Lisbn (pronounced "Lisbon") is a wrapper around String that adds methods for manipulating ISBNs.


Add this line to your application's Gemfile:

gem 'lisbn'

And then execute:

$ bundle

Or install it yourself as:

$ gem install lisbn


Instantiate a new Lisbn object:

> isbn ="9780000000002")

You can check its validity:

> isbn.valid?
 => true

You can convert it to ISBN-10 or ISBN-13:

> isbn.isbn10
 => "0000000000"

> isbn.isbn13
 => "9780000000002"

And you can break it up into its GS1 prefix, group identifier, prefix/publisher code, item number and check digit:

 => ["978", "0", "00", "000000", "2"]


You can update the ISBN ranges by replacing the RangeMessage.xml file with an updated copy from:

Then run:

> rake save_ranges_to_yaml


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Added some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request