PDF manipulation

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poppler pdfunite or gs (ghostscript) gives error (encrypted pdf) while manipulating certain PDF files- downgrade these from v.1.6 to v.1.4:

gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -o output.pdf input.pdf

Merge:

pdfunite file1.pdf file2.pdf outputFile.pdf

Or use gs:
gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress -sOutputFile=out.pdf in1.pdf in2.pdf

Reduce size of PDF files:

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

Settings:
  • /screen selects low-resolution output similar to the Acrobat Distiller "Screen Optimized" setting.
  • /ebook selects medium-resolution output similar to the Acrobat Distiller "eBook" setting.
  • /printer selects output similar to the Acrobat Distiller "Print Optimized" setting.
  • /prepress selects output similar to Acrobat Distiller "Prepress Optimized" setting.
  • /default selects output intended to be useful across a wide variety of uses, possibly at the expense of a larger output file.

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