Annnekkk Generator
The fastest way to generate structurally valid test credit card numbers for development, QA automation, and payment gateway testing. Every number satisfies the Luhn algorithm — so it passes format checks — but carries zero real-world value and cannot process actual transactions.
Card Generator
Configure the parameters below and click Generate Cards. Numbers pass the Luhn check but cannot be used for real transactions.
Card Validator
Validate any card number against the Luhn algorithm and detect the card brand.
Key Parameters
Understanding each field helps you generate exactly the cards your tests need.
BIN / Prefix
Bank Identification Number — the first 6–11 digits of a card. It determines the card network and issuing bank. Use a real BIN (e.g. 453590 for Visa) to produce network-specific test numbers.
Quantity
How many unique card numbers to generate per batch. You can generate up to 1,000 numbers at once, useful for bulk QA fixture files or load-testing scripts.
Expiry Date
Month and year appended to each card. Set both to Random for varied test data, or lock them to a specific date to test expiry-validation edge cases in your payment flow.
CVV
Card Verification Value — 3 digits for most networks, 4 for Amex. Leave blank to randomize per card, or enter a fixed value to keep CVV constant across the entire batch.
Output Format
Choose PIPE for pipe-delimited rows, CSV for spreadsheet import, or JSON for direct use in API test payloads and fixture files.
Luhn Check
Every generated number is automatically verified with the Luhn algorithm before output. The validator section lets you check any arbitrary card number independently.
Key Features
Everything you need for modern payment integration testing — no account, no cost.
How to Use
Generate a batch of test cards in under 30 seconds.
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01
Enter a BIN / Prefix
Type the first 6–11 digits of the card you want to simulate. For example,453590generates Visa numbers issued by a specific bank range. You can find real BIN ranges from public BIN lookup databases. -
02
Set the quantity
Enter how many unique card numbers you need — between 1 and 1,000. Each number in the batch is independently generated with a unique random body. -
03
Configure expiry & CVV
Leave the month and year selectors on Random for varied data, or pick specific values to test expiry-edge cases. Enter a fixed CVV or leave blank to randomize per card. -
04
Choose an output format
Select PIPE for raw delimited lines, CSV to open in Excel / Google Sheets, or JSON for use in API test fixtures or Postman collections. -
05
Click Generate Cards
Results appear instantly in the output textarea. Select all and copy, or scroll through the list. For JSON output, the array is pretty-printed and ready to paste. -
06
Validate any number
Scroll down to the Card Validator, paste any card number, and click Check Number to confirm Luhn validity and detect the card network brand.
Common Use Cases
How developers and QA engineers use Annnekkk Generator every day.
Payment Gateway Integration
Test your Stripe, Braintree, PayPal, or custom payment gateway integration without using real card credentials. Generate Luhn-valid numbers that pass format validation layers.
QA Automation & CI Pipelines
Seed test databases or fixture files with bulk card data. Generate 100–1,000 unique numbers in JSON format and import them directly into your automated test suite or CI/CD pipeline.
Form Validation Testing
Verify that your checkout forms correctly accept valid card formats and reject invalid ones. Test field-length handling, Luhn error messages, and brand detection UI in isolation.
Developer Education
Understand how the Luhn algorithm works by generating numbers and inspecting the output. Use the built-in validator to explore which BIN prefixes map to which card networks.
Load & Stress Testing
Generate large batches of varied card numbers to simulate realistic transaction volumes in your staging environment without exposing real cardholder data.
Security & Penetration Testing
Use structurally valid card numbers in authorized penetration tests to verify that your application correctly rejects test data at the payment processor level rather than the format layer.
Frequently Asked Questions
Everything you need to know about Annnekkk Generator.
Are these real credit card numbers?
No. The numbers are mathematically generated to satisfy the Luhn checksum algorithm and match the digit-length of real card networks, but they are not linked to any bank account, cardholder, or financial instrument. They cannot be used for actual purchases and will be declined by any real payment processor.
Is it legal to generate test card numbers?
Yes, generating structurally valid card numbers for development, QA, and educational purposes is legal. These numbers do not constitute fraud because they have no monetary value and are not associated with real accounts. They are equivalent to the official test card numbers published by Stripe, PayPal, and other payment providers.
What is the Luhn algorithm?
The Luhn algorithm (also known as the "modulus 10" algorithm) is a simple checksum formula used to validate identification numbers — most commonly credit card numbers. It works by doubling every second digit from the right, summing all digits, and checking that the total is divisible by 10. Every major card network uses it as a first-pass format check.
What is a BIN / Prefix?
A BIN (Bank Identification Number) is the first 6 digits of a card number. It identifies the card network (Visa, Mastercard, etc.) and the issuing bank. The tool auto-detects the network from your prefix and adjusts the total card length accordingly (15 digits for Amex, 16 for most others).
Will these numbers pass payment gateway validation?
They will pass format validation (Luhn check, length, prefix). They will not pass authorization — a real payment processor verifies the card against a bank's live records, which these numbers do not exist in. Use the official sandbox/test card numbers from your payment provider for end-to-end flow testing.
Is my data sent to a server?
No. All generation and validation logic runs entirely in your browser via JavaScript. No card numbers, inputs, or results are transmitted to any server. You can verify this by opening DevTools and checking the Network tab — no requests are made when you generate or validate.
Which card networks are supported?
Visa, Mastercard, American Express (Amex), JCB, and Discover are automatically detected from the BIN prefix. The card length is set to 15 digits for Amex and 16 digits for all other networks.
What is the maximum number of cards I can generate?
You can generate up to 1,000 unique card numbers per batch. Each number has an independently randomised body, so duplicates are statistically negligible at that scale.