One of the questions I hear most from authors who want to publish: do I need an ISBN? The short answer is: it depends. The long answer — worth reading before you publish — is the one you'll find here.
What is an ISBN?
The ISBN is a unique 13-digit identifier assigned to each edition of a book. In Mexico it is administered by INDAUTOR (the National Copyright Institute). Each format — Kindle, paperback, hardcover — is a different edition and therefore carries a different ISBN.
An ISBN is not the same as copyright registration, and neither is the same as a registration certificate. These are independent procedures: the ISBN identifies the edition, the work registration protects the content, and the certificate is the proof INDAUTOR issues for each procedure.
An ISBN is not free in Mexico: INDAUTOR charges an official fee that varies by procedure (roughly $315 or $227 MXN per the 2026 fee schedule). That fee is updated periodically, so always confirm the current amount at indautor.gob.mx before starting your application.
What is the ISBN for?
- Uniquely identifies the book in any distribution system.
- Lets physical and digital bookstores add it to their catalog.
- Enables distribution through IngramSpark (access to Barnes & Noble, independent bookstores and libraries).
- Appears as a barcode on the back cover.
- It's needed to take part in book fairs with official registration.
- It gives professional identity as a formal publication.
Is it mandatory to publish on Amazon KDP?
No. Amazon has its own system: an ASIN for eBooks and a free ISBN for print. The real question isn't whether it's mandatory, but whether it suits your project in the long run.
Amazon's free ISBN vs. your own ISBN
When to use Amazon's free ISBN
- You only want to publish on Amazon.
- It's your first book and you're testing the market.
- You don't plan to distribute outside Amazon.
- You don't need your own imprint.
When you need your own ISBN
- You want to distribute via IngramSpark or physical bookstores.
- You plan to register your imprint.
- The book will take part in formal book fairs.
- You don't want it to read "Independently published".
- You'll publish a catalog of several titles.
If you use a free ISBN provided by KDP, the imprint appears as 'Independently published,' and that ISBN cannot be used outside KDP. If you want greater control over your imprint and ISBN portability across other distribution channels, using your own ISBN is preferable.
How to get an ISBN in Mexico with INDAUTOR
Register as a publisher
On the indautor.gob.mx portal, either as an individual or a company.
Request your publisher prefix
INDAUTOR assigns a unique prefix that identifies your imprint.
Request the ISBN for each title
You'll need the page count, the final title and the author's details. The procedure carries an official fee (check the current rate at INDAUTOR); it is not free.
Deposit the copies
Legal-deposit law requires delivering copies to the National Library, the Library of Congress and other institutions.
The full process can take 2 to 6 weeks. If you're in a hurry, publish with Amazon's free ISBN and apply for your own in parallel for future editions.
Comparison table: ISBN options for Mexican authors
| Criteria | Free Amazon ISBN | Own ISBN (INDAUTOR) |
|---|---|---|
| Cost | Free (covered by Amazon) | Official INDAUTOR fee (~$315 or $227 MXN by procedure, 2026) |
| Time | Instant | 2–6 weeks |
| Registered publisher | "Independently published" | Your name or imprint |
| Amazon distribution | ✓ | ✓ |
| IngramSpark / bookstores | ✗ | ✓ |
| Official book fairs | Limited | ✓ |
| Cross-platform portability | ✗ Amazon only | ✓ Universal |
Does an ISBN protect my book from plagiarism?
Not directly. The ISBN identifies; it doesn't protect. For that there's work registration with INDAUTOR, a separate procedure with its own fee that produces a registration certificate. In Mexico, copyright arises automatically the moment a work is created; registration and its certificate simply provide official, dated proof of that authorship.
Summary
- An ISBN is not mandatory for Amazon KDP.
- Kindle eBooks don't need an ISBN.
- Amazon's free ISBN is fine if you'll only sell on Amazon.
- Your own ISBN is needed for wider distribution and your own imprint.
- Your own ISBN via INDAUTOR carries an official fee (~$315 or $227 MXN by procedure, 2026) and can take 2–6 weeks — confirm the current fee before applying.
- ISBN ≠ copyright: they are separate procedures.
Have questions about the ISBN for your book?
At Crea Editores we handle the ISBN and the entire publishing process. Tell us about your project in a free consultation.
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Ángel Humberto Montiel Razo
A systems engineer turned publisher and author. He published "Quantum Physics for Kids" in 6 languages through Amazon KDP and now guides authors across Mexico and Latin America to publish professionally.