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Use the following command: gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf.dPDFSETTINGS=/screen lower quality, smaller size. ( 72 dpi).dPDFSETTINGS=/ebook for better quality, but slightly larger pdfs.

( 150 dpi).dPDFSETTINGS=/prepress output similar to Acrobat Distiller 'Prepress Optimized' setting ( 300 dpi).dPDFSETTINGS=/printer selects output similar to the Acrobat Distiller 'Print Optimized' setting ( 300 dpi).dPDFSETTINGS=/default selects output intended to be useful across a wide variety of uses, possibly at the expense of a larger output file. If you have a pdf with scanned images, you can use convert to create a pdf with jpeg compression (You can use this method on any pdf, but you'll loose all text informations). For example: convert -density 200x200 -quality 60 -compress jpeg input.pdf output.pdf Adjust density (e.g.

100x100) and quality to your needs. Depending on your input jpeg compression might not be the best choice due to compression artifacts. You have the choice between BZip, Fax, Group4, JPEG, JPEG2000, Lossless, LZW, RLE or Zip as alternate compression methods (some only allow b/w images). For details see. I was able to achieve great compression ratios for scanned/photographed documents (depending on the settings). Depending on the document source, you might want to reduce the color depth ( -depth argument).

For a scanned document where the text is what you are interested in rather then the images and preserving depth isn't an issue, jpeg compression is not a good idea because the artifacts tend to be extremely noticeable. If you use pdfimages input.pdf pages to extract pbm files, then you can do something like: for page in.pbm; do convert $page -compress Group4 -type bilevel TIFF:- convert - output.pdf. Any OCR will be lost so I usually then do pdfsandwich output.pdf, which seems to reduce file size even further. – May 4 '15 at 11:57. I needed to downsize a PDF that contained full color scans of a document. Each of my pages was a full color image as far as the file was concerned. They were images of pages containing text and images, but they were created by scanning to an image.

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I used a combination of the below ghostscript command and one from another thread. Gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dDownsampleColorImages=true -dColorImageResolution=150 -dNOPAUSE -dBATCH -sOutputFile=output.pdf input.pdf This reduced the image resolution to 150dpi, cutting my file size in half. Looking at the document, there was almost no noticeable loss of image quality. The text is still perfectly readable on my 2012 Nexus7.

For rewriting scanned pdfs: #!/bin/sh gs -q -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite -dCompatibilityLevel=1.3 -dPDFSETTINGS=/screen -dEmbedAllFonts=true -dSubsetFonts=true -dColorImageDownsampleType=/Bicubic -dColorImageResolution=72 -dGrayImageDownsampleType=/Bicubic -dGrayImageResolution=72 -dMonoImageDownsampleType=/Bicubic -dMonoImageResolution=72 -sOutputFile=out.pdf $1 You could customise it a bit to make it more reusable but if you only have one pdf, you could just replace $1 with your pdf filename and bung it in a terminal.