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ISBN Validator

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Validate ISBN-10 and ISBN-13 book numbers by verifying the check digit, and convert between the two formats. Paste a list to validate many at once. Free, private.

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Privacy & Security

All processing happens locally in your browser — nothing is uploaded.

check_circle Data: None
check_circle Client-side-Side
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update v1.0
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How to Use

Paste one or more ISBNs (one per line). Each is validated and converted if possible.

Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.

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