![]() ![]() ![]() Use Ghostscript ( gs) to compress input.pdf into output.pdf 2020), and there's no need to override those values. Note that I've removed the -dCompatibilityLevel=1.4 part of the command used in some other answers here (including the most-upvoted answer) because this table indicates that 1.5 or 1.7 are automatically used for this setting today (27 Dec. Referencing this answer and this answer, and after trying a bunch of the answers here, and doing a bunch of research and experimenting, I've come up with the following. Depending on the document source, you might want to reduce the color depth ( -depth argument). I was able to achieve great compression ratios for scanned/photographed documents (depending on the settings). 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). jpeg compression might not be the best choice due to compression artifacts. For jpg it is between 1 to 100 with 100 the best quality, but lowest compression Higher pixel densities increase quality and size
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