Resizing a PDF using Ghostscript

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You should add the -dFIXEDMEDIA switch:

gs \
 -o output.pdf \
 -sDEVICE=pdfwrite \
 -sPAPERSIZE=a4 \
 -dFIXEDMEDIA \
 -dPDFFitPage \
 -dCompatibilityLevel=1.4 \
  input.pdf

-dFIXEDMEDIA is always required if you need to force a specific paper/page/media size and ignore the paper/page/media size specified in the document. Because PDF always has a paper/page/media size defined (PostScript might have, or might not have…).

(My -o ... is shorter and saves one from adding -dBATCH -dNOPAUSE — but works only for more recent versions of Ghostscript.)

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