Digital Publishing: 5 Reasons Your eBook May Need an ISBN


An ISBN (International Standard Book Number) has been the standard in the publishing industry for eons to track title listings, multiple editions, book formats, and sales. Knowing this definition alone might make you instantly jump to the conclusion that you do, in fact, need an ISBN for all formats of your book, including the eBook format. But for eBook formats the ISBN rule gets confusing, especially with the rise of Amazon’s Direct to Kindle program.

Does your eBook (Kindle, Nook, iBook, etc.) need an ISBN?

The short answer: It depends. There are several factors involved in applying ISBNs to eBooks, not the least of which is price. According to Bowker, the ISBN agency, every format of every book should have its own unique ISBN for tracking purposes.

This guarantees publishers are paid the correct amount for book sales, customers know exactly what version of what title they are purchasing, libraries can file eBooks and stock physical books once rather than mistakenly buying the same title twice, and retailers list books correctly in their databases.

However, there is also the price factor to consider. Some eBooks sell only a few dozen copies. With Bowker charging $250 USD for a block of 10 ISBNs, you can burn through them in a hurry and never sell enough eBooks to make up the investment for the ISBN.

Not to mention the cost of proper eBook formatting, professional cover design and retailers’ required discounts. This may make you re-think applying an ISBN to every eBook you publish.

When might your eBook not require an ISBN?

Short answer: If you’re only publishing on Kindle or your own website and nowhere else. Amazon’s Direct to Kindle program has its own internal tracking number assigned to each eBook.

Since your eBook is not sold anywhere else, Kindle tracking is all you need and you don’t need to concern yourself with “wasting” an ISBN on that listing. If you publish a lot of Kindle books from interviews, blog content or transcripts, it’s best not to apply ISBNs to those titles.

Which begs the question, when do you want an ISBN assigned to your eBook?

Answer: When any of the following 5 conditions apply:

#1: You want your eBook to be listed in your own publishing company’s name. There’s nothing like having “Kindle Direct Publishing” appearing on your eBook’s listing to lump you into the same category as much of the cheap, bad quality, self-published eBook sludge flooding the market through Amazon’s Direct to Kindle program.

To truly stand out from what should remain in the digital slush pile, you need your eBook to show it’s published by a “real” publisher. That means becoming a “real” publisher yourself by purchasing a block of ISBNs from Bowker and applying one to each eBook you publish, along with your chosen company name.

#2: You want to sell your eBook with multiple retailers. Because Amazon’s Kindle Store is a closed system, it can use its own tracking numbers to track sales and avoid costly ISBNs altogether. But if you want to list your eBook on multiple retailers’ websites and maximize potential sales through Nook, iPad, Sony Reader and more, these retailers require that your book be assigned its own unique ISBN.

If you use a mass eBook distributor like BookBaby, you may choose to purchase one of their ISBNs at a slightly cheaper rate than buying your own (unless you opt for the block of 100 ISBNs instead of 10), but you will fall into the same trap as many self-published eBook authors by having “published by BookBaby” attached to all your eBooks rather than being tagged as a “real” high quality publisher – yourself.

#3: You want your eBook’s title to rank higher on Google. Purchasing ISBNs gives you the ability to list your book in Bowker’s Books in Print database, which is licensed to search engines like Google. If your eBook is not included in the Books in Print database, it may not show up in internet search results.

Nowadays consumers are accustomed to searching an author or title of a book online prior to purchasing, and with eBooks it’s absolutely essential you make yourself found in the search engines, since consumers can’t walk into a bookstore and purchase an eBook that is not available on the brick and mortar shelf. This, to professionals, is one of the primary reasons to apply the extra expense of an ISBN to eBooks.

#4: You want to make sure you get paid for eBook sales that are rightfully yours. If your eBook does not have its own unique ISBN registered directly to you, your sales can be confused with another publishing company and that company may receive sales reports and money for sales that belong to you. This can be embarrassing and troublesome to clear up, and unless you’re following your eBook sales closely you may not even notice money is missing from your account.

#5 You live in a country that requires an ISBN for eBook formats. Some countries require an ISBN, even for eBooks sold through Amazon’s Direct to Kindle program. When in doubt, do a quick internet search to see if you live in one of these countries.

The standard of applying an ISBN to each format of a book, whether it appears in paperback, hardback, large print, audio or e-formats like Kindle, Nook, iBooks, etc. is a standard that may change as the eBook industry grows and changes. But for now, the best rule of thumb is for eBooks with authors who wish for maximum exposure with their eBooks, applying unique ISBNs are a good investment!

What are your thoughts about purchasing ISBNs for your eBooks? 

Kristen Eckstein
Kristen Eckstein is a highly sought-after publishing authority, multi best-selling author and award winning international speaker who has started over 50 publishing companies and published over 170 books and e-books. In Fall 2013 she challenged herself to write and published a new Kindle book every week for 18 weeks straight.
Kristen Eckstein
Kristen Eckstein


  1. provides free ISBN’s to books published there.

  2. Kristen,

    One can’t help feeling that this ISBN system is a bit of a racket for the companies that sell the ISBN numbers. There seems to be many unanswered questions about these companies and their regulation. For instance: how do they set their prices? Every country seems to have different prices with no obvious common factors. Why is this so? Why isn’t this important topic directly administered by government agencies? How did these companies get this power and authority anyway? Who regulates these companies from a consumer protection point of view?

    As consumers, do we think we are being ripped off? I certainly do. For one ripoff example, why do we need to buy ISBN numbers in blocks of 10? I can’t think of one over-riding commercial reason for that requirement. When all is said and done, the ISBN is just a number. How expensive is it to conduct a number registration system. I’m sure it wouldn’t justify a cost of $25 per number. This is a simple consumer rip-off and everyone who is contemplating the purchase of an ISBN should refer the charge to an appropriate government consumer protection agency on the grounds of consumer gouging. The companies controlling the ISBN system wouldn’t have costs per number that come even close to one hundredth of that $25 cost.

    What can we do collectively, together, to pull down this artificially high cost structure.



    • Graham,

      Thank you for your comment. Unfortunately, in the USA ISBN registrations are government regulated, and our government is greedy. Sad to say, I don’t think there’s anything we can do, even collectively, that would change their “rules.” I would think if every US citizen decided to quit paying their income taxes we’d get better traction. 🙂 Until then, we’re forced to work within the system.


  3. This is great information and clears up many of the questions that a lot of us have about ISBN Numbers. Thanks for breaking this down.. I was never sure if it was an investment I wanted to make. Now I believe, if it is a short report or an e-book of less than 50 pages I will forgo the ISBN but if it is something that I have put a lot of time and effort developing, I will want to get the ISBN. Thanks for sharing

  4. colin bethell says

    Great article. I hope it gets to enough people. This is a very important message for people who have put their time into making strong content. The details you have written can help ensure the content (with isbn) reaches the maximum audience whether the objective is sales or simply to get information to readers.

    • Thanks for stopping by TFOI Colin! Yes, I agree that doing everything the online entrepreneur can to get great content out there, including an ISBN if that is the best choice, is crucial to getting more readers, more leads and eventually more customers.

  5. Kristen,
    I love reading your articles and this title is rarely mentioned. Due to the fast changes in the publishing industry, authors have a difficult time keeping up with the latest and don’t know which way to go. I appreciate your exploration of why and when we should retain our own ISBNs. Thanks for your insight!

    • Bea, thank you for stopping by The Future of Ink! And yes, digital publishing, like nearly everything online, is changing rapidly. That’s why we are so excited to have Kristen Eckstein as one of our core Expert Writers for TFOI…much more of her wisdom to come!

    • Thanks Bea! I appreciate your comment and compliments! I’m glad I could help answer some of your questions. Watch for more “rarely mentioned” topics from me here at TFOI soon!