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Editorial Team
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Asked: 2026-06-01T18:32:50+00:00

I used pdftk to uncompress a PDF and then opened it as a text

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I used pdftk to uncompress a PDF and then opened it as a text file.
I want to edit the /MediaBox field, which is in my case

/MediaBox [0 0 612 792]

I would like to reduce the margins, for instance 

/MediaBox [100 0 512 792]

Unfortunately it doesn’t work. I can change the 0 into a 2 or a 9 but I cannot put 100 for instance.

Any idea why?

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1 Answer

  1. Editorial Team

    use sed to replace any occurrence

    sed 's/MediaBox \[0 0 612 792*/MediaBox \[100 0 512 792]/g'<in.pdf >out.pdf

    or podofobox (inside podofo utils)

    without needing to uncompress pdf streams first (as needed with pdftk)

    podofobox in.pdf out.pdf media 10000 0 51200 79200

    as you can see, podofobox uses MediaBox values multiplied by 100, since its scale is a sub multiple, so, you need simply to add two zeroes (00) to values you can read in MediaBox field

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