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ISBN Validator

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Validate ISBN-10 and ISBN-13, then convert between them when the number is valid.

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Client-Side
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Hyphens and spaces are ignored. Converts 10 ↔ 13 when valid (978 prefix).

Result

ISBN-13
Valid
Cleaned9780306406157
ISBN-100306406152
ISBN-139780306406157

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<iframe
  src="https://tools.town/embed/isbn-validator/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="ISBN Validator">
</iframe>

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How to Use

  1. 1 Paste ISBN-10 or ISBN-13
  2. 2 Hyphens are ignored
  3. 3 Read validity and the other format when convertible

Features

  • ISBN-10 + ISBN-13
  • X check digit
  • 978 conversion
  • Client-side

Why it Matters

Catalogers and developers need a quick ISBN checksum without a library lookup API.

★★★★★

Checksum validation and 10↔13 conversion for the 978 Bookland prefix. No remote metadata lookup.

Frequently Asked Questions

979 prefix?
Validated as ISBN-13; conversion to ISBN-10 only works for 978.
Does valid mean the book exists?
No — checksum only.
Metadata lookup?
Not in this free tool — validation and conversion only.
📖

Want to understand the math?

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Check an ISBN and Convert 10 ↔
isbn

Check an ISBN and Convert 10 ↔ 13

Validate a book ISBN and convert between ISBN-10 and ISBN-13 when the checksum passes.

16 Aug 2026

5 min read

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