It’s a thirteen-digit number. It’s also one of the first decisions you’ll make as a publisher — and most people don’t realize they’re making it.
When you’re in the thick of it — setting up your title on KDP, there’s a moment early in the process where Amazon offers to assign your book a free ISBN. And if you’re doing this for the first time, that probably sounds like a perfectly reasonable thing to accept, doesn’t it?
It is — sometimes. But I’d strongly suggest it’s worth understanding what you’re actually agreeing to before you click past that screen. Trust me when I say the decision has implications that show up later, and later is a lousy time to realize it.
WHAT AN ISBN ACTUALLY IS
ISBN stands for International Standard Book Number. It’s the unique identifier attached to a specific edition of a book — and it’s what the publishing industry, libraries, retailers, and distributors use to track, order, and catalogue your title(s).
Every format gets its own ISBN. Your paperback, your hardcover, your ebook — those are three separate ISBNs. Same book, different editions, different numbers.
Simple enough, yeah? So, here’s where it gets interesting.
KDP’S FREE ISBN VS. YOUR OWN
When Amazon assigns you that snazzy, free ISBN, that number is registered to Amazon. Not to you. Not to your imprint. To them. Legit.
In practical terms, this means a few things to you. That ISBN is tied to KDP — so…’you can’t take it with you when you go’. If you ever want to distribute through other channels? Nope. It’ll show Amazon as the publisher of record in industry databases, not your name or your imprint. Not cool. And if you ever want to get your book into bookstores, libraries, or onto platforms outside of Amazon’s ecosystem, you’ll run into friction. And you can assume friction also means ‘Nope’.
“The ISBN is tied to KDP — ‘you can’t take it with you when you go.’
Here’s the thing, though; that doesn’t matter to every author. If you’re publishing exclusively on KDP and you have no interest in wider distribution, the free ISBN does the job…so…’Get after it!’
But…if you want to present as a legitimate publisher — if you want your imprint name on the record, if you want the flexibility to distribute broadly, if you’re thinking beyond a single platform — you’re going to want your own ISBN.
HOW TO GET ONE
In the United States, ISBNs are issued through Bowker. You can buy them individually or in blocks — and the per-unit price drops significantly the more you grab (I mean, if you’re planning on publishing more than that book you’ve been working on for months or years). A single ISBN runs around $125 USD at time of writing this. A block of ten can be closer to $295. So again, if you’re planning to publish more than one title or multiple formats, the math on buying in bulk makes sense quickly.
In Canada, it’s a bit different story — and honestly, a better one, IMO. Library and Archives Canada issues ISBNs to Canadian publishers at no cost. Free. Sign me up! You apply, you work through the application process. You get a block assigned to your imprint, and they’re yours. If you’re a Canadian author publishing under your own name or a registered imprint, I happen to think this is one of the few genuinely good deals in the whole publishing process.
Worth knowing about before you click “assign free ISBN” and move on, isn’t it?
THE CANADIAN CATCH: LOW-CONTENT TITLES
It’s not all roses. Here’s something that trips up some (newer) Canadian publishers more than you’d maybe expect — and I’ll be honest; when I was still back in the early days of just ‘friends helping friends’, it caught me too.
Library and Archives Canada’s free ISBN program comes with a list of publication types they won’t assign ISBNs for. And near the top of that list? Low-content titles. Journals, planners, workbooks, logs, trackers — anything where the primary content is blank or near-blank pages intended for the reader to fill or participate in.
The reasoning is straightforward enough: LAC’s mandate is cataloguing published works, and a blank lined journal doesn’t really fit that definition, nor would it be reasonable to try and have them receiving submission copies to verify and store, etc. But if you’re a wellness practitioner, a coach, or a personal development author — low-content titles are often exactly the kind of thing you’re publishing alongside your books (and sometimes even before your book(s)). So, it’s an easy assumption to make that your free Canadian ISBNs cover everything in your catalog…
They don’t. And I’ve hopefully caught you before you had to learn that the hard way.
For low-content titles published in Canada, you’ll need to use a KDP-assigned ISBN, purchase one through Bowker, or source through another provider. If you discover this tidbit after the fact — after covers are designed, after files are uploaded, after everything is live? Well…the fix is doable, but it’s not a five-minute job. Ask me how I know.
The fix, if you find yourself in this situation: update the ISBN on your KDP title, regenerate any cover files that have the old number embedded, and re-upload. It’s annoying, but it’s correctable. And so — as I’ve said, it’s exactly the kind of thing that’s worth knowing about on the front end.
Whether you’re an aspiring publisher, or an author who’s been building up the courage to finally let your manuscript be published, I want you to have the best experience possible.
THE IMPRINT QUESTION
This connects directly to something most first-time authors don’t think about until they’re already mid-process: do you want to publish under your own name, or under a publishing imprint?
An imprint is just a name — it doesn’t necessarily require incorporation or a separate legal entity to get started (although you may have reasons for wanting to seek legal counsel, or additional advice — and make that decision after the fact). It does legitimately change how your book appears in the world, though. “Published by [Your Name]” just reads differently than “Published by [Your Imprint]” — especially to readers, retailers, and anyone you might pitch down the road.
If you have your own ISBN registered to an imprint, you control how that looks (either through your own imprint, or through your publisher. If you’re using Amazon’s free ISBN, Amazon controls it. See where I’m going with this?
Again — neither choice is wrong. But they’re different, just the same. So, knowing the difference before you publish is a lot more useful than figuring it out after the fact.
THE SHORT VERSION
If you’re publishing casually, testing an idea, or staying exclusively on KDP — and you’re not working with a Publisher, the free ISBN is fine. Use it. No question beyond that.
If you’re serious about building a catalog, however, presenting professionally, or distributing beyond Amazon — get your own. Do it. In Canada, it costs you nothing but a registration form (but also be aware; it could take up to 30 days to approve your application). In the US, budget for it like any other publishing expense.
And if you’re a Canadian publisher with low-content titles in your catalog — double-check that list on the LAC site before you assign anything. Future you will be grateful for the diligence.
ISBN registration, imprint setup, and publisher-of-record decisions are all part of the foundation we build with every author at DENNER Media. If you want to get it right from the start, let’s talk about us being your Publisher.