Card Number Redactor for Logs
Find card numbers in pasted text or logs and mask them before sharing.
Tool inputs stay in your browser · optional AI search sends your query
Good to know: Finds 12–19 digit sequences (spaces or dashes allowed) that pass the Luhn check and masks all but the last 4 digits. Runs entirely in your browser.
How to use it (step by step)
- 1Type or paste your text into the “Text or logs” box. There is already an example in it so you can see how it works; press Clear to start with your own.
- 2The answer appears right away in the “Redacted” box. No button needed.
- 3Press Copy and paste the result wherever you need it.
Words to know
- Masking
- Hiding most of a number with dots or stars, like •••• 4242, so it cannot be misused.
- Redaction
- Covering private information with solid black so nobody can read it.
- Luhn check
- A quick math test every real card number passes, like a spelling check for numbers. Passing it only means the number is typed in the right shape, not that the card is real.
More in Cards & Payments
Stripe Radar, Dispute & Refund Test CardsStripe cards that trigger Radar risk, CVC/address check failures, disputes and async refunds.Stripe ACH Test Bank AccountsStripe test bank account numbers for ACH Direct Debit success and failure cases.PayPal Sandbox Test CardsPayPal sandbox card numbers plus the CCREJECT triggers for simulated declines.Braintree Sandbox Test CardsBraintree valid cards and cards that fail verification (processor declined).Braintree Test Amounts & CVV/AVS RulesType an amount and see what the Braintree sandbox will do with it, plus CVV and postal-code triggers.Adyen Test CardsAdyen test card numbers by brand and card type: Visa, Mastercard, Amex, Elo, Dankort, UATP and more.