imagemagick reduce size of pdf

Asked Mar 04 '22 at 13:41

Active Mar 04 '22 at 13:41

Viewed 5,098 times

I need to automatically reduce the size of some user uploaded pdfs so that they can be sent via email.

I have a little imagemagick oneliner that reduces the size for me:

convert -density 120 -quality 10 -compress jpeg original.pdf output.pdf

basically exports every page of the pdf in jpg, updates density and quality and repacks the pages in a new PDF.

this works perfectly, except that with this command sometimes the files end up bigger, and I need to rerun tweaking density and quality to get the lowest size where the text in the pdf documents is still readable.

I'm not sure how to automate it. I thought to use identify to get characteristics of the files (height width density... ) and do stuff like half the figures or sth similar. but I'm struggling to get this info about the files.

Any suggestions?

Thanks,

asked Mar 04 '22 at 13:41

Don Giulio

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I was thinking if I can extract size and density data, then I could try working with these – Don Giulio Mar 04 '22 at 14:47
I believe the `-compress jpg` (and perhaps even the `-quality 10`) directives are dispensable. – jarnosz Dec 08 '22 at 18:20
you can use `--compress LZW` or `--compress lzw`, that is better for color pages – Daniel Wiczew Mar 15 '23 at 21:27

imagemagick reduce size of pdf

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