What Is an ISBN?
ISBN stands for International Standard Book Number. It is a unique 13-digit commercial identifier for books used by bookstores, libraries, and online retailers to track inventory and process orders accurately. 13-digit ISBNs begin with prefixes 978 or 979.
Why an ISBN Is Essential for Book Publishing
An ISBN is required for book distribution, especially for print editions. An ISBN organizes your book metadata across global sales networks. You can self-publish an eBook without an ISBN on some single platforms, but having an ISBN is strongly recommended if you distribute wide across multiple retailers. Print books require a dedicated ISBN.
If you publish through a traditional publisher, they assign an ISBN from their own imprint. When self-publishing, you have two options: use a free ISBN assigned by a self-publishing portal, or buy your own ISBN.
Free ISBNs provided by self-publishing portals like Amazon KDP carry restrictions. For example, a free KDP ISBN locks your print edition to Amazon, preventing you from distributing that same print edition through other catalog services like IngramSpark. Buying your own ISBN gives you complete freedom to distribute your book anywhere.
How to Obtain an ISBN
ISBN assignment rules vary by country based on citizenship. Some governments provide free ISBNs to residents, but require authors to register under their personal legal names or restrict distribution outside their home nation.
In the US and UK, official ISBN agencies sell ISBNs directly. In the United States, Bowker charges $125 for a single ISBN. For self-publishing authors on a budget, Bookllo Publishing offers US-based ISBNs registered under our publisher imprint for just $39.
If you are not a US resident, you cannot buy directly from Bowker. We assign a US-based ISBN from our US publisher imprint so you can list your book internationally.
Advantages of a US-Based ISBN
The US represents the largest book retail market globally. Using a US-based ISBN lists your book in the central US ISBN registry database and global retail catalogs. This gives your title broader catalog exposure across international bookstores and online retailers worldwide.
Benefits of Buying an ISBN from Bookllo Publishing
Bookllo Publishing provides ISBN assignment services for independent authors while preserving 100% of your book ownership and royalties:
1. Fast and Direct Assignment
We assign your ISBN quickly. After purchase, you submit your book metadata (title, author name, description, category). We submit the metadata to register the ISBN. Your book displays in global databases like Bookwire within 24 hours.
2. Lower Upfront Cost
Instead of paying $125 for a single ISBN from Bowker, you get a US-registered ISBN for $39 through our publisher imprint.
3. Use Our Publisher Imprint
Buying an official ISBN independently often requires registering a business entity or sole proprietorship. Using our registered imprint saves setup time while keeping 100% of your copyright ownership and sales royalties.
4. Unrestricted Distribution
Unlike free Amazon KDP ISBNs, our assigned ISBNs place no restriction on where you print, sell, or distribute your book.
5. Dedicated Author Support
Our team answers your questions about metadata registration, barcode generation, and publisher imprint details.
Get an ISBN for your book today.
You can also purchase an ISBN from FreeISBN.com instantly.