Random Card Generator & Simulator (Crypto-Secure)

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Total Usage 0 times

Category Card Games

Deck Configuration

Preset

Infinite Deck (Auto-Reshuffle) If unchecked, cards are removed until deck is empty.

Draw Count

1

Actions

Live Probability

Deck 52/52

Press Draw to Start

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About

This Random Card Generator is engineered for scenarios where fairness and unpredictability are non-negotiable. Unlike standard generators that rely on pseudo-random algorithms, this tool utilizes the window.crypto API to ensure cryptographically secure randomness, simulating a physical shuffle with mathematical precision.

Beyond simple drawing, this application serves as a comprehensive deck simulator. It tracks the state of the deck (cards remaining vs. cards drawn), calculates real-time probabilities for the next draw, and supports multiple deck standards including Poker, Euchre, and Tarot. Whether you are a developer testing game logic, a teacher demonstrating Hypergeometric distribution, or a player without a physical deck, this tool provides a robust, persistent, and visually responsive environment.

Formulas

To ensure fairness, we use the Fisher-Yates shuffle algorithm driven by a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG). The probability P of drawing a specific suit S from the remaining deck is calculated dynamically:

P(S) = Count(S)N_remaining

Where N_remaining decreases with every draw in "Depletion Mode", fundamentally altering the odds compared to "Infinite Mode" where N is constant.

Reference Data

Feature	Standard Implementation	Our Crypto-Secure Implementation
Randomness Source	Math.random() (Pseudo-random)	window.crypto (CSPRNG)
Shuffle Algorithm	Naive Swap	Fisher-Yates (Knuth) Shuffle
State Persistence	None (Resets on reload)	localStorage (Auto-save)
Deck Entropy	≈ 2²²⁵ permutations	Full 52! coverage (8 × 10⁶⁷)
Draw Mode	Infinite (Replacement)	Toggle: Replacement OR Depletion
Visuals	Static Images	CSS3 3D Transforms & Vector Graphics

Frequently Asked Questions

It is cryptographically secure. We bypass the standard browser randomizer and access the device's entropy pool via the Web Crypto API. This makes the shuffle unpredictable even to the browser's own engine.

No. The application uses Local Storage to persist the exact state of your deck, drawn cards, and history. You can close the tab and resume your game later without losing progress.

Yes. The "Stats" panel updates in real-time. By disabling "Reshuffle after draw", you can demonstrate how the probability of drawing a specific suit or color changes as the deck depletes (sampling without replacement).

Use the "Deck Builder" tab. You can upload your own images (e.g., for board game prototyping or flashcards). These images are converted to local data strings and saved in your browser, so they remain private and available offline.