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What is an ISBN?

ISBN = A numbering system for books

When you enter an ISBN number, our search engine will examine millions of ISBNs in our database to find a match.

Need help locating a hard-to-find book?

New, used books, out-of-print

We are constantly growing and updating our database to help you find the book you are looking for.

What does ISBN mean?

ISBN means International Standard Book Number

Our comprehensive database includes books published in countries all over the world.

How does it work?

Making the internet's best search engine for books

We are working hard to make our search engine the most accurate ISBN search engine available online.

New Search Tools

Now you can search by Subject, Author or Title

Instead of pasting the ISBN, you can easily find a book by entering the title, author or subject.

Can one book have 2 ISBNs?

Understanding how multiple ISBNs are used for a single book title

Here's an example of 1 book that has 2 different ISBN Numbers.

This is because there are 2 different book formats -- 1 is hardcover and 1 is paperback.

9780297609377 -- hardcover version

9781780229072 -- paperback version

Where Can I Get An ISBN?

I'm an author and I want to self-publish my book.

Where can authors get an ISBN number?

Self-publishing authors can get an inexpensive ISBN Number + Free ISBN barcode from

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