ISBN and Copyright Guidance for Ebook Authors

Quick Answer: You don't need an ISBN for an ebook sold on Amazon (Kindle uses ASINs instead). You do need one for library distribution and some international retailers. Copyright protection is automatic the moment you write your book; registration with the US Copyright Office ($65 online) adds legal protections that matter if someone copies your work.

ISBN and copyright are two of the most frequently misunderstood topics in self-publishing. Authors either over-invest (buying ISBNs they don't need) or under-invest (skipping copyright registration that would protect them). This article clarifies what each does and when each matters.

ISBN: When You Need One and When You Don't

An ISBN (International Standard Book Number) is a 13-digit identifier used by bookstores, libraries, and distributors to catalog and track books. Each format of a book (ebook, paperback, hardcover, audiobook) requires its own ISBN.

Amazon KDP does not require an ISBN for ebooks. Kindle ebooks receive an ASIN (Amazon Standard Identification Number) automatically. You cannot use your own ISBN on Kindle ebooks even if you have one.

Apple Books, Kobo, and Google Play accept ebooks without ISBNs but assign their own internal identifiers. Having an ISBN is recommended for professional appearance and for distribution through partners, but it's not technically required on these platforms.

Library distribution requires an ISBN. OverDrive and other library lending platforms use ISBNs to catalog digital titles. If getting your ebook into libraries is part of your strategy, you need an ISBN for the ebook edition.

Print books should always have an ISBN. Amazon KDP offers a free ISBN for paperback and hardcover editions, but the publisher name in industry databases will be listed as "Independently published." If you want your own imprint name as the publisher of record, you need to purchase your own ISBN.

Where to buy ISBNs in the US. Bowker (myidentifiers.com) is the sole official ISBN agency in the United States. Pricing as of 2026: $125 for a single ISBN, $295 for a block of 10 ($29.50 each), and $575 for a block of 100 ($5.75 each). If you plan to publish more than one or two books, the 10-pack is the practical choice. In the UK, ISBNs are issued by Nielsen; in Canada, they're free through Library and Archives Canada.

Free ISBNs from platforms. Amazon KDP (print only), Draft2Digital (ebook), and IngramSpark (sometimes promotional) offer free ISBNs. The trade-off: the platform is listed as the publisher of record in industry databases, and the ISBN can only be used on that platform.

Copyright: What It Protects and How to Register

Copyright is automatic. In the US and most countries, your ebook is protected by copyright the moment you create it. You don't need to register, file paperwork, or add a copyright notice for the protection to exist. The "©" symbol is customary but not legally required.

Registration adds enforcement power. Registering your copyright with the US Copyright Office ($65 for online registration) gives you the ability to sue for infringement in federal court and to claim statutory damages and attorney's fees. Without registration, you can still claim copyright, but your legal remedies are limited to actual damages, which are often too small to justify the cost of litigation.

When to register. Register before publication or within three months of publication to preserve your right to statutory damages. If you're investing significant time and money in your ebook and want the strongest legal protection, registration is worth the $65.

How to register. Go to copyright.gov, create an account, fill out the application (selecting "literary work" for an ebook), upload a copy of your manuscript, and pay the $65 fee. Processing takes several months, but the protection dates back to the filing date.

What copyright doesn't protect. Copyright protects the specific expression of ideas, not the ideas themselves. Your book about productivity is protected. The concept of writing about productivity is not. Titles cannot be copyrighted. Short phrases, slogans, and common expressions cannot be copyrighted.

What Good ISBN and Copyright Practice Looks Like vs What Does Not

Works well: - The author buys a block of ISBNs from Bowker for print editions and uses their own imprint name as the publisher of record. - The ebook is published on Amazon without an ISBN (using the automatically assigned ASIN) and on other platforms with an ISBN where needed. - The copyright is registered with the US Copyright Office within three months of publication.

Red flags: - The author buys ISBNs for ebook editions that will only be sold on Amazon, where ISBNs aren't used. This is money spent on something that serves no purpose. - The author assumes copyright registration is unnecessary because "everything is automatically copyrighted." Automatic protection exists, but registration adds enforcement tools that matter if infringement occurs. - The author uses a free ISBN from one platform and then tries to reuse it on a different platform. Free ISBNs are tied to the issuing platform and cannot be transferred.

The Takeaway

For most self-published ebook authors, the practical approach is: skip the ISBN for Kindle ebooks (use the ASIN), get ISBNs for print editions and for ebook editions you want in libraries, and register your copyright online for $65 within three months of publication. These steps take under an hour and cost under $200 total for a single book. For the full publishing process, see the Ebook Publishing and Distribution guide.

Q: Do you need an ISBN for your ebook? A: Not for Amazon (which uses ASINs). ISBNs are needed for library distribution and recommended for some international retailers. See Do You Need an ISBN for Your Ebook? for a full breakdown.

Q: How do you copyright an ebook? A: Copyright is automatic upon creation. For stronger legal protection, register with the US Copyright Office at copyright.gov ($65 online). See How Do You Copyright an Ebook?

Q: How much do ISBNs cost? A: In the US, Bowker charges $125 for one ISBN, $295 for 10, or $575 for 100. Free ISBNs are available from Amazon KDP (print only) and Draft2Digital (ebook), but the platform is listed as your publisher of record.