Dev4Bits PT-BR

Fictitious Credit Card Generator

Generate a synthetic card number, future expiration date and CVV to test forms and interfaces locally in your browser.

Generate synthetic card data

For interface tests only. Passing Luhn does not guarantee that a card exists, has been issued or can authorize a payment. For transactions, use your provider’s official sandbox cards.

Generated locally. This tool does not transmit or store the generated data.

How are the fields generated?

The selected network supplies the documented prefix and number length. Random digits come from crypto.getRandomValues, and the last digit is calculated with Luhn. Expiration is 1 to 60 months in the future, based on your device’s calendar. The CVV is an independent synthetic string: four digits for American Express and three for the other networks, keeping leading zeros.

Which formats are supported?

  • Visa: prefix 4; 13, 16 or 19 digits.
  • Mastercard: prefixes 51–55 or 222100–272099; 16 digits.
  • American Express: prefixes 34 or 37; 15 digits.
  • Elo: prefix 506699; 16 digits.
  • Hipercard: prefix 606282; 16 digits.
  • Discover: prefixes 6011, 622126–622925, 644–649 or 65; 16 or 19 digits.
  • Diners Club: prefixes 300000–305999, 309500–309599, 360000–369999 or 380000–399999; 14 digits.
  • JCB: prefixes 3528–3589; 16 to 19 digits.

Can I test payments with these values?

Use these synthetic values for form validation and layout tests. Luhn is a checksum, not proof of existence, issuance or payment authorization. Generated numbers are not reserved test accounts and may coincide with issued numbers. The CVV is random and is not an issuer-generated security code.

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