The ISBN question trips up almost every first-time self-publisher, partly because the answer is genuinely different from store to store, and partly because a lot of advice online is out of date. Here is the current picture, plainly, so you do not buy something you did not need or skip something you did.
What an ISBN actually is
An ISBN, International Standard Book Number, is the unique identifier for one edition of one book in one format. The paperback, the hardcover and the ebook of the same title are three different editions, so a book sold in all three formats could carry three different ISBNs. It is what bookstores, libraries and distributors use to order and track a specific edition. Whoever registers the ISBN is recorded as the publisher of record for that edition, and that detail matters more than the fee, which is the theme of this whole article.
Amazon has its own parallel system for Kindle ebooks called the ASIN, which Amazon assigns automatically. That is why a Kindle ebook needs no ISBN at all.
The short answer, store by store
Of the stores a self-publisher typically uses, five will get a book onto shelves without you buying anything, and one will not:
- Amazon KDP: no ISBN needed for the Kindle ebook (it uses an ASIN). For paperback and hardcover, KDP assigns a free KDP-branded ISBN, or you can use your own.
- Draft2Digital: assigns a free ISBN for the editions that need one.
- Apple Books: publishes ebooks without an ISBN.
- Kobo: publishes ebooks without an ISBN.
- Google Play Books: publishes ebooks without an ISBN.
- IngramSpark: requires an ISBN for your print book. This is the one that forces a decision.
Free ISBNs: what "free" actually costs
When a store gives you a free ISBN, there is a real trade, and it is not money. The store, or its identifier partner, becomes the publisher of record for that edition. Your book is still yours, your rights are unaffected, and you can stop using the store whenever you like. But the edition is registered under the store's imprint, not under a publishing name you control, and a free ISBN from one store is generally not portable to another. For a lot of authors, especially for the ebook, none of that matters and the free ISBN is the right, frictionless choice.
When you should buy your own
Buy your own ISBN when you want to be the publisher of record, when you want the same edition to carry the same identifier everywhere it is sold, or when you are building a publishing imprint you intend to grow. In the United States the official ISBN agency is Bowker, through MyIdentifiers.com, and its current prices are:
- One ISBN: $125
- Ten ISBNs: $295, which works out to $29.50 each
If you expect to publish more than one book, or one book in several formats, the block of ten is far better value than buying singles, because each format of each title wants its own number. Outside the US, your national ISBN agency sets its own prices, and in some countries ISBNs are free from the government.
IngramSpark, specifically
IngramSpark is worth its own section because it is the store that requires an ISBN and because its own policy has changed. IngramSpark will not simply assign a hidden identifier the way KDP does for a paperback; it wants an ISBN attached to the title. You have two routes:
- Use your own ISBN, from Bowker or bought through IngramSpark itself. You are the publisher of record, and the same number travels with the book everywhere.
- Use one of IngramSpark's free ISBNs, if you qualify. This registers the edition under IngramSpark's imprint rather than yours, and if you later decide you want to own the ISBN, you have to set the book up again as a new title under the number you own.
IngramSpark also removed its old title setup fee, so uploading a new title there no longer carries the charge that older guides mention. For most authors who care about being their own publisher, the clean choice on IngramSpark is a Bowker ISBN you own.
Ebook versus print
A useful rule of thumb: ebooks almost never need an ISBN you buy, because every major ebook store either uses its own identifier or assigns one free. Print is where the question actually lives, and specifically it lives with IngramSpark. If you are only ever going to sell a Kindle ebook and a KDP paperback, you can publish without spending a cent on ISBNs.
One book can need several ISBNs
A point that surprises first-time authors: an ISBN identifies one edition in one format, so a single title sold as a paperback, a hardcover and an ebook is three editions and can carry three different ISBNs. If you sell the same paperback through two channels using two different free ISBNs, catalogues can treat it as two different books. This is the strongest practical argument for buying a block of your own numbers if you are publishing seriously: one ISBN per format, the same everywhere, so your book has one identity across every store and library system instead of a scattered handful.
What about the barcode?
A print book also needs a barcode on the back cover, which encodes the ISBN and, optionally, the price. It is separate from the ISBN itself but tied to it. The good news is that you rarely pay for it: KDP and the other print-on-demand services generate the barcode and place it automatically when they build the cover, so there is nothing to buy. Bowker will sell you a barcode as a standalone product, but for print-on-demand you almost never need one.
Two myths worth clearing up
First, an ISBN is not a copyright. You own the copyright in your book the moment you write it; an ISBN is only a retail identifier, and registering one grants you no legal protection you did not already have. Second, a free store-assigned ISBN does not mean the store owns your book. It does not. The store becomes the publisher of record for that edition, which is a cataloguing label, not a claim on your rights. You can leave whenever you like, and your book leaves with you.
How Pressborn handles this for you
Pressborn does not sell you an ISBN and does not pretend the question is simpler than it is. What it does is only ask you for one when a store you have actually selected requires it. Select KDP, Apple, Kobo, Google or Draft2Digital and Pressborn never raises the subject. Select IngramSpark and it asks for your ISBN at the point of building that package, and tells you where to buy one for your country if you do not have it yet. It will not nag a KDP-only author to buy an identifier that KDP would assign free, because telling someone to spend money they do not need to is worse than saying nothing.
If you are still mapping out the whole process, the step-by-step KDP guide shows where the ISBN choice sits in the wider flow, and the cost breakdown puts the ISBN fee next to everything else you might spend.