -density 150 output.pdf`

Different options for -dPDFSETTINGS for different resolutions. /screen and /ebook.

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