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I have a set of images stored as separate PDF files. One image per file. Each image takes up one PDF page.

I need to re-scale all of these images, preferably at the command line, so that the image content and the page dimensions of the PDFs are both scaled relative to their original sizes/dimensions. For example: scale all the images by 50% should shrink the size of the image and the dimensions of the page.

Already tried:

  • pdfpages + latex: will re-scale the image but dimensions of the pages stay the same.
  • pdfjam: same problem; can re-scale but page dimensions want to be letterpaper or a4.
  • convert (imagemagick): converts to raster, which I don't want.
  • ghostscript: seems to scale based on absolute new page size, and I need relative page size.

I know one of these must work. I can't figure out where I've gone wrong. I'm on Mac but a Linux solution would work just as well.

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I think I found one:

cpdf -scale-page "0.5 0.5" in.pdf -o out.pdf

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I also had a problem finding a tool that can do something like that; I want to change page size of and rotate a PDF document, but without scaling contents. And I just realized pdfedit (which is a GUI tool, however), can do it:

  • After the document is opened, go to Page/"Edit page metrics", and then edit the x,y positions of left upper/right lower corners, and then Change.
  • After that, can go to Page/"Rotate page 90 Degrees"

Note that:

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