To shrink a PDF file (without pictures) you can try:

gs -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=setting -sOutputFile=output.pdf input.pdf

where setting should be replaced by

  • screen
  • ebook
  • printer
  • prepress

 

thanks to: http://www.ehow.com/how_6823473_reduce-pdf-file-size-linux.html

 

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