Publishing your book on both Amazon KDP and IngramSpark is one of the smartest moves a self-published author can make in 2026. It gives you the best of both worlds: the massive, consumer-facing power of Amazon and the deep-reaching distribution network of IngramSpark, which serves libraries and independent bookstores.
However, the question of the ISBN (International Standard Book Number) is where most authors get tripped up. The short answer is yes, you can use the same ISBN on both platforms—but there are strict rules and a specific order of operations you must follow to avoid technical errors or duplicate listings.
Here is your detailed guide on how to navigate the ISBN landscape for KDP and IngramSpark.
1. The “Golden Rule”: You Must Own the ISBN
The most important thing to understand is that you can only use the same ISBN on both platforms if you purchased it yourself.
If you use a “Free ISBN” provided by Amazon KDP, that number is legally owned by Amazon. They are the “Publisher of Record.” You cannot take that free number and plug it into IngramSpark. Similarly, if you use a free ISBN from IngramSpark, you are locked into their ecosystem.
To have the freedom to move between platforms, you must buy your ISBNs from an official agency (like Bowker in the US or Nielsen in the UK). When you own the number, you are the publisher, and you can take that number to any printer you like.
2. Why You Should Use the Same ISBN
Using the same ISBN for the same format (e.g., your paperback) across different printers is actually the industry standard.
If you were to use a different ISBN on KDP and a different one on IngramSpark for the exact same paperback, you would likely end up with duplicate listings on Amazon. This splits your reviews, confuses your customers, and dilutes your sales ranking. By using one consistent ISBN, Amazon recognizes that both “versions” are the same book and merges them into one clean product page.
3. The Step-by-Step Guide to Success
To ensure the process is seamless, follow this specific “Order of Operations” used by professional indie authors.
Step 1: Purchase Your ISBN
Go to your national ISBN agency and buy a block of numbers. (Pro-tip: Buying a 10-pack is almost always more cost-effective than buying one at a time).
Step 2: Set Up Your Title on KDP
Start by entering your book details on Amazon KDP. When you reach the ISBN section, select “Use my own ISBN” and enter your purchased number.
CRITICAL: Do NOT check the box for “Expanded Distribution” on KDP. This is the most common mistake. If you select Expanded Distribution, Amazon will send your ISBN into the Ingram network themselves, which will cause an “ISBN already in use” error when you try to upload to IngramSpark later.
Step 3: Save as Draft (Do Not Publish Yet)
You don’t have to hit “Publish” immediately. Many authors prefer to get the book set up as a draft on both platforms first to ensure the metadata matches perfectly.
Step 4: Set Up Your Title on IngramSpark
Now, go to IngramSpark and create a new title. Use the exact same ISBN. Because you didn’t select Expanded Distribution on Amazon, the number should still be “clear” in Ingram’s system.
Step 5: Disable “Global Connect” on IngramSpark
Just as you disabled Expanded Distribution on Amazon, you should ensure that your IngramSpark settings don’t create a conflict. While IngramSpark can distribute to Amazon, you want KDP to handle your Amazon sales directly (as the print quality and royalties are usually better for you there).
4. Understanding Format Conflicts
A common point of confusion is whether the same ISBN can be used for different types of books. In the world of ISBNs, format is everything.
- Paperback: Use the same ISBN for KDP and IngramSpark.
- Hardcover: Needs a new ISBN. You cannot use your paperback ISBN for a hardcover.
- eBook: Needs a new ISBN (though many authors choose to omit an ISBN for eBooks on Amazon).
If you are doing a paperback on both KDP and IngramSpark, you are in the clear. But if you decide to do a “Case Laminate” hardcover on KDP and a “Dust Jacket” hardcover on IngramSpark, those are technically different products and may require different numbers depending on your local agency’s rules.
5. What if I Already Used a Free KDP ISBN?
If your book is already live with a free Amazon ISBN, you cannot “transfer” it. You have two options:
- Accept the Limit: Keep that book on Amazon and simply don’t put it on IngramSpark.
- The “Second Edition” Route: Purchase a new ISBN, unpublish the version with the free ISBN, and republish the book as a “Second Edition” using your own number. This will allow you to then upload the same new ISBN to IngramSpark.
Final Thoughts
Using your own ISBN is an upfront cost, but it provides the professional flexibility required to scale your author business. It ensures that you, not Amazon or Ingram, are the owner of your work’s identity. By keeping “Expanded Distribution” turned off on Amazon, you can enjoy the higher royalties of KDP while still reaching the global library and bookstore market through IngramSpark.
