The actual screen size of a 6" K3 screen without bottom bar is 3.5" x 4.5". Be sure to use a very small margin, as in 0.1" or you will get a huge amount of whitespace.
Why in the world would you want to create PDFs though? PDF is the worst format available for ebook readers. Create a MOBI or even an HTML and you will get reflowable text and a faster page turn experience.
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