--- title: "book:isbn · Meta Tag · zhead" canonical_url: "https://zhead.dev/meta/book-isbn" last_updated: "2026-08-19T02:35:56.485Z" meta: description: "Provides the book’s International Standard Book Number as a string." "og:description": "Provides the book’s International Standard Book Number as a string." "og:title": "book:isbn · Meta Tag · zhead" --- Open Graph metadata # book:isbn Provides the book’s International Standard Book Number as a string. ## Code examples Good example ``` ``` A valid ISBN-13 written without display separators. Good example ``` ``` A valid ISBN-10. Open Graph stores the value as a string and does not require ISBN-13. Avoid this example ``` ``` ISBN-13 check digits are numeric, so X makes this value invalid. ## Recommendations - 01 Use the Assigned ISBN Copy the identifier for the exact edition. Different formats and editions can have different ISBNs. - 02 Verify the ISBN Check the digits and checksum against the publisher or ISBN agency record. ## Related documentation - [Open Graph protocol](https://ogp.me/) - [isbn-international.org: 29](https://www.isbn-international.org/content/isbn-users-manual/29) ## Related meta tags ### [book:author](https://zhead.dev/meta/book-author) property Links a book to an author profile. The value is a URL, and you can repeat the property for multiple authors. ``` ``` Points to the author’s profile page. ### [book:isbn](https://zhead.dev/meta/book-isbn) property Provides the book’s International Standard Book Number as a string. ``` ``` A valid ISBN-13 written without display separators. ### [book:release\_date](https://zhead.dev/meta/book-release-date) property Records when a book was released. Open Graph defines the value as an ISO 8601 datetime. ``` ``` An ISO 8601 calendar date when no exact release time is needed. ### [book:tag](https://zhead.dev/meta/book-tag) property Adds a tag word or phrase associated with a book. Repeat the property to provide more than one tag. ``` ``` A clear genre for the book.