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ISBN & barcode
KDP gives you a free ISBN for each format, or you can buy one from your national agency — Nielsen in the UK, Bowker in the US. Each format needs its own number. Enter them here and the barcode is generated for you from the digits.
Paperback
The edition most picture books are sold in, and the one the cover barcode uses by default.
Hardcover
Optional. A hardcover needs its own ISBN — one number never covers two formats.
Ebook
Optional. Ebooks need their own ISBN for most stores.
Open the cover builderThe barcode is drawn from the ISBN itself, so it always matches the number you save.