13 very important numbers for every eBook

The ISBN (International Standard Book Number) is a unique 13-digit code assigned to your book to identify it amongst all the others in the digital marketplace.

Retailers use these codes to track and report sales. Every book — physical or eBook — is required to have its own number if it’s made available for sale.In fact: If you’ve already published your book in physical form, you’ll need another ISBN for the electronic version.

R.R. Bowker is the official agency in charge of assigning and maintaining these numbers in the US. For other countries you can find your local agency here: http://isbn-international.org/faqs/view/17.

Publishers and authors can buy blocks of their own numbers.

A self-published author can buy just one ISBN for $125.

BookBaby.com sells ISBNs for $19 each!


For more information of the basics of eBook publishing, download our free PDF Guide, eBook Publishing: The How-To Guide for Writers.

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From eBook publishing and conversion to print on demand services, BookBaby makes it easy for independent authors to self publish.

6 thoughts on “What is an ISBN and Why Does My eBook Need One?

  1. Klausss says:

    Hey there bookbaby,
    a ISBN number for eBooks is not necessary for eBooks if I only want to publish on e.g. Amazon KDP, right?!

    1. Niky says:

      hy,I have the same problem.I want also to publish a kindle book.what is the difference anyway between kindle and e-book?1if i want to publish on both forms?
      by the way…what is about the publishing rights for a kindle book?

  2. abbas rajan says:

    Hi I’d like to know from u of how do I create an eBook on amazon as my novel is been written on a book and not on my laptop how do I start the procedure? thank u

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