ISBNt

ISBNt, or International Standard Book Number Translator, is a tool designed to convert ISBN-10 numbers to ISBN-13 and vice versa. The International Standard Book Number (ISBN) is a unique numeric commercial book identifier. It is a 13-digit number used to identify books internationally. The first 12 digits are used to identify the title, and the 13th digit is a check digit used to verify the accuracy of the number.

ISBN-10, the older format, consists of 10 digits. The first three digits represent the country or language, the next group of digits represents the publisher, and the last digit is a check digit. ISBN-13, the newer format, consists of 13 digits. The first three digits are always 978 or 979, followed by the original ISBN-10 number without the check digit, and ending with a new check digit.

ISBNt simplifies the process of converting between these two formats. It uses a simple algorithm to calculate the check digit for the new format based on the digits of the original ISBN. This tool is particularly useful for librarians, bookstores, and publishers who need to maintain accurate records of books in both formats.

ISBNt is not a standard or official tool, but rather a practical solution for those who need to convert ISBNs frequently. It is available as a web-based application and can be used for free. However, it is important to note that while ISBNt can help with conversions, it should not be used as a substitute for official ISBN registration services.