I use Nitro PDF Pro to crop white space in PDFs. It actually has an option to "Remove Margins" automatically although better results can be achieved with manual cropping. Manual cropping is a little more involved but still quite manageable - You can apply your cropping setting to all, odd/even or selected pages. I found that after removing pretty much all of white space most (book) PDFs are really well readable in landscape orientation. And even portrait can be quite OK.
@barty What is duokan firmware? and where one can get it?
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