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International Standard Book Number (ISBN)
International Standard Book Number (ISBN)
eBooks
An ISBN isn't required to publish an eBook with KDP. Once your content is published on KDP, Amazon will assign it a 10-digit ASIN (Amazon Standard Identification Number), which is unique to the eBook, and is an identification number for the Kindle Book on Amazon.com.If you already have an ISBN for your eBook, you'll be able to enter it during the publishing process. Do not use an ISBN from a print version of your book; eBook ISBNs must be unique to eBook versions. You can purchase an ISBN from multiple sources on the Web, including the official ISBN body.
Paperbacks
An ISBN is assigned to every published book. An ISBN identifies a book's edition, publisher, and physical properties like trim size, page count, binding type. Every 10-digit ISBN has a 13-digit EAN with a different last digit (the check digit). The EAN will be listed on your cover's barcode.Note: The ISBN in your paperback's files must match the book details entered during title setup.