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What is an "RNG" at Casinos Online?

Random Number Generators, abbreviated as RNGs, are sophisticated algorithms designed to generate a sequence of numbers with no discernible pattern. 

In simpler words, it's like a special computer that creates numbers without any pattern. These numbers are used to decide who wins in casino games.

First, it is important to clarify the term “Random”. Randomness means that it is impossible, or very difficult, to predict a particular action's outcome.

In the case of casino games, this is, for example, predicting the next card that appears on the table, or the symbols for a spin in a video slot.

How Does a Random Number Generator Work?

OK, but how does the random number generator work then? Well, imagine it's like a super-fast calculator. It does math very quickly and comes up with numbers. The RNG system operates around the clock, generating numbers continuously.

These numbers decide what happens in games like slots, cards, and roulette. Let's dive into the details:

  • Online Slots: The RNG determines which symbols will appear on the spinning reels of online slots, creating an unpredictable and exciting experience.

  • Roulette: In roulette, it plays a pivotal role in selecting the numbered slot where the ball will eventually land, ensuring complete randomness.

  • Card Games: When you're playing card games, such as poker or blackjack, the random number generator takes on the role of the dealer, shuffling and dealing the cards in a way that no one can predict.

  • Dice Games: For dice games like craps, the RNG acts as the virtual dice roller, ensuring that the outcomes are entirely random, just like rolling physical dice.

  • Bingo: Even in virtual bingo, the RNG is at work, selecting the numbers that make each game unique and unpredictable.

RNGs are the backbone of online casinos, ensuring that the outcomes of slot spins, card games, and roulette are entirely unpredictable, so everyone has a fair chance to win.

Why RNGs Are Crucial in Online Casinos

The RNG makes sure that winning is always fair and equal.

Let's say you just had a free spin bonus. Well, the chance of getting another free spin is the same whether it's right after the bonus or much later. It's a bit like rolling a dice. Each time you roll it, the chances of getting a six are the same, no matter what happened before.

Basically, RNGs are important for the following reasons:

Fair Play for Everyone

RNGs make sure everyone playing has an equal chance of winning. This makes players and casinos trust each other.

No Cheating Allowed

RNGs keep games from being unfair. Cheating is hard because no one can guess what the next number will be.

More Fun Games

Because of RNGs, casinos can make lots of different games with exciting outcomes. This keeps players entertained.

Is Hacking of Casino Random Number Generator Possible?

Hacking a casino's Random Number Generator is really hard and not something regular people can do. Casinos use strong security to protect them. So, for most people, it's not possible.

One reason is that the factors used in the RNG are often kept secret. Also, it's impossible to know things like how much carbon is in a casino's computer system at a certain time. Third, the correct algorithm and operation of this sequence have yet to be discovered before predicting a move, outcome, or card. 

Plus, the exact way the RNG works is still a mystery, making it hard to predict game results. 

Can Casinos Control the RNG?

Casinos can't really control the RNG. It's designed to be fair and random, so they can't make it favor one player or another. 

Even though the games are fair, it's essential to know they're designed to work a certain way. For example, slot machines don't pay out all the money they take because they're set to keep some for the casino.

So, while you're not treated unfairly compared to other players, the casino still has an advantage over you. That's why it's important to cash out when you win big.

What is a Pseudo-Random Number Generator?

A Pseudo-Random Number Generator (Pseudo RNG) uses software to create random results in casino games. It doesn't consider external factors like a real random system would.

Instead, it relies on an algorithm stored in a chip. This algorithm gives results based on a key or starting point. Since it doesn't use outside factors, it can produce game outcomes very quickly.

The software RNG works based on this starting key. If someone figures out this key, they can predict the game's result at a certain time.

While there's a bit of predictability in it, it's not a problem in casino games unless hackers exploit it. Because Pseudo RNGs are faster and don't need extra hardware, they're commonly used in both online and offline casinos.

How Do Casinos Provide Random Results?

Casinos, whether online or in-person, use different methods to make sure games are random.

For card games, like poker, they might shuffle the cards by hand or use a machine that shuffles them randomly. Statisticians say you need to shuffle the cards really well, like seven times or more, or mix them on the table for about a minute.

But most casino games, including the ones you play online, use something called a (Pseudo) Random Number Generator. It's like a computer program that generates random results.

How it does this can vary from one game to another and depends on the game maker or the casino itself.

RNG Certification in iGaming: Ensuring Fair Play

In the world of online gambling, ensuring that games are fair and trustworthy is a top priority. This is where RNG (Random Number Generator) certification comes into play.

RNG certification is like a seal of trust for both players and casinos. It confirms that the games are fair and can't be tampered with. Players seek out certified casinos because they want to be sure their money is safe, and the games are honest.

Several reputable organizations provide RNG certification. Let's look at a few of them:

BMM TestlabsBMM Testlabs has been around for over 30 years, testing and certifying games. They check if the games meet RNG standards, ensuring fairness. 
iTech LabsiTech Labs has been certifying games since 2004. They make sure games follow the rules and laws of different places.
QUINELQUINEL is another respected organization in the iGaming industry that provides RNG certification. Based in Europe, they focus on ensuring that games comply with strict regulatory standards. 
Gaming Labs International (GLI)GLI is known globally for certifying RNG-based games. They test games to make sure they meet the rules of different jurisdictions.
eCograeCogra is based in London and focuses on protecting players' rights and ensuring fair games. They have technical experts who carefully examine games to make sure they use RNG properly. 


In a nutshell, the random number generator certification is like a quality check for online casino games. It assures players that the games are fair, and the results are purely based on luck. Casinos work with these certifying organizations to gain players' trust and show that they're playing by the rules.

Common Misconceptions About RNGs in Casinos

Random Number Generators (RNGs) can seem confusing, leading to various misconceptions or myths. Let's clear up some of the most common ones:

Myth #1: Casinos Can Control RNGs

Fact: RNGs are designed to be fair and beyond the control of casinos. They operate through complex algorithms that continuously generate random numbers, making it impossible for the casino to manipulate outcomes in favor of the house or any specific player.

Myth #2: RNGs Favor the Casino

Fact: RNGs do not have biases. They ensure that game outcomes are entirely random, providing fair chances to all players. While the odds may favor the house slightly due to the casino's profit margin (known as the house edge), this is not a result of manipulating the RNG.

Myth #3: Previous Outcomes Affect Future Results

Fact: Each spin or game outcome is independent of past results. Just because a slot machine paid out a jackpot in the previous spin does not mean it won't pay out again on the next one. RNGs do not remember or react to past events.

Myth #4: RNGs Can Be Predicted

Fact: Genuine RNGs are designed to be unpredictable. Predicting their outcomes is extremely difficult, if not impossible. Even if someone knew the starting point (seed) of the RNG, they still couldn't foresee the sequence of numbers generated due to their complexity.

Myth #5: Casinos Can Rig RNGs to Cheat Players

Fact: Licensed and regulated casinos are subject to strict oversight and auditing by independent agencies. Rigging RNGs would not only be unethical but also illegal. Casinos that engage in such practices risk losing their licenses and facing legal consequences.

Myth #6: Online Casinos Use Different RNGs Than Land-Based Casinos

Fact: Both online and land-based casinos employ RNGs to determine game outcomes. While the technology might differ slightly, the core principle of fairness and randomness remains the same.

Player Tips: Ensuring Fair Play at Reputable Casinos

When engaging in online casino gaming, it's essential to ensure that you're playing at a reputable platform that employs genuine Random Number Generators (RNGs).

Here are some practical tips to help you make the right choices and enjoy a fair gaming experience:

  1. Check for Licensing and Certification: Reputable casinos are licensed and regulated by recognized authorities. Look for certifications or logos from organizations like eCOGRA, iTech Labs, or the Malta Gaming Authority on the casino's website. These indicate that the casino's RNGs have been tested for fairness.

  2. Read Reviews and Research: Do some online research and read player reviews about the casino you're considering. This can provide insights into the casino's reputation and whether players have had fair experiences.

  3. Verify Game Developers: Trustworthy game developers, like NetEnt, Microgaming, or Playtech, often work with reputable casinos. Check which game developers are associated with the casino. Renowned developers are more likely to use fair RNG systems.

  4. Customer Support: Reach out to the casino's customer support with questions about their RNGs. A responsive and informative customer support team is a good sign of a reputable casino.

  5. Transparency: A reputable casino should provide information about its RNGs, including the testing process and certification. Look for transparency in their operations.

  6. Payout Percentages: Some casinos publish payout percentages for their games. While this doesn't directly relate to RNGs, it can give you an idea of the casino's commitment to fairness.

  7. Avoid Unverified Platforms: Be cautious of lesser-known casinos without proper licensing or those that withhold information about their RNGs. These platforms may not prioritize fairness.

  8. Set Limits and Play Responsibly: Regardless of the casino, it's essential to set limits on your spending and play responsibly. RNGs ensure randomness, but gambling should always be enjoyable and within your means.

By following these tips, you can enhance your chances of having a fair and enjoyable gaming experience at reputable online casinos that use genuine RNGs. Remember that responsible gaming is key to a positive casino experience.

Nerijus Grenda
Nerijus Grenda
Last Update: 13 Oct 2023
Nerijus Grenda is a prolific contributor to the GoodLuckMate site. With a deep understanding of the online casino industry, gained from his own experience as an avid player, he offers valuable insights on what sets the best casinos apart from the rest. As a writer, Nerijus shares his expertise through expert analysis and thoughtful commentary on various topics related to online gambling, including casino reviews, game guides and industry trends.

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