We have a feature that lets you insert an ISBN into your book.

After you create a book, you will see a "Book Tools" menu on the left. If you then click on "Book Info" and select "Optional ISBN", you will see where you can enter an ISBN. Then, after you click the blue "Update Book" button, when you next generate a version of your book, you will see the ISBN on a page near the beginning of the book.

Just to be clear, we do not require ISBNs.

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