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Validador de cartão de crédito

Credit card validator: validate numbers with Luhn and detect Visa and Mastercard for payments and fraud prevention, with one-click copy and offline.

Como usar

Digite um número de cartão; o resultado e a bandeira são exibidos automaticamente.

Overview

Credit Card Validator is a Developer tool. Validate numbers with Luhn and detect Visa and Mastercard for payments and fraud prevention, with one-click copy and offline. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

  • Daily use of Credit Card Validator: Enter a card number to validate it and see the brand. — enter and get instant results without manual lookup.
  • One-click copy keeps results ready to save, check or share with family and pros.
  • Use Credit Card Validator offline or on poor network — all calculations stay local and private.
  • Format and validate JSON
  • Escape code for string literals

How to use

  1. 1 Enter a card number to validate it and see the brand..
  2. 2 Pick action and options
  3. 3 Fix highlighted errors
  4. 4 Copy or export

Highlights

  • Local & private: processing stays in your browser
  • Live validation with tolerant parsing
  • One-click copy and export for docs, code or sheets
  • Batch and offline support under poor network

Notes

  • Strict JSON disallows comments/trailing commas
  • Disable live validation for large files
  • Watch greedy vs lazy regex

FAQ

Offline?
Yes, parsing is local.
Why invalid?
Trailing commas, single quotes or BOM often cause it.
How is Credit Card Validator different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “credit card validator, Luhn” and one-click copy for reuse.
Can I use results in official reports?
Use it as a working draft and cross-check with authoritative sources; keep the exported log and parameters for traceability.
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Todos os cálculos são executados localmente no seu navegador; nenhum dado é enviado.