Check digits / Books
ISBN Converter: ISBN-10 to ISBN-13 and Back, with Check Digit
Convert a book's ISBN-10 to ISBN-13 or back, check that the check digit is right, and get the EAN-13 barcode as SVG for the cover.
ISBN Converter: ISBN-10 to ISBN-13 and Back, with Check Digit: ISBN-10 weights its ten digits 10, 9, … 1 and the total must divide by 11; X stands for 10. ISBN-13 is 978 plus the first nine digits, with a new check digit from weights 1 and 3: 0-306-40615-2 becomes 978-0-306-40615-7. An ISBN-13 starting with 979 has no ISBN-10. Runs 100% locally in your browser with zero server file uploads.
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EAN-13 barcode
ISBN-10 weights its digits 10 down to 1 and must add up to a multiple of 11, with X standing for a check value of 10. ISBN-13 is the book's EAN-13 barcode number: 978 in front of the first nine digits of the ISBN-10, with a new check digit from alternate weights of 1 and 3. Books numbered from 2007 on may start with 979, which has no ISBN-10 form. The tool checks the arithmetic only; it does not look the book up.
The 2007 change
Since 1 January 2007 books carry 13-digit ISBNs, matching the EAN-13 product codes used by shops. Every older ISBN-10 converts by adding 978; the 979 prefix opened new number ranges, so those books never had an ISBN-10.
Hyphens
The hyphens split the ISBN into the prefix, the registration group (a language or country area), the publisher, and the title, and their positions vary; the tool ignores them. To cite a book, the citation generator formats the ISBN with the rest of the reference.
How to use it
- Paste an ISBN-10 or ISBN-13, with or without hyphens.
- Read whether the check digit is right.
- Copy the other form, or the barcode.
Privacy & limitations
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Related tools
Frequently asked questions
Why do some ISBNs end in X?
The ISBN-10 check digit can be 10, written as the Roman numeral X, so that every check value fits in one character.
Is ISBN-13 the barcode number?
Yes: it is the EAN-13 number printed under a book's barcode, which the tool draws for you.
Can I get an ISBN here?
No: ISBNs are issued by your country's ISBN agency. This tool only converts and checks them.
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