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credit-card-generator

A credit card number generator produces card numbers that pass the Luhn checksum and follow major issuer prefix rules (Visa, Mastercard, Amex, Discover, JCB, Diners Club) — strictly for software testing, fraud-detection rule development, and form-validation work. The ZTools Credit Card Generator emits cards with valid prefixes, valid lengths, valid Luhn check digits, plausible CVV, and configurable expiry dates so QA engineers can exercise their payment forms end-to-end without hitting real PSPs. These numbers are NOT linked to any real account, will NEVER process a charge, and exist purely for offline validation testing.

Use cases​

Payment-form QA​

Manual testers exercise the checkout form with Luhn-valid numbers across all card brands. Backend logs show how the validator parsed each one.

Fraud-rule development​

Anti-fraud team writes BIN-prefix rules. Generate batches per issuer to exercise the matcher against synthetic but plausible inputs.

Frontend tutorials​

Course screencasts show payment-form validation. Use synthetic Luhn-valid numbers so the demo passes the validator without exposing a real card.

Stripe / Adyen test mode integration​

Most PSPs publish "test card" lists of their own. For pure-frontend validation work without hitting an API, generate Luhn-valid numbers locally instead.

How it works​

  1. Pick the issuer — Visa (starts with 4, 13/16/19 digits), Mastercard (51–55, 16), Amex (34/37, 15), Discover (6011/65, 16), JCB, Diners Club.
  2. Set the count — One number, or bulk up to 1,000.
  3. Configure expiry and CVV — Random future date or a specific MM/YY. CVV 3 digits (4 for Amex).
  4. Compute Luhn check digit — Standard mod-10 algorithm; the last digit is set so the full number passes.
  5. Export — CSV with PAN / expiry / CVV columns, or JSON with structured fields.

Examples​

Input: Visa, 1 number

Output: 4539 1488 0343 6467 (Luhn-valid; not a real account)

Input: Amex, 1 number

Output: 3782 822463 10005 (15-digit Amex format)

Input: Bulk 5 Mastercard, CSV

Output: PAN,expiry,cvv (5 rows of synthetic Luhn-valid Mastercard numbers)

Frequently asked questions​

Are these numbers real?

No. They pass the Luhn checksum and match issuer prefixes — that is what makes them useful for testing — but they are not linked to any account, holder, or balance.

Can I use them on a real PSP?

No. PSPs maintain a registered list of "test card numbers" (e.g. Stripe's 4242 4242 4242 4242). Synthetic numbers from this generator will be rejected by real test endpoints.

Is generating these legal?

Yes — Luhn-valid numbers are not in themselves illegal. Using them to attempt fraud is illegal. Use only for development and testing in environments you control.

Why is the CVV 4 digits for Amex?

American Express uses a 4-digit CID printed on the front. Other brands use a 3-digit CVV2/CVC2 on the back.

Will my fraud system block these?

It might — many fraud systems flag known test prefixes. That is fine for QA: the goal is to confirm the system catches the right things.

How do I avoid leaking these to real systems?

Tag every test number with a sentinel (e.g. expiry 01/30) and ensure your dev/staging environment never points to production payment APIs.

Tips​

  • Use only in non-production environments. Real PSPs reject synthetic numbers anyway.
  • For Stripe/Adyen integration tests, use their documented test card numbers instead — they trigger specific simulated flows (declined, 3DS challenge, etc.).
  • Rotate test numbers in your fixture suite — caching one Luhn-valid number for years makes regressions invisible.
  • Tag synthetic numbers in your DB (e.g. with an is_test flag) so they never accidentally surface in production reports.
  • Treat the generator output like real PII in your test environment: do not commit to Git, do not paste in support tickets.

Try it now​

The full credit-card-generator runs in your browser at https://ztools.zaions.com/credit-card-generator — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-05 · Author: Ahsan Mahmood · Edit this page on GitHub