ISBN Barcode Guide
What the barcode on a book cover actually contains, how ISBN-10 and ISBN-13 relate, and what the small extra symbol beside it is for.
On this page
The short answer
The barcode on a book is a standard EAN-13 carrying the ISBN — often called a Bookland EAN. There is no special "ISBN barcode" symbology; retail scanners read it exactly like any other EAN-13.
From ISBN to barcode
An ISBN-13 is used directly as the EAN-13 number. An ISBN-10 is converted first: prefix 978, take the first nine digits, and calculate a new check digit with the GS1 modulo-10 method. The check character changes because ISBN-10 uses a modulo-11 checksum — which is also why an ISBN-10 can end in X and an ISBN-13 never can.
The 978 and 979 prefixes
978 was the original Bookland prefix. As it filled, 979 was added. Numbers issued under 979 have no ISBN-10 equivalent at all — ISBN-10 only ever covered the 978 range — so any tool that offers to convert one is inventing a number. Ours refuses and explains why.
Anatomy of an ISBN-13
| Part | What it identifies |
|---|---|
| Prefix (978 or 979) | The Bookland range |
| Registration group | Country, area or language group |
| Registrant | The publisher |
| Publication | The specific title and edition |
| Check digit | GS1 modulo-10 checksum |
The hyphens you see printed mark those boundaries. They vary in position because the group and registrant fields vary in length, which is why hyphenation cannot be derived by a simple rule — and why a barcode never contains them.
That small symbol beside the main one
Many covers carry a five-digit add-on to the right of the main barcode. In the US market it usually encodes a price: a leading 5 means US dollars, followed by the price in cents, so 51999 means $19.99. A value of 90000 means "no price given". Add-ons are a separate symbol with their own specification, and this site does not generate them — your printer or distributor can place one if your market requires it.
Getting an ISBN at all
ISBNs are issued by national ISBN agencies, which differ by country, and the number must be registered against your specific title, format and edition. A hardback, a paperback and an ebook of the same book each need their own ISBN. Generating the barcode image does not register anything.
Printing on a cover
- Print near nominal size and never scale the width independently of the height.
- Keep the white quiet zone on both sides — the left one is easy to lose against a dark cover.
- Solid dark bars on a light background; no gradients, no photographs behind the symbol.
- Gloss lamination scatters light. Test the finished cover, not the proof.
Tools
ISBN barcode generator · check an ISBN · ISSN barcodes for periodicals
Sources
ISBN structure and check-digit rules are defined in ISO 2108 and documented by the International ISBN Agency (isbn-international.org). The EAN-13 symbol itself is specified in the GS1 General Specifications.