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ISBN Checker
Validate ISBN-10 & ISBN-13 book numbers
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About ISBN Checker
A comprehensive ISBN (International Standard Book Number) validator that verifies both ISBN-10 and ISBN-13 formats. Auto-detects the format, validates check digits using the modulus-11 (ISBN-10) or modulus-10 (ISBN-13) algorithm, converts between ISBN-10 and ISBN-13, and shows step-by-step calculation breakdowns. Handles hyphens and spaces gracefully. Essential for librarians, booksellers, publishers, and anyone cataloging books.
ISBN Checker Features
- ISBN-10 & ISBN-13
- Auto format detection
- Check digit validation
- ISBN-10 ↔ 13 conversion
- Step-by-step math
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