The question every new self-publisher asks: should I use Amazon KDP’s free ISBN, or buy my own from Bowker (the official ISBN agency in the US, via Myidentifiers)? Here’s my honest breakdown after doing it both ways.
Free KDP ISBN:
- Costs nothing
- BUT it’s tied to KDP/Amazon distribution, and Amazon is listed as the “publisher of record” / shows their info
- Fine if you ONLY ever distribute through KDP and don’t care about the publisher line
Your own ISBN (Bowker):
- You pay - and singles are pricey, but they sell blocks of 10 and 100 where the per-unit cost drops a lot
- YOU are the publisher of record, your imprint name shows
- The ISBN is portable - you can use it across IngramSpark, other retailers, bookstores, anywhere, not locked to one platform
- Looks more professional to the trade
My take: if you’re treating this as a real publishing business and going wide (which I do), buy your own and buy a block so the per-unit cost is sane. If you’re doing one Amazon-only title as an experiment, the free KDP one is genuinely fine. Don’t buy a single ISBN at full price though - that’s the worst value.
from the bookselling side i’ll just say - when i source from small publishers, the ones who own their ISBNs and have proper metadata are night and day easier to deal with in the catalog than the amazon-only freebie ones. cleaner records, show up properly everywhere. probably doesnt matter for a hobby title but if you want libraries and bookstores to find you, own your isbns.
Outsider (product seller) here but this rhymes with how product listings work too - each edition/format getting its own ISBN is just like each product variation needing its own barcode. The KDP-free vs your-own-imprint question is really about distribution reach and who shows as publisher of record, not about the barcode itself. Interesting how the identifier logic carries across both worlds.
@ScaleWithKev that parallel is spot on and I hadn’t framed it that way. Each distinct sellable thing - a format, an edition, a product variation - getting its own identifier really is a universal idea.
even though im not doing books this whole ISBN breakdown actually helped me get how identifiers work in general. same idea everywhere. thanks for explaining it so clearly rachel