When you’re an author, books are your business. To make money from your business (i.e., get your product into bookstores and libraries), your products need an International Standard Book Number (ISBN). This is a 13-digit code that identifies your book’s publisher, edition, and print format. So, how does a self-published author go about getting one?

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ISBN basics

First, you’ll have to determine how many ISBNs you will need. Most self-published authors will need just one for a paperback version of their book. However, you’ll need a separate ISBN for every format of your book you plan to distribute. A hardcover, paperback, EPUB, and audiobook each require their own ISBN. While ebooks typically don’t require an ISBN, it does make tracking easier.

Next, locate an agency in your country that is authorized to issue ISBNs. In the United States, the sole official provider is Bowker. Check out their website (MyIdentifiers.com)for more information.

While you can buy a single ISBN, it isn’t cost-effective if you expect to publish new editions in the future or plan to write more books in the near-ish future. Purchasing a block of 10 ISBNs, for example, could cover you for several projects.

Finally, you’ll need to link your book’s metadata with one of the ISBNs you’ve bought. You can do this through your agent’s website by signing in. Metadata includes the title, author name, format, and publication date.

Note: Some platforms, such as Amazon KDP, offer free ISBNs. However, these are usually restricted to that specific platform. Buying your own ISBN ensures you retain full control and can distribute your work wherever you choose.