In a large pdf with high image quality (20 pages, around 400 MB):

For Linux, is there a CLI tool that

  • reduces the file size by reducing the quality of all (or single) images within the pdf
  • allows me to define the amount of compression applied to the images (e.g. by specifying an absolute target file size or target image size percentage)
  • so that, except for the image quality, the overall look of the pdf stays the same?

If not, is there a GUI tool which does this without adding a lot of work?

I browsed through the List of PDF software on Wikipedia, but couldn’t spot the right tool.


There is a good answer on Ask Ubuntu explaining how to reduce PDF file size using ghostscript:

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

Quality can be adjusted using -PDFSETTINGS option, see the original answer for details.

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