An ISBN (International Standard Book Number) is not required to publish content with Kindle Direct Publishing. Once your content is published on the KDP website, 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

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.

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