What is the Luhn algorithm and how does it validate credit cards?

The Luhn algorithm (also known as mod 10) is a checksum formula used to validate credit card numbers, IMEI numbers, and other identification numbers. It works by doubling every second digit from right to left, summing all digits, and checking if the total is divisible by 10. This catches most typing errors and simple fraud attempts.

Can I validate ISBN-10 and ISBN-13 codes?

Yes! Our free validator supports both ISBN-10 and ISBN-13 formats, as well as EAN-13 codes. Simply enter the code with or without hyphens, and the tool will automatically detect the format and validate it using the appropriate algorithm.

What information does the VIN validator provide?

The VIN (Vehicle Identification Number) validator checks the 17-character code for validity, verifies the check digit, and provides information about the manufacturer's country of origin, the vehicle's make, and the model year when possible.

Is my data secure when using this validator?

Absolutely! All validation happens directly in your browser using JavaScript. No data is sent to any server, ensuring complete privacy. Your codes are never stored, transmitted, or logged anywhere.

What are DAMM and Verhoeff algorithms used for?

DAMM and Verhoeff are advanced check digit algorithms that detect all single-digit errors and most transposition errors (when two digits are swapped). They're used in various identification systems where high accuracy is required, such as national ID numbers and pharmaceutical codes.

Universal Code Validator - Validate Credit Cards, ISBN, IBAN, VIN & More

Luhn Algorithm Validator

The Luhn algorithm (mod 10) is used to validate credit card numbers, debit cards, and other identification numbers. It detects single-digit errors and most transposition errors.

Use cases: Credit cards (Visa, Mastercard, Amex, Discover), IMEI numbers, Social Insurance Numbers (Canada), and more.

Enter Card Number:

Test Examples (Valid):

4532015112830366 5425233430109903 378282246310005 6011111111111117

ISBN/EAN Validator

International Standard Book Numbers (ISBN) and European Article Numbers (EAN) use check digits to validate product identifiers. Supports ISBN-10, ISBN-13, and EAN-13 formats.

Use cases: Book identification, product barcodes, retail merchandise tracking.

Enter ISBN/EAN Code:

Test Examples (Valid):

978-0-306-40615-7 0-306-40615-2 9780136091813

IBAN Validator

International Bank Account Numbers (IBAN) are used to identify bank accounts across international borders. Each IBAN includes a check digit calculated using mod-97 algorithm.

Use cases: International wire transfers, SEPA payments, cross-border banking.

Enter IBAN:

Test Examples (Valid):

GB82 WEST 1234 5698 7654 32 DE89370400440532013000 FR1420041010050500013M02606

VIN Validator

Vehicle Identification Numbers (VIN) are 17-character codes that uniquely identify motor vehicles. The 9th character is a check digit calculated using a weighted algorithm.

Use cases: Vehicle registration, insurance claims, automotive sales, theft prevention.

Enter VIN:

Test Examples (Valid):

1HGBH41JXMN109186 JH4NA1157MT001832 1M8GDM9AXKP042788

DAMM Algorithm Validator

The DAMM algorithm is a check digit algorithm that detects all single-digit errors and all adjacent transposition errors. It uses a specially constructed quasigroup table.

Use cases: Pharmaceutical codes, national ID numbers, custom identification systems requiring high accuracy.

Enter Number with Check Digit:

Test Examples (Valid):

5724 112946 8739567

Verhoeff Algorithm Validator

The Verhoeff algorithm is a complex check digit calculation that detects all single-digit errors and all transposition errors. It uses dihedral group D5 and permutation tables.

Use cases: German tax ID numbers, national identification systems, high-security identification codes.

Enter Number with Check Digit:

Test Examples (Valid):

2363 1428570 123451

🔍 Universal Code Validator Suite

What is the Code Validator?

Luhn Algorithm Validator

Test Examples (Valid):

ISBN/EAN Validator

Test Examples (Valid):

IBAN Validator

Test Examples (Valid):

VIN Validator

Test Examples (Valid):

DAMM Algorithm Validator

Test Examples (Valid):

Verhoeff Algorithm Validator

Test Examples (Valid):