Credit Card Checker

A fast, client-side credit card checker for developers, QA, and auditors to validate numbers and identify issuer without transmitting data.

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About This Tool

The tool validates credit card numbers locally by normalizing input, performing a Luhn checksum, and identifying the issuer from standard IIN ranges. It does not contact payment networks or store sensitive data.
Conceptually, it treats the card number as a sequence of digits, applies a checksum, and uses prefix rules to map to Visa, MasterCard, American Express, and Discover. Length constraints are checked per issuer (Visa 13–19 digits, AmEx 15, MasterCard 16, Discover 16).
The tool outputs a structured result set suitable for tests and automation, including is_valid, issuer, luhn_valid, bin, masked_card, expiry_valid when provided, and normalized_number. It also provides a best-effort CVV_length suggestion and notes on potential inconsistencies.
Use cases include development QA, data generation for synthetic datasets, compliance validation, and audit scenarios where quick validation signals help verify formatting and issuer alignment without performing payments.

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How to Use

Provide inputs: card_number (required), expiry (optional), cvv (optional), name_on_card (optional).
The tool normalizes input by removing spaces and non-digit characters from the card_number.
It detects issuer and validates length and Luhn checksum.
If expiry is supplied, it parses MM/YY or MM/YYYY and checks against current date.
Review outputs: is_valid, issuer, luhn_valid, bin, masked_card, expiry_valid, and normalized_number.
Use results in testing pipelines or data generation.

Frequently Asked Questions

Find Quick Answers

What does this tool verify?

It checks that the card number conforms to digits, runs a Luhn checksum, identifies the issuer from standard prefixes, validates the length, and optionally validates expiry. It does not perform live authorization or store the PAN.

Is data transmitted to servers?

No. All validation is performed locally in the client. No card data is sent to any server or stored after the check.

Which card schemes are detected?

Common schemes are detected: Visa, MasterCard, American Express, and Discover, based on standard IIN prefixes and length rules. Unknown prefixes are labeled as Unknown with is_valid=false.

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