A free ISBN is an ISBN-13 assigned at no cost by a publishing platform (such as KDP, IngramSpark, or Draft2Digital) instead of purchased directly from an ISBN agency. Free ISBNs save money but come with trade-offs: the platform controls the publisher-of-record name in industry databases, and the ISBN typically cannot be transferred if you move your book to a different distributor.
Who Offers Free ISBNs and What Are the Restrictions?
Several major self-publishing platforms provide free ISBNs, but each attaches different conditions to that offer. The restrictions centre on which name appears as the publisher, whether the ISBN can travel with your book, and which formats are covered.
Amazon KDP assigns a free ISBN to paperback and hardcover editions only. The publisher name in all industry metadata becomes “Independently published”; you cannot customise it. KDP does not offer free ISBNs for ebook editions (Kindle ebooks use Amazon’s proprietary ASIN identifier instead). The free KDP ISBN is registered to Amazon and cannot be used on any other platform.
IngramSpark offers a complimentary ISBN for both print and ebook editions through its dashboard. Books assigned this free ISBN appear under the imprint name “Indy Pub” in catalogue databases. Like KDP’s free option, the ISBN is tied to IngramSpark and cannot be transferred to another distributor.
Draft2Digital provides free ISBNs for both print and ebook editions. D2D is listed as the “vendor of record” in the ISBN registration, though this designation is not publicly visible on retail sites. The ISBN remains non-portable; if you leave D2D, you need a new one.
| Platform | Free ISBN formats | Publisher name shown | Portable? |
|---|---|---|---|
| Amazon KDP | “Independently published” | No | |
| IngramSpark | Print and ebook | “Indy Pub” | No |
| Draft2Digital | Print and ebook | D2D as vendor of record | No |
What Is “Publisher of Record” and Why Does It Matter?
The publisher of record is the entity listed as the publisher in the ISBN registration and, by extension, in every industry database that catalogues your book. This includes Bowker’s Books In Print (the US ISBN agency’s master catalogue), Nielsen BookData in the UK, library acquisition systems, and wholesale ordering platforms.
When you use a free ISBN from KDP, the publisher-of-record field reads “Independently published.” When you buy your own ISBN from Bowker or another national agency, you choose the publisher name yourself. Most authors who purchase ISBNs register them under their own imprint (a publishing business name they create), which appears in all metadata instead of the platform’s generic label.
For some authors, the distinction is cosmetic. Readers browsing Amazon rarely check who the publisher is. But for authors pursuing library placement, trade reviews, or bookstore consignment, the publisher name carries weight. Librarians and bookstore buyers use catalogue databases to evaluate titles, and a generic “Independently published” tag can signal that the book has not gone through a curated publishing process. Whether that perception is fair is debatable; that it exists is not.
How Much Does It Cost to Buy Your Own ISBN?
ISBN pricing varies dramatically by country because each nation designates its own ISBN agency. In some countries ISBNs are free; in others they cost over $100 each.
United States: Bowker is the sole US ISBN agency. A single ISBN costs $125. A pack of 10 costs $295 ($29.50 each), and a pack of 100 costs $575 ($5.75 each). The price drop at volume is steep; authors planning multiple titles or formats (paperback, hardcover, ebook, large print) benefit significantly from the 10-pack.
United Kingdom: Nielsen is the UK ISBN agency. A single ISBN costs £93, and a pack of 10 costs £174 (£17.40 each).
Canada: Library and Archives Canada issues ISBNs free of charge to Canadian publishers. Standard processing takes up to 30 working days, though the agency has reported longer wait times during periods of high demand. Canadian authors and small presses can request blocks of ISBNs at no cost, making Canada one of the most author-friendly jurisdictions for ISBN access.
Australia: Thorpe-Bowker (Bowker’s Australian affiliate) charges AUD $44 for a single ISBN and AUD $88 for a pack of 10.
Several other countries also provide ISBNs at no cost, including France (through the AFNIL agency), Brazil, and Croatia. The Alliance of Independent Authors (ALLi) maintains a regularly updated guide to international ISBN agencies and their pricing.
Wherever you buy, deal with your country’s official ISBN agency rather than a third-party reseller. Every country has exactly one official agency authorised to issue ISBNs, and the International ISBN Agency lists them all in its agency directory. A number of commercial websites resell ISBNs at a markup, and some are not connected to any national agency. The risk is not only the inflated price: an ISBN bought from an unofficial reseller is registered to that reseller, so its name (not yours or your imprint’s) appears as the publisher of record in the industry databases. That undoes the main reason most authors pay for their own ISBN in the first place.
Can You Move a Free ISBN to a Different Distributor?
No. A free ISBN issued by KDP, IngramSpark, or Draft2Digital is registered to that platform and cannot be transferred to another distributor. If you publish a paperback on KDP using its free ISBN and later decide to move that edition to IngramSpark, you will need a different ISBN for the IngramSpark listing. The KDP ISBN stays with KDP permanently.
This is the single biggest practical trade-off of free ISBNs. An ISBN you purchase from Bowker, Nielsen, or another national agency is yours. You can assign it to any platform, move it between distributors, or use it across multiple sales channels simultaneously. If you ever change how or where your book is distributed, a purchased ISBN follows the book; a free one does not.
Authors who publish on a single platform and have no plans to move may never feel this limitation. Authors who distribute widely (selling through both KDP and IngramSpark, or switching distributors as business needs change) will find that free ISBNs create lock-in. Each platform change requires a new ISBN, which means a new catalogue entry, a new barcode on the cover, and a break in the bibliographic record that links reviews, sales data, and library holdings to your title.
Do Ebooks Need ISBNs?
It depends on where you sell. Amazon Kindle does not require or use ISBNs for ebooks; every Kindle title receives an ASIN (Amazon Standard Identification Number) automatically. Apple Books, Kobo, and Google Play Books accept ISBNs for ebooks but do not require them. Draft2Digital will assign a free ISBN to your ebook if you want one.
The practical question is whether an ebook ISBN adds any value. For most indie authors selling primarily through online retailers, the answer is no. Retailers identify ebooks by their own internal IDs, and readers never search by ISBN. The main scenario where an ebook ISBN matters is library distribution: many library lending platforms (such as OverDrive) require an ISBN to catalogue and lend a digital title. If library ebook distribution is part of your plan, you will need an ISBN for that edition.
Each format of your book requires its own ISBN. A paperback, hardcover, ebook, large-print edition, and audiobook are each considered separate products under the ISBN system. A revised edition with substantial changes also requires a new ISBN. This is why the cost arithmetic matters: an author with a paperback, hardcover, and ebook edition needs three ISBNs per title if they choose to assign one to every format.
Does a Free ISBN Affect Bookstore Distribution?
A free ISBN does not technically prevent your book from appearing in any sales channel. KDP paperbacks with free ISBNs are listed on Amazon. IngramSpark titles with free ISBNs are available through Ingram’s distribution network, which supplies most independent bookstores and libraries.
The practical effect is subtler. When a bookstore buyer or librarian looks up your title in a catalogue database, they see the publisher-of-record name. “Independently published” (KDP’s free ISBN label) or “Indy Pub” (IngramSpark’s) signals that the book was self-published through a platform’s default channel. Some buyers filter or deprioritise titles with generic publisher names. Others do not care. The effect varies by store, by buyer, and by genre.
What a free ISBN cannot do is appear on a different platform. If your paperback’s free KDP ISBN is the only ISBN associated with that edition, the book cannot be listed through IngramSpark’s distribution network under that same ISBN. You would need a separate ISBN (either purchased or free from IngramSpark) to create an IngramSpark listing. This is the distribution constraint that catches authors off guard: the free ISBN is not just non-portable in theory; it actively limits which channels carry that specific edition.
There is also a perception gap worth noting. Some indie authors report that bookstore buyers treat “Independently published” as shorthand for “unvetted.” Whether you agree with that characterisation, the publisher-of-record field is visible in every wholesale ordering system a bookstore uses. An imprint name you chose yourself (registered through a purchased ISBN) at least signals intentionality, even if the book was produced by a single author working from a home office.
Your copyright page should list the ISBN for each edition, making it clear to readers and industry databases which identifier belongs to which format.
Frequently Asked Questions
Can you use the same ISBN for both a paperback and an ebook?
No. Each format of a book requires its own unique ISBN. A paperback, hardcover, ebook, large-print edition, and audiobook are each considered separate products. Using one ISBN across multiple formats violates ISBN standards and creates catalogue confusion for retailers and libraries.
What happens to reviews and sales rank if you change your ISBN?
On Amazon, reviews and sales rank are tied to the ASIN, not the ISBN. Changing your ISBN on Amazon does not affect your reviews. On other platforms and in library systems, the ISBN is the primary identifier; switching to a new ISBN creates a new catalogue entry, and any reviews, ratings, or lending history linked to the old ISBN do not carry over automatically.
Is the free KDP ISBN visible to readers on the Amazon listing?
Yes. The ISBN-13 appears in the “Product details” section of the Amazon listing page. The publisher name (“Independently published” for free KDP ISBNs) also appears there. Readers can see both, though most do not check the publisher field when making a purchase decision.
Can you set up your own imprint name with a purchased ISBN?
Yes. When you buy ISBNs from Bowker, Nielsen, or another national agency, you register a publisher name (your imprint) during the purchase process. That imprint name appears as the publisher of record in all industry databases. You can choose any business name you like; it does not need to be a registered company, though many authors create an LLC or sole proprietorship for their imprint.
Do you need separate ISBNs for KDP and IngramSpark editions of the same paperback?
If you use a free ISBN from either platform, yes. A free KDP ISBN cannot be used on IngramSpark, and vice versa. If you purchase your own ISBN from Bowker or another agency, you can use the same ISBN on both platforms for the same format, because you own the ISBN and control where it is assigned.
