Are these credit card numbers real?

No. Every number this tool generates is Luhn-valid (passes the mod-10 checksum that payment processors use for basic validation) but UNASSIGNED — meaning no bank has ever issued them. They are for sandbox / development / testing only. They CANNOT be used for real payments. Attempting to do so is fraud.

Which card brands are supported?

Eight brands with their correct IIN/BIN prefixes and lengths: Visa (4, 16 digits), Mastercard (51-55 + 2221-2720 2-series, 16 digits), American Express (34/37, 15 digits, 4-digit CVV), Discover (6011/65/644-649/622126, 16 digits), JCB (3528-3589, 16 digits), Diners Club (300-305/36/38, 14 digits), UnionPay (62, 16 digits), and Maestro (5018/5020/5038/6304/6759/6761-6763, 16 digits).

How does the Luhn algorithm work here?

We pick a brand prefix, fill the middle with random digits, then compute the correct Luhn check digit so the full number always passes mod-10 validation. The same is true for the included processor sandbox library — every published test number from Stripe, Adyen, Braintree, and PayPal in our library is Luhn-valid (we verify each on load).

Can I bulk-generate test cards for automated test suites?

Yes. Generate up to 10,000 card bundles per click — each bundle includes number, expiry (MM/YY, always future-dated), CVV (3 digits, or 4 for Amex), and a fake cardholder name. Export as JSON, CSV, or plain text with your preferred number formatting (plain, spaced, dashed, or Amex-style 4-6-5 grouped).

What extra features does this tool have versus other card generators?

(1) Eight brands with correct BIN prefixes + lengths. (2) Luhn-valid check digit always. (3) Full bundle (number + expiry + CVV + cardholder). (4) Bulk generation up to 10k. (5) Four number formats (plain/spaced/dashed/grouped). (6) Brand auto-detection from a pasted number. (7) Processor sandbox library with official Stripe/Adyen/Braintree/PayPal test cards. (8) Scenario-tagged decline cards (insufficient funds, 3DS required, fraud, etc.). (9) Deterministic seed for reproducible test fixtures. (10) Export JSON/CSV/text. (11) localStorage history (max 20). (12) Shareable URL with seed + brands + format encoded. (13) Prominent honesty banner.

Developer Runs in your browser

Credit Card Test Number Generator

Generate Luhn-valid, clearly-fake test credit card numbers for sandbox use. Per-brand BIN prefixes (Visa, Mastercard, Amex, Discover, JCB, Diners, UnionPay, Maestro) with matching expiry, CVV, and cardholder name. Bulk export to JSON/CSV/text. Includes official processor sandbox library (Stripe, Adyen, Braintree, PayPal). 100% client-side — sandbox only, never real.

100% Private Works Offline Instant

These are Luhn-valid but UNASSIGNED test numbers for sandbox/development only. They CANNOT be used for real payments. Never attempt to use generated numbers against live payment systems.

Seed (deterministic)

Count (max 10,000)

Card number format

Brands (pick at least one — empty = random across all)

Generated test cards (10)

Visa4400 4266 9559 341311/28CVV 606Chris Smith

Visa4785 9933 9218 626707/27CVV 456Reese Miller

Visa4189 2090 1488 770901/29CVV 043Alex Brown

Visa4848 7563 0976 829404/28CVV 534Avery Davis

Visa4354 2040 4558 421809/30CVV 118Cameron Thomas

Visa4396 0373 0269 188204/27CVV 733Chris Miller

Visa4397 7226 0759 637803/29CVV 917Avery Smith

Visa4311 6971 4342 427209/32CVV 130Jordan Williams

Visa4659 7069 6874 369809/28CVV 136Alex Davis

Visa4021 5062 8911 323811/29CVV 402Logan Hall

Export (JSON)

1,638 bytes

[
  {
    "brand": "visa",
    "number": "4400426695593413",
    "expiryMonth": "11",
    "expiryYear": "28",
    "cvv": "606",
    "cardholder": "Chris Smith"
  },
  {
    "brand": "visa",
    "number": "4785993392186267",
    "expiryMonth": "07",
    "expiryYear": "27",
    "cvv": "456",
    "cardholder": "Reese Miller"
  },
  {
    "brand": "visa",
    "number": "4189209014887709",
    "expiryMonth": "01",
    "expiryYear": "29",
    "cvv": "043",
    "cardholder": "Alex Brown"
  },
  {
    "brand": "visa",
    "number": "4848756309768294",
    "expiryMonth": "04",
    "expiryYear": "28",
    "cvv": "534",
    "cardholder": "Avery Davis"
  },
  {
    "brand": "visa",
    "number": "4354204045584218",
    "expiryMonth": "09",
    "expiryYear": "30",
    "cvv": "118",
    "cardholder": "Cameron Thomas"
  },
  {
    "brand": "visa",
    "number": "4396037302691882",
    "expiryMonth": "04",
    "expiryYear": "27",
    "cvv": "733",
    "cardholder": "Chris Miller"
  },
  {
    "brand": "visa",
    "number": "4397722607596378",
    "expiryMonth": "03",
    "expiryYear": "29",
    "cvv": "917",
    "cardholder": "Avery Smith"
  },
  {
    "brand": "visa",
    "number": "4311697143424272",
    "expiryMonth": "09",
    "expiryYear": "32",
    "cvv": "130",
    "cardholder": "Jordan Williams"
  },
  {
    "brand": "visa",
    "number": "4659706968743698",
    "expiryMonth": "09",
    "expiryYear": "28",
    "cvv": "136",
    "cardholder": "Alex Davis"
  },
  {
    "brand": "visa",
    "number": "4021506289113238",
    "expiryMonth": "11",
    "expiryYear": "29",
    "cvv": "402",
    "cardholder": "Logan Hall"
  }
]

Validate / detect a card number

Processor sandbox library (31 official cards)

Visasuccess4242 4242 4242 4242

Visa — successful payment

Visasuccess4000 0566 5566 5556

Visa (debit) — successful payment

Mastercardsuccess5555 5555 5555 4444

Mastercard — successful payment

Mastercardsuccess2223 0031 2200 3222

Mastercard 2-series — successful payment

American Expresssuccess3782 822463 10005

American Express — successful payment

American Expresssuccess3714 496353 98431

American Express — successful payment (alt)

Discoversuccess6011 1111 1111 1117

Discover — successful payment

JCBsuccess3530 1113 3330 0000

JCB — successful payment

Diners Clubsuccess3056 9300 0902 0004

Diners Club — successful payment

Visadecline4000 0000 0000 0002

Visa — generic decline

Visainsufficient_funds4000 0000 0000 9995

Visa — insufficient funds decline

Visaincorrect_cvc4000 0000 0000 0010

Visa — incorrect CVC decline

Visaexpired_card4000 0000 0000 0069

Visa — expired card decline

Visaprocessing_error4000 0000 0000 0119

Visa — processing error decline

Visa3ds_required4000 0000 0000 3220

Visa — 3DS authentication required

Visa3ds_required_attempt4000 0000 0000 3055

Visa — 3DS authentication supported but not required

Visafraud4100 0000 0000 0019

Visa — risk-level-elevated (Stripe Radar)

Sandbox only: Every number here is Luhn-valid but UNASSIGNED — generated locally via a seeded mulberry32 PRNG. They cannot be used for real payments. History stored in localStorage (max 20).

How to use

Enter your input in the tool above.
Adjust any options to your preference.
Use the Copy or Download buttons to save the result.
Everything happens locally — your data never leaves your browser.

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