Are these real credit card numbers?

No, they are randomly generated numbers that only pass the Luhn checksum used for basic format validation. They are not linked to real accounts.

Can these be used to make real purchases?

No, most payment processors specifically reject or reserve these ranges for test-mode only.

What is the Luhn algorithm?

A simple checksum formula used to validate card number formats and catch typos.

Is my data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your input never leaves your device and nothing is logged or stored on our servers.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

Credit Card Test Number Generator

Generate Luhn-valid fake card numbers for testing.

Support

Works Offline

Privacy First

No Login

No API

⚠️ These are algorithmically valid (Luhn) test numbers for sandbox/test environments only. They are not real card numbers and cannot be used for actual purchases.

Card network

Count

Generated test numbers

4254836530770686
4507494616542192
4531790395736164
4648127136482370
4840461707072765

About the Credit Card Test Number Generator

Generate algorithmically valid (Luhn checksum) test credit card numbers for Visa, Mastercard, American Express, and Discover formats, clearly labelled for use in sandbox and test environments only.

Examples

Visa test number

network=visa

Output

4111 xxxx xxxx xxxx (Luhn valid)

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

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Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser