--- title: "Do You Need an ISBN for an Ebook on KDP?" description: "What KDP says about ISBNs: none needed for an ebook, a free KDP ISBN or your own for paperbacks, what the imprint shows, and where KDP's pages go quiet." url: "https://www.superebook.ai/guides/do-you-need-an-isbn-for-an-ebook" published: "2026-10-20" updated: "2026-10-20" --- # Do You Need an ISBN for an Ebook on KDP? On KDP, an ebook does not need an ISBN, but a paperback usually does. Here is what KDP's help pages say about each, the two ISBN options, and what a free ISBN does to your publisher name. By Shri and Sarath · Published October 20, 2026 · 5 min read Every KDP fact below comes from KDP's own help pages, read on 2026-10-20. This guide covers KDP only. Other stores set their own identifier rules, so check each one's pages. KDP changes its rules, so confirm on the linked pages before you publish. ## Ebooks: no ISBN needed on KDP KDP's Get an ISBN page says plainly: "You don't need an ISBN for eBooks on KDP." Its page on what an ISBN is says "eBooks and low-content books are the only formats where an ISBN is optional." The metadata guidelines agree: "you do not need an ISBN to publish an eBook, but you need an ISBN to publish a paperback or hardcover (except for low-content books)." KDP also says free ISBNs "are only available for paperback and hardcover books." So for an ebook the choice is not between a free ISBN and your own: KDP simply doesn't assign one. KDP's ISBN pages that we read don't mention the ASIN, Amazon's own product identifier, and they don't say what identifies an ebook on the Amazon site. Don't assume details KDP's pages don't give. If you do buy an ISBN for an ebook, KDP's pages we read say nothing for or against it. The same applies when the ebook is sold somewhere other than KDP: the identifier rules there belong to that store. ## Paperbacks and hardcovers: the two options KDP says an ISBN is "a unique identifier for books" that helps bookstores, libraries, distributors and readers find and reference your book. Each format of your book, paperback versus hardcover, needs its own ISBN, and the same ISBN cannot be reused across formats or across new editions that change significantly from the original. | | Free KDP ISBN | Your own ISBN | | --- | --- | --- | | Cost | Free | You cover the cost of the ISBN | | Where you can publish | Only with KDP | Outside KDP too | | Imprint (publisher name) | "Independently published" | The imprint you register and enter | | Requirements | None from you, KDP registers it | Details in KDP must match the ISBN agency's record exactly | | Formats | Paperback and hardcover | Paperback and hardcover (ebooks don't need one) | KDP's summary of the two ISBN options, paraphrased KDP says a free ISBN is registered with Bowker, the US ISBN agency, using your book details. Free ISBNs can only be used on KDP and cannot be used to publish outside KDP. To get one, open the book's content page on your Bookshelf, find the ISBN section, choose Get free KDP ISBN, then Assign ISBN. ## Imprint: the part people overlook KDP defines an imprint as "the name of the publisher associated with your book's ISBN." With your own ISBN you can list your own publishing imprint, such as a business or brand name. With a free KDP ISBN, the imprint shows as "Independently published." That is a trade: the free ISBN costs nothing but you cannot brand it. With your own ISBN, KDP checks that your imprint matches what is on file with the ISBN agency, and if there is a mismatch you won't be able to publish. KDP says entries are case-sensitive, that even extra spaces at the end of the imprint can cause a mismatch, that you must not enter placeholders such as "unknown" or "n/a," and that the field is limited to 100 characters. It recommends copying and pasting directly from the agency's record. The title and author name you enter must match the ones you registered the ISBN with too. ISBN agencies differ by country. KDP's pages name Bowker as the US agency, and speak of Bowker "or local ISBN agency" for other places. KDP's pages say Bowker offers discounted rates for KDP authors, but we don't quote any price here because prices are the agency's to state and change. Check your country's agency for its current terms. ## Low-content books and an ISBN For low-content books such as notebooks and planners, KDP says an ISBN is optional, and low-content books are not eligible for the free KDP ISBN. You can use your own ISBN or publish without one. Our [guide to KDP's low-content book rules](https://www.superebook.ai/guides/kdp-low-content-books.md) covers what else changes without an ISBN. ## Changing an ISBN, fixing errors and barcodes KDP's page on changing an ISBN says: "ISBNs cannot be changed if your book is published." To update the ISBN, or details such as the title or author name, you have to unpublish the book and publish a new edition, created the way you made the first one. An ISBN can be updated while the book is still in draft, from the ISBN section of the content page. If you change your own ISBN's details with the agency, KDP says it takes 5 business days to register the change, and you should wait before updating the book on KDP. If KDP shows "Please fix the highlighted issue" with nothing highlighted, KDP says that typically means a problem with your ISBN or imprint. It names two causes: a spelling, spacing or punctuation mistake, or a title, author name or imprint that doesn't match the agency's record. The fix it gives is to check the agency's website and copy from it. KDP adds that for questions about ISBN metadata you need to contact the agency, in its example Bowker. Barcodes are separate from the ISBN itself. KDP's barcode page says you can upload a cover with or without a barcode, and that if you use Cover Creator or provide none, KDP places one on the back cover. If you provide your own and it includes an ISBN, the ISBN must be valid and match your book's ISBN exactly. KDP says a cover with images or text in the barcode location will be rejected. KDP recommends an Amazon-placed barcode when yours fails validation. KDP's barcode page doesn't say what an ebook cover needs, since an ebook has no printed barcode. > **Does ISBN choice affect distribution?** KDP's Expanded Distribution page says a paperback's ISBN must not have been submitted for distribution through another service. See [what KDP Expanded Distribution is](https://www.superebook.ai/guides/kdp-expanded-distribution.md) for the other requirements. **ISBN checklist** - [ ] Ebook only: you can publish on KDP without an ISBN. - [ ] Paperback or hardcover: decide between the free KDP ISBN and your own before you upload. - [ ] Want your own publisher name shown? That needs your own ISBN. - [ ] Plan to sell the paperback outside KDP? A free KDP ISBN can't be used there. - [ ] With your own ISBN, copy the title, author and imprint from the agency's record, spaces and capitals included. - [ ] Use a separate ISBN for each format, and for a significantly changed edition. - [ ] Low-content book: the free ISBN isn't available, so pick your own ISBN or none. ## Questions **Do I need an ISBN to publish an ebook on Amazon through KDP?** No. KDP's Get an ISBN page says you don't need an ISBN for eBooks on KDP. **Can I get a free ISBN for my ebook?** KDP says free ISBNs are only available for paperback and hardcover books, so there is no free ISBN for an ebook. **What publisher name does a free KDP ISBN show?** KDP says the imprint will appear as "Independently published." To show your own publisher name you need your own ISBN. **Can I use the same ISBN for the paperback and the hardcover?** No. KDP says each format needs its own ISBN, and the same ISBN cannot be reused across formats or significantly changed editions. **Where do I buy my own ISBN?** From your country's ISBN agency. KDP's pages name Bowker for the US and mention local agencies elsewhere. We don't quote prices, since those are the agency's to set. ## Sources Facts checked on October 20, 2026. - [KDP: What is an ISBN and Imprint?](https://kdp.amazon.com/en_US/help/topic/G201834170): ISBN definition, ebooks and low-content books as the only formats where it is optional, two options, one ISBN per format, imprint definition, the "Independently published" imprint, matching rules and the 100-character limit. - [KDP: Get an ISBN](https://kdp.amazon.com/en_US/help/topic/GTJ8LBXL6Z4WV5QX): No ISBN needed for ebooks, free ISBN only for print and registered with Bowker, the steps, own-ISBN steps, the options summary table, and the low-content exclusion. - [KDP: Metadata Guidelines for Books](https://kdp.amazon.com/en_US/help/topic/G201097560): The ISBN section: no ISBN for ebooks, ISBN needed for paperback and hardcover except low-content books, and that an ISBN in the manuscript must match the one entered. - [KDP: Low-Content Books](https://kdp.amazon.com/en_US/help/topic/GGE5T76TWKA85DJM): ISBN optional for low-content books, not eligible for the free KDP ISBN, the ISBN selection cannot be changed after publishing. - [KDP: Change or view your ISBN](https://kdp.amazon.com/en_US/help/topic/G8BYTM8CVK74676V): ISBNs can't be changed once published, the unpublish-and-new-edition route, draft changes and the 5 business day wait after changing agency details. - [KDP: Troubleshoot ISBN errors](https://kdp.amazon.com/en_US/help/topic/GRBXANE8Q9P9V2FL): The "Please fix the highlighted issue" error, its two causes and the copy-from-the-agency fix. - [KDP: Barcodes](https://kdp.amazon.com/en_US/help/topic/G5HDYGP4BXLX4RUW): Cover with or without a barcode, KDP-placed barcodes, the ISBN match requirement and rejection for content in the barcode area. - [KDP: Expanded Distribution](https://kdp.amazon.com/en_US/help/topic/GQTT4W3T5AYK7L45): The requirement that the ISBN has not been submitted for distribution through another service. ## Related - [KDP book generator](https://www.superebook.ai/kdp-book-generator.md) - [PDF ebook maker](https://www.superebook.ai/ai-pdf-ebook-maker.md)