Do you really need an ISBN?
If you consider your book project as a commercial venture, your book sales may benefit from having an International Standard Book Number (ISBN). Bookshops will usually only stock books with an ISBN barcode on the back cover. An ISBN may be obtained from the ISBN Agency.
The ISBN Agency also offers to sell you a barcode for your ISBN, however we will generate a barcode for free, so there is no need for you to purchase one.
The information you submit for your book when registering an ISBN is entered into a worldwide book database. This information enables anyone who’s looking for your book in the database to get in contact with you — provided the ISBN data is up to date, i.e. if you change address, you should notify the ISBN Agency so they can update your book’s data.
An ISBN is not required if you only print a very limited edition, for instance to give away to your family members.