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I need to create a printed brochure that is also easily readable on smartphone and other mobile devices. In terms of size, is there a best size (width x length) or aspect ratio for mobile devices?
Can a PDF be optimized in some way to make it easier to view without excessive zooming on a mobile device?
wow alost two years, ok, I am in the same position as you, try using 720x1280, its the same as 9:16 aspect ratio.
It doesn't really matter. Almost all PDF viewers will scale the file to fit the screen size.