Test card number generator. Luhn-valid, never chargeable.

How to use the Test Card Number Generator

This tool makes fake card numbers for testing payment forms, and checks any number you paste. Each number starts with a real brand prefix, has the right length for that brand and ends in a check digit that passes the Luhn checksum, so form validators accept it. The numbers are not linked to any account and cannot be charged. It is for developers and QA testers filling checkout forms, fixtures and test suites.

Step by step

1. 1
   Pick the brand and length

   On the Generate tab, choose a card network from Brand. Visa is the default. Then choose a Length: Visa offers 16, 13 or 19 digits, Amex is always 15 and Diners Club offers 14, 16 or 19. Mixed (random brands) picks a brand for each number and uses each brand's standard length.

2. 2
   Choose formatting and count

   Set Formatting to spaces, dashes or none. Amex numbers are grouped 4, 6 and 5, and 14 digit Diners numbers 4, 6 and 4; the rest are grouped in fours. Drag How many to make between 1 and 100 numbers. The default is 5.

3. 3
   Add the extra fields

   Future expiry (MM/YY) and CVV (3 digits, 4 for Amex) are ticked by default. Tick Fake holder name to add a made up first and last name. Untick anything your form does not need.

4. 4
   Generate the numbers

   Press Generate. The list shows the brand, the number and the extras on each line. Five Visa numbers are already there when the page opens. Use the copy icon at the end of a line to copy just that line.

5. 5
   Copy or export the batch

   Press Copy all for every line as text, CSV to download test-card-numbers.csv, or JSON to download test-card-numbers.json. Both files hold the unformatted number, and the JSON also holds the formatted one and a note that the numbers are for testing only.

6. 6
   Check numbers you already have

   Open the Validate tab and paste numbers into Paste card number(s), one per line. Spaces and dashes are ignored. Results update as you type. Press Copy results to copy one line per number with its brand, Luhn verdict and length.

Reading the validator

• Each line gets a brand chip worked out from the opening digits, for example 4 for Visa, 34 or 37 for American Express and 51 to 55 or 2221 to 2720 for Mastercard. An amber unknown brand chip means no supported prefix matched.
• The Luhn chip says valid or invalid. Invalid usually means a typo, because one wrong digit, or most swaps of two neighboring digits, breaks the checksum.
• The length chip shows the digit count. If it is not a length that brand uses, it adds atypical in amber, for example a 15 digit number that starts with 4.
• A line with fewer than 8 or more than 19 digits is marked not a card number. The summary above the list counts how many lines were checked, passed and failed.

Tips and common mistakes

• Use these numbers to test input masks, length rules, brand icons and Luhn checks in your own forms. For a test payment that has to go through, use the test card numbers your payment provider publishes for its sandbox.
• Expiry dates are always one to four years ahead, so they pass a not expired check. Type a past date by hand when you need to test the expired path.
• Use Mixed (random brands) to check that your form switches the card logo and the CVV length correctly between brands.
• A pass in the validator only means the number is well formed. It says nothing about whether a real account exists.

Privacy and limits

Numbers are generated and checked in your browser with plain JavaScript. Nothing you generate or paste is sent anywhere or saved, and a reload clears the list. These are test numbers only: they cannot buy anything, and trying to use one for a real payment is fraud.

Back to the tool

Complete test data, zero risk.

• Generate test numbers for 6 major brands, Visa, Mastercard, American Express, Discover, JCB and Diners Club, with correct IIN prefixes and lengths, or a mixed random batch.
• Pick the digit length per brand (e.g. Visa 13/16/19) and format numbers with spaces, dashes, or no separator.
• Create 1 to 100 at once with optional future expiry dates, CVVs (4-digit for Amex) and fake holder names to fill every payment-form field.
• Copy line by line or all at once, or export the batch as CSV or JSON for test suites, fixtures and CI pipelines.
• Validate any card number, live Luhn check, automatic brand detection and a length-sanity flag, one number per line.
• Private by construction: generation and validation run entirely on your device; nothing is uploaded or stored.

Frequently asked questions.

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