kdpbookaiKDP prints a barcode on the back of every paperback and hardcover. If your design puts something important in that spot, the barcode covers it.
How much room to leave
Where it goes
On a paperback the box sits in the lower right of the back cover, 0.25 in from the spine fold and 0.25 in from the bottom trim. On a hardcover it sits 0.375 in from the bottom. Keep that corner a plain, light area with no text.
