Test Credit Cards for Payment Sandboxes

Copy sandbox test card numbers in one click, grouped by environment, with packs from Stripe, Mercado Pago, Conekta and more.

Keep the test card numbers of your payment sandboxes one click away. Test Credit Cards stores card numbers that payment gateways publish for sandbox testing, grouped by environment (development, staging, a client project). Open the popup next to your checkout, pick the scenario you need (approved, declined, insufficient funds) and copy the number. What you can do: • Copy a card with a click, or press keys 1 to 9. • Search with "/". • Copy the expiry date, CVV and postal code with one-click chips. • Add a card with a form: it detects the brand, checks the Luhn digit and warns you when a number is not a known test number. • Import cards from a JSON file, or add a ready-made pack of sandbox cards for popular payment gateways, with numbers taken from each gateway's official docs. • Rename environments, delete cards or environments (with undo), edit the JSON, and export or import a backup file. • Light and dark theme that follows your system, and a Spanish/English switch. • Open the popup with Alt+Shift+K. For sandbox and test environments only. Do not store real payment cards in this extension. It does not generate card numbers. Privacy: everything stays in your browser (chrome.storage.local). The extension makes no network requests, has no analytics, and asks for a single permission: "storage". Fonts are bundled. If you used version 2, your data migrates automatically. New in 3.0.0: new design, gateway packs, keyboard shortcuts, backup export/import, English interface, stricter security.