How to reduce pdf file size ?

Ghostscript is a great tool for reducing pdf file size.
On a Debian-based system, make sure to have the ghostscript package installed.

To make the file reduction a reality, run the following command line :

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

There are several options for -dPDFSETTINGS :

/screen : low-resolution, lowest output size
/ebook : medium-resolution, medium output size
/printer OR /prepress : high-resolution with maximum output size

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