# Credit Card Validator Validate credit card numbers and identify card type (Visa, MasterCard, UnionPay, etc.) > Canonical page: https://elysiatools.com/en/tools/credit-card-validator - **Category:** Validation - **Keywords:** credit, card, validator, visa, mastercard, amex, discover, unionpay, luhn, payment ## Overview The Credit Card Validator is a straightforward online tool that verifies credit card numbers using the Luhn algorithm and identifies the card type, such as Visa, MasterCard, or UnionPay, based on the number's prefix. ## Inputs - **Card Number** (text): Enter credit card number (e.g., 4111-1111-1111-1111)... ## When to use - When you need to check if a credit card number is valid before processing a payment or transaction. - To identify the card type from a given number for display, routing, or compatibility purposes. - During data entry or validation to ensure card numbers are correctly formatted and error-free. ## How it works - Enter the credit card number into the input field, including any spaces or dashes. - The tool applies the Luhn algorithm to perform a checksum validation on the number. - It then analyzes the number's prefix to determine the card type (e.g., Visa starts with 4, MasterCard with 5). - The result displays whether the card is valid and the identified card type. ## Use cases - E-commerce checkout processes to verify card details before payment authorization. - Software development and testing for implementing or debugging card validation logic in applications. - Customer support scenarios to quickly check card information provided by users for accuracy. ## Frequently asked questions ### What is the Luhn algorithm? The Luhn algorithm is a simple checksum formula used to validate identification numbers like credit cards by detecting accidental errors. ### Which card types does this tool support? It supports major card types including Visa, MasterCard, American Express, Discover, and UnionPay, based on standard prefixes. ### Is my card number stored or transmitted? No, the tool processes the number locally in your browser and does not store, share, or transmit any data. ### What does it mean if a card number is invalid? An invalid result indicates the number fails the Luhn check, which could be due to a typo, incorrect format, or a non-existent card number. ### Can I validate multiple card numbers at once? Currently, the tool validates one card number per use to ensure accuracy and simplicity; batch processing is not supported. ## Related tools - [ICCID Validator](https://elysiatools.com/en/tools/iccid-validator): Validate ICCID numbers for SIM cards with Luhn checksum and issuer analysis - [ISIN Validator](https://elysiatools.com/en/tools/isin-validator): Validate International Securities Identification Numbers (ISO 6166 ISIN) with Luhn check-digit verification, country/issuer prefix and NSIN breakdown. - [Luhn Checksum Calculator](https://elysiatools.com/en/tools/luhn-checksum): Validate or generate numbers using the Luhn algorithm (mod-10). 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