ISBN Guide for Self-Publishers

Everything you need to know about ISBNs, ASINs, and when you actually need them

What is an ISBN?

ISBN stands for International Standard Book Number. It's a unique 13-digit identifier assigned to every published book.

Example: 978-0-06-112008-4

Each format (paperback, hardcover, ebook) needs its own ISBN

ISBN vs ASIN

ISBN

  • Universal (works everywhere)
  • Required for print books
  • Needed for bookstores & libraries
  • You own it forever

ASIN

  • Amazon-only identifier
  • Automatically assigned by Amazon
  • For Kindle ebooks (no ISBN needed)
  • Amazon owns it, not you

When You NEED an ISBN

  • Print Books (Paperback/Hardcover)

    Required for all print formats on Amazon KDP and other platforms

  • Selling in Bookstores & Libraries

    Physical retailers require ISBNs for inventory management

  • Expanded Distribution

    If you want your book available beyond Amazon

  • Professional Credibility

    Makes your book look legitimate and professionally published

When You DON'T Need an ISBN

  • Kindle Ebooks (Amazon Only)

    Amazon assigns an ASIN automatically - no ISBN required

  • Amazon-Exclusive Print Books

    KDP provides free ISBNs if you're only selling on Amazon

  • Free Lead Magnets

    PDFs for email list building don't need ISBNs

How to Get an ISBN

Option 1: Free from Amazon KDP (Recommended for Beginners)

Amazon provides free ISBNs for print books. However, Amazon will be listed as the publisher.

  • ✓ Completely free
  • ✓ Instant assignment
  • ✗ Amazon listed as publisher
  • ✗ Can't use for other platforms

Option 2: Buy Your Own (Recommended for Serious Authors)

Purchase from Bowker (US) or your country's ISBN agency. You'll be listed as the publisher.

  • ✓ You own the ISBN
  • ✓ Your name as publisher
  • ✓ Use on any platform
  • ✗ Costs money ($125+ in US)

Need a Barcode for Your Book Cover?

Once you have your ISBN, generate a professional barcode for your back cover in seconds!

Generate ISBN Barcode

Quick Reference

FormatISBN Needed?Notes
Kindle Ebook NoAmazon assigns ASIN
Paperback (KDP) YesFree from KDP or buy your own
Hardcover (KDP) YesFree from KDP or buy your own
IngramSpark Print YesMust buy your own
Draft2Digital Ebook OptionalRecommended for wide distribution