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Validation

Credit Card Samples

Valid credit card number samples for various networks (Visa, MasterCard, Amex, etc.) for testing purposes

Samples

Entries inside this sample collection

TextSimple

Common Credit Card Numbers

A list of valid test credit card numbers for various networks

plaintext
# Credit Card Samples
# These are generated test numbers that pass the Luhn algorithm.
# Do NOT use real credit card numbers.

# --- Common Networks ---

# Visa (Prefix 4)
4532549385285775

# MasterCard (Prefix 51-55, 2221-2720)
5424564177250828

# American Express (Prefix 34, 37)
375909374676368

# Discover (Prefix 6011, 65)
6011977278646461

# --- Regional / Other Networks ---

# China UnionPay (Prefix 62)
6221264511056683

# JCB (Japan Credit Bureau) (Prefix 3528-3589)
3528192949271243

# Diners Club International (Prefix 300-305, 36, 38)
30008036405527

# Maestro (Debit cards)
5018427297290169

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Validation

Credit Card Validator

Validate credit card numbers and identify card type (Visa, MasterCard, UnionPay, etc.)

Finance

Credit Card Payoff Calculator

Compare avalanche (highest APR first) vs snowball (lowest balance first) strategies for paying off multiple credit cards. Enter cards as 'name, balance, APR%, minPayment%' per line plus an extra monthly payment. Shows payoff time, total interest, savings vs minimum-only, and balance decline curves.

Games

Bingo Card Generator

Generate customizable bingo cards for various game types

Design

Figma iOS Android pt dp sp Responsive Design Spec Card

Convert a Figma px value into iOS pt, Android dp/sp, web rem/vw with a fluid clamp() snippet, a density-bucket render table and a touch-target accessibility audit, as a developer spec card.

Design

Font Pairing Preview Card

Preview a heading and body font pairing with real copy, sizes, weights, line heights, character samples, and CSS stacks.

Document Tools

NATO Phonetic and ICAO Spelling Card Builder

Expand text into ICAO, ITU or ARRL spelling words and download a printable PDF card

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Create three obituary lengths, a spoken eulogy and a printable memorial card privately, with editable drafts and optional AI rewriting.

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Validation

IP Address Samples

Collection of IPv4 and IPv6 addresses in various formats for validation testing

Validation

MAC Address Samples

Collection of MAC addresses in various formats for validation testing

Validation

VIN Samples

Collection of valid Vehicle Identification Number (VIN) samples from various manufacturers and countries for testing

Validation

Regex Pattern Alternatives

Multiple ways to write the same regex pattern with different trade-offs in readability, performance, and accuracy

Validation

Color Code Samples

Collection of color codes in various formats (Hex, RGB, HSL, named colors) for validation testing

Validation

Date & Time Samples

Collection of date and time strings in various formats for validation testing