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What Is an ISBN?
An ISBN (International Standard Book Number) is a unique number used to identify a specific book, edition, and format. Booksellers, libraries, distributors, and publishing platforms use ISBNs to distinguish one publication from another.
Think of an ISBN as part of your book’s publishing identity. It helps identify what the book is, which version it is, and who is listed as its publisher.
A paperback, hardcover, and eBook are different formats. When an ISBN is required, each format generally needs its own ISBN rather than sharing one number across every version of the book
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GOOD TO KNOW:
An ISBN identifies the publication—not the author. The same author can publish multiple books, and each qualifying format or edition will have its own ISBN.
Do All Books Need an ISBN?
Not every type of book requires an ISBN, but most books intended for print distribution will use one. If you plan to publish a paperback or hardcover, each format generally needs its own ISBN because each is considered a separate product.
eBooks work a little differently. Some platforms do not require an ISBN for an eBook. For example, Amazon Kindle books can be published without one because Amazon assigns its own identifier, known as an ASIN (Amazon Standard Identification Number).
An author may still choose to assign an ISBN to an eBook, particularly when distributing it through channels where an ISBN is required or useful. The important thing is to determine your formats and distribution plans before assigning ISBNs.
GOOD TO KNOW:
One ISBN should not be used for both your paperback and hardcover. Each format that requires an ISBN needs its own unique number.
Free ISBN vs. Your Own ISBN: What’s the Difference?
When self-publishing, authors may have the option to use a free ISBN provided by a publishing platform or obtain their own ISBN. Both options can identify your book, but there is an important difference in who is associated with the ISBN as the publisher of record.
A free ISBN can be a convenient option for authors who plan to publish primarily through the platform providing it. However, that ISBN is tied to that platform’s publishing arrangement and generally cannot simply be transferred for use with another publishing service.
When you obtain your own ISBN, you have greater control over the publishing identity connected to your book. In the United States, ISBNs are obtained through Bowker, the official U.S. ISBN agency. The registrant can assign the ISBN to the appropriate book and format and provide the publisher/imprint information associated with it.
Owning your ISBN can be especially useful if you plan to publish under your own business or imprint, use multiple distribution channels, or want greater control over your book’s publishing identity.
GOOD TO KNOW:
DBHH Publishing does not need to own your ISBN for us to professionally publish your book. Your publishing identity, rights, royalties, and publishing accounts can remain under your control.
What Does “Publisher of Record” Mean?
When an ISBN is assigned to a book, information associated with that ISBN identifies the publisher or imprint connected to the publication. This is sometimes referred to as the publisher of record.
For independent authors, this distinction can matter. If you purchase and register your own ISBN, you can use your own publishing business or imprint name, when applicable, rather than having the identity of a platform-provided ISBN associated with the book.
This does not determine who owns the copyright to your book. Copyright ownership and ISBN registration are separate matters. An author can own the copyright to their work regardless of whether they use a free ISBN or purchase their own.
Understanding the distinction helps you make a publishing decision based on the level of control and publishing identity you want for your book.
GOOD TO KNOW:
An ISBN identifies a particular publication and its publishing information. It does not transfer ownership of your manuscript or copyright.
How Many ISBNs Do You Need?
The number of ISBNs you need depends on how many formats and editions of your book you plan to publish. An ISBN identifies a specific version of a publication, so one number generally cannot be used for every version of the same book.
For example, if you publish your book as:
Paperback — one ISBN
Hardcover — a different ISBN
eBook — may use another ISBN if one is assigned or required for your distribution plan
If you later publish a substantially revised edition of the book, that new edition may also require a new ISBN. Minor corrections, such as fixing a typo, generally do not create a new edition requiring a new ISBN.
This is why it is helpful to think about your publishing formats before purchasing or assigning ISBNs. An author planning several books or multiple formats may need more than one ISBN over time.
GOOD TO KNOW:
One book can have several ISBNs without being several different books. The different numbers identify its individual formats or editions.
Where Do You Get an ISBN?
In the United States, the official ISBN agency is Bowker. Authors and publishers who want to own their ISBNs can obtain them through Bowker and assign them to their books through their publishing account.
ISBNs can be purchased individually or in groups. Authors who expect to publish multiple formats or future books may find that having multiple ISBNs available better supports their long-term publishing plans.
Publishing platforms such as Amazon KDP may also offer free ISBNs for eligible print formats. These can be useful depending on the author's publishing goals, but they are different from ISBNs purchased and registered directly by the author or publisher.
Be cautious about purchasing ISBNs from unofficial third-party sellers. The organization that originally obtained the ISBN may remain associated with it in the ISBN record, which can affect the publishing identity attached to your book.
GOOD TO KNOW:
If having your own publishing identity is important to you, obtain your ISBN through the official ISBN agency for your country. In the United States, that agency is Bowker.
Does an ISBN Protect Your Copyright?
An ISBN and a copyright serve two different purposes. An ISBN identifies a particular publication, while copyright protects the original creative work contained within it.
Assigning an ISBN to your book does not register your copyright, and purchasing an ISBN does not provide additional copyright protection.
In the United States, copyright protection generally exists once an original work is created and fixed in a tangible form. Authors may also choose to formally register their work with the U.S. Copyright Office, which provides additional legal benefits.
This is why ISBN registration and copyright registration should be treated as separate parts of the publishing process.
GOOD TO KNOW:
ISBN = identification of the publication. Copyright = protection of the creative work. One does not replace the other.
Which ISBN Option Is Right for You?
There is no single ISBN choice that is right for every independent author. The best option depends on how you plan to publish your book and how much control you want over its publishing identity.
If you are publishing a print book primarily through a platform such as Amazon KDP and prefer a simple, low-cost option, a platform-provided ISBN may meet your needs.
If you want your own publishing business or imprint associated with the book, plan to publish across multiple distribution channels, or expect to publish additional books and formats, purchasing your own ISBNs may provide greater flexibility and control.
The important thing is to make this decision before your ISBN is assigned and your book is published.
GOOD TO KNOW:
You don't have to make the decision alone. ISBN guidance is included as part of DBHH Professional Publishing, based on the needs and publishing plans of your project.
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