The general principle of margin setting is that the inner margin is slightly larger than the outer margin, that is to say, the blank on the bound side of the book is slightly larger than that on the unbound side (leaving enough space for binding); For the sake of beauty, the top blank is greater than the bottom blank, which means that the top blank is greater than the bottom blank. In addition, the whole page should be set with 3mm bleeding, which is convenient for cutting.

The exact size depends on the nature of your book.

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