Payment & cards

Validate a card number with the Luhn (mod-10) algorithm — runs locally in your browser.

Generate Luhn-valid test card numbers (Visa, Mastercard, Amex, Discover, JCB, Diners) — for development only.

Identify the card scheme (Visa, Mastercard, Amex, Discover, JCB, Diners, UnionPay) from a PAN.

Look up a card BIN (Bank Identification Number) to identify scheme, issuer, country and type.

Decode EMV / ISO 7816 BER-TLV hex into a labelled tree of tags, lengths and values.

Search the EMV / ISO 7816 tag dictionary by hex tag or by name fragment.

Decode an ISO 7813 Track 1 magstripe string into PAN, cardholder name, expiry and service code.

Decode an ISO 7813 Track 2 magstripe string into PAN, expiry, service code and discretionary data.

Generate an ISO 9564 PIN block (formats 0, 1 and 3) from a PIN and PAN — runs locally in your browser.

Compute the Key Check Value (KCV) of a single, double or triple length DES key by encrypting 8 bytes of zeros.

Look up a currency by ISO 4217 code (alpha or numeric) or by name fragment.

Look up a country by ISO 3166-1 alpha-2, alpha-3, numeric code, or by name fragment.

Look up an ISO 18245 Merchant Category Code by 4-digit code or by name fragment.

Validate an IBAN — checks the country format, length and ISO 13616 MOD-97 checksum.

Validate a SWIFT/BIC code format and break it down into bank, country, location and branch fields.

Look up a language by ISO 639-1 alpha-2, ISO 639-2/3 alpha-3, or by name fragment.

Format a card number for display — brand-aware grouping plus a masked version safe to show in receipts.

Compute the ISO 8583 field 52 encrypted PIN block from a PIN, PAN, BDK and KSN — full TDES DUKPT key derivation.