Data Validators
Validate credit card numbers using the Luhn algorithm and verify IBAN checksums. Essential validation tools for payment form testing.
Credit Card (Luhn)
IBAN Validator
What is This Tool?
A data validator checks the format and integrity of common data types including credit card numbers, IBANs, email addresses, and other structured identifiers. Paste or type any value and instantly verify whether it passes format validation, check digit algorithms, and structural rules.
Data validation is the first line of defense against bad data entering your systems. Client-side validation catches formatting errors immediately, reducing API calls and improving user experience. This tool validates using the same algorithms (Luhn, MOD 97, regex patterns) used in production systems.
Common Use Cases
Development & Debugging
Quickly check if a test credit card number, IBAN, or other identifier is correctly formatted before using it in your application.
QA Testing
Verify that your application's validation logic matches the correct algorithms by cross-checking against this independent validator.
Data Cleanup
Validate imported data from CSV files, databases, or API responses to identify and flag malformed records before processing.
Learning & Education
Understand how validation algorithms like Luhn and MOD 97 work by testing values and seeing detailed pass/fail results.
Frequently Asked Questions
What types of data can I validate?
Credit card numbers (Luhn), IBANs (MOD 97), email addresses (RFC 5321), URLs, phone numbers, SSNs, and other common data formats.
Does validation prove data is real?
No. Format validation confirms the data follows correct structural rules (length, characters, check digits) but does not verify it exists in any real database or registry.
What is the Luhn algorithm?
The Luhn algorithm (MOD 10 checksum) validates credit card numbers by doubling every other digit from right to left, summing all digits, and checking if the total is divisible by 10.