Free retailer ISBNs vs International ISBN Agency
Free retailer ISBNs (e.g., from KDP, Lulu, D2D) are free but tied to the retailer's imprint, meaning you cannot use them elsewhere and the publisher listed will be the retailer, not you. In contrast, purchasing an ISBN through a country-specific agency (via the International ISBN Agency directory) gives you full ownership and control over the ISBN, allowing you to list yourself as publisher and distribute across any channel. Pricing for agency ISBNs varies by country, often costing money, while retailer ISBNs are free. The choice hinges on whether you prioritize cost savings and simplicity within one platform versus long-term flexibility and professional branding across multiple retailers.
Pick Free retailer ISBNs
Pick Free retailer ISBNs if you are distributing exclusively through that retailer (e.g., only Amazon KDP) and do not plan to sell your book elsewhere or mind having the retailer listed as publisher.
Pick International ISBN Agency
Pick International ISBN Agency if you want to own your ISBN, list yourself as publisher, and have the freedom to distribute your book through any retailer or channel without imprint restrictions.
At a glance
| Free retailer ISBNs | International ISBN Agency | |
|---|---|---|
| Pricing | Free | Varies by country |
| Pricing model | Free | Paid |
| Free option | Yes | No |
| Platforms | Web | Web |
| Best for | ISBN & Metadata | ISBN & Metadata |
| AI features | No | No |
| Open source | No | No |
Free retailer ISBNs
kdp.amazon.com / lulu.com
KDP/Lulu/D2D provide free ISBNs (tied to their imprint).
International ISBN Agency
isbn-international.org
Directory of country-specific ISBN agencies.
Visit International ISBN Agency ↗See more options: Free retailer ISBNs alternatives · International ISBN Agency alternatives