Understanding RNG: How Random are Online Casino Games?

Discover the inner workings of random number generators (RNG) in online casino games. Learn how they ensure fair gameplay and maintain the integrity of the industry.

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Have you ever wondered how random online casino games really are? Are the outcomes truly based on luck, or is there something more going on behind the scenes? In this article, we’ll explore the concept of the Random Number Generator (RNG) and its role in ensuring fair gameplay. Whether you’re an avid gambler or just curious about the inner workings of online casinos, this article will provide you with valuable insights.

What is RNG?

The Random Number Generator (RNG) is the backbone of online casino games. It is a mathematical algorithm designed to generate random and unpredictable results. This ensures that every outcome is independent of previous results and purely based on chance. The RNG is constantly working behind the scenes, determining the symbols that appear on slot machines, the cards dealt in a hand of blackjack, or the numbers that come up on a roulette wheel.

Online casinos use sophisticated RNG algorithms to ensure fairness and avoid any manipulation or predictability.

How Does RNG Work?

The RNG works by utilizing complex mathematical formulas to generate sequences of random numbers. These algorithms take an initial value, known as a seed, and use it to produce a sequence of numbers. The seed can be based on various factors, such as the current time or player input, to increase randomness.

Each random number generated by the algorithm is completely independent of previous numbers, creating an unpredictable sequence. This randomness is crucial to ensure that every outcome is fair and not influenced by any external factors.

Third-Party Audits

To guarantee the integrity of online casino games, most reputable gambling operators subject their RNGs to regular third-party audits. These audits are carried out by independent testing agencies, such as eCOGRA, iTech Labs, or Technical Systems Testing (TST), who ensure that the RNG is working properly and producing truly random results.

During the audit process, these agencies analyze the RNG algorithms to check for any patterns or biases. They also examine the source code of the games to verify their fairness. If an online casino passes the audit, it receives a certification that assures players of the reliability and fairness of its games.

Pseudo-Random Number Generator (PRNG)

While RNGs generate numbers that appear random, they are technically pseudo-random as they are generated by algorithms. However, the complexity of these algorithms makes it virtually impossible to predict the next number in the sequence.

PRNGs use deterministic algorithms that repeat their sequences after a certain period. However, the time period is so long that it is unlikely to ever repeat during the lifetime of the universe. This ensures the randomness of the outcomes and prevents any predictability.


The concept of RNG is essential to maintaining the fairness and integrity of online casino games. The use of sophisticated algorithms and regular third-party audits ensures that the outcomes are truly random and independent of any external factors. So the next time you spin the reels of a slot machine or play a hand of poker online, you can rest assured that the results are based solely on chance.

Understanding the RNG gives players confidence in the fairness of online casinos and allows them to enjoy their favorite games without any doubts.

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