📚 ISBN Validator

📚 ISBN Input

{{ isbnValidation.valid ?'✅' : (isbnValidation.type ==='info' ?'ℹ️' :'⚠️') }} {{ isbnValidation.message }}
✅ {{ validIsbns.length }} valid ISBN(s)
⚠️ {{ invalidIsbns.length }} invalid ISBN(s)

⚙️ Validation Options

📋 Example ISBNs

{{ example.isbn }}
{{ example.description }}

📊 Validation Results

📚

No ISBNs validated yet

Enter an ISBN above to start validation

🔍

Validating ISBN information...

Input:
{{ result.input }}
{{ result.valid ?'✅ Valid ISBN' :'❌ Invalid ISBN' }}
📖 {{ result.type }}
Analysis:
Clean Format: {{ result.analysis.cleanIsbn }}
Group: {{ result.analysis.groupIdentifier }} ({{ result.analysis.groupName }})
Check Digit: {{ result.analysis.checkDigit }} ({{ result.analysis.checkDigitValid ?'Valid' :'Invalid' }})
Format Conversion:
ISBN-13: {{ result.conversion.isbn13 }}
ISBN-10: {{ result.conversion.isbn10 }}
Hyphenated: {{ result.conversion.hyphenated }}
Barcode (EAN-13): {{ result.conversion.barcode }}
Check Digit Calculation:
Method: {{ result.calculation.method }}
Calculation: {{ result.calculation.formula }}
Expected: {{ result.calculation.expected }}
Actual: {{ result.calculation.actual }}
⚠️ {{ warning }}
{{ new Date(result.timestamp).toLocaleTimeString() }}

📈 Session Statistics

Total Validated
{{ validationResults.length }}
Valid ISBNs
{{ validResultsCount }}
Invalid ISBNs
{{ invalidResultsCount }}
Success Rate
{{ Math.round(successRate) }}%

💾 Export Results

⚠️

ℹ️ About ISBN Validator

ISBN Validator checks International Standard Book Numbers used for books, ebooks, audiobooks, and other separately available monographic publications. It accepts plain or hyphenated ISBN-10 and ISBN-13 values, verifies the check digit, normalizes formatting, and shows whether a legacy ISBN-10 can be converted to an ISBN-13 barcode number.

ISBN formats and parts

The current ISBN system is defined by ISO 2108:2017 and administered by the International ISBN Agency. ISBNs identify a specific product form and edition, so a paperback, EPUB, PDF, and audiobook can each need a separate identifier even when the title is the same.

ISBN-13

  • Length: 13 digits, required for new ISBN assignments since 1 January 2007.
  • Prefix: 978 or 979, followed by registration group, registrant, publication element, and check digit.
  • Barcode use: compatible with EAN-13 / GTIN-13 retail barcode workflows.
  • Example: 978-0-306-40615-7.

ISBN-10

  • Length: 10 characters, used by older publications before the ISBN-13 transition.
  • Final character: check digit 0-9 or X, where X represents the value 10.
  • Conversion: most valid ISBN-10 values convert by prefixing 978 and recalculating the ISBN-13 check digit.
  • Example: 0-306-40615-2.

Check digit behavior

  • ISBN-10: validates when the weighted sum of all 10 characters, using weights 10 down to 1, is divisible by 11.
  • ISBN-13: calculates the final digit from the first 12 digits with alternating weights of 1 and 3 so the total is divisible by 10.
  • Hyphens and spaces: are presentation only; validation uses the numeric characters after cleanup.
  • Common errors caught: mistyped digits, missing check digits, copied hyphens in the wrong place, and ISBN-13 values that do not start with 978 or 979.

Practical examples

Input Result Why it matters
9780306406157 Valid ISBN-13 Normalize pasted catalog data to a readable hyphenated form.
0-306-40615-2 Valid ISBN-10 Check legacy records and generate the 978 ISBN-13 equivalent.
978-0-306-40615-8 Invalid check digit Find likely transcription errors before importing inventory.
9780471384298 ISBN-13 barcode value Matches the GS1-style conversion from ISBN-10 0471384291.

Useful validation workflows

  • Library and archive imports: validate ISBN columns before loading MARC, CSV, or spreadsheet records.
  • Publisher QA: confirm that title metadata, print files, and barcode artwork share the same identifier.
  • Bookstore inventory: catch malformed ISBNs in supplier feeds, marketplace listings, and point-of-sale exports.
  • Research and citations: normalize identifiers copied from catalogs, bibliographies, or scanned book covers.
  • Batch cleanup: separate valid and invalid rows before sending records to a cataloging or product information system.

Limitations to know

  • Mathematical validation is not assignment proof. A correct check digit does not prove that the ISBN exists, belongs to a publisher, or is assigned to the displayed title.
  • Hyphenation depends on current range data. Registration group and registrant ranges can change; authoritative segmentation comes from the International ISBN Agency range message.
  • ISBN-13 to ISBN-10 conversion is limited. 978-prefixed ISBN-13 values may have legacy ISBN-10 equivalents; 979-prefixed values generally do not.
  • ISBNs identify editions and formats, not abstract works. Different product forms can legitimately have different ISBNs for the same title.
  • No bibliographic lookup is performed. Use publisher, library, or ISBN agency records when you need title, author, or ownership verification.

Primary references

API Usage Example:

POST /api/tools/osint/isbn-validator
Content-Type: application/json

{
    "isbns": [
        "9780123456787",
        "0123456789",
        "978-0-321-12345-6"
    ],
    "options": {
        "includeFormatConversion": true,
        "showCheckDigitCalculation": true,
        "addHyphenation": true
    }
}
Ready