Random Number Generators at Online Casinos

Random Number Generators (RNGs) are essential to maintaining fairness in online casino games. When we engage with RNG casinos, we trust everything’s on the level.

But how do we know the games aren’t rigged? RNGs, the digital counterparts to shuffling cards or rolling dice, ensure that each spin of a slot machine or card shuffle is completely random.

These special programs are crucial for RNG casinos; without them, fair play cannot be guaranteed.

Here, we’ll explain how RNGs work at online casinos and introduce you to top RNG-certified sites that uphold the highest standards of fairness.

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What is RNG in Gaming?

Random Number Generator icon

The random number generator, or RNG, is a complex system that ensures every game outcome is unbiased by producing random numbers. And it is what keeps online casino games fair and transparent.

This RNG system is a mathematical algorithm that generates a string of numbers without any pattern or discernment. It’s the computational equivalent of picking a card from a deck.

Put simply, the RNG is the algorithm that decides the results of your spins, rolls, and deals.

How Do RNGs Work

There are two main types of RNGs: True RNGs and Pseudo-RNGs (PRNGs).

True RNGs generate randomness from physical processes, like atmospheric noise or other natural phenomena. This makes them genuinely random since they’re based on real-world events.

On the flip side, pseudo-RNGs (PRNGs) are more common in online casinos. PRNGs use mathematical algorithms to generate a sequence of numbers that seem random, as true randomness can’t be achieved this way.

Despite their limitations, PRNGs can be improved using an unpredictable seed number, like when a user clicks the mouse.

Some modern computer chips even use quantum mechanics to produce truly random numbers, but these are too slow for regular use. Instead, they often re-seed PRNGs periodically to ensure better randomness.

Creating a true RNG using only computer software is impossible because software always follows a set pattern; however, the results are random enough to be unpredictable.

This makes PRNGs fast, efficient, and perfect for online games.

Types of RGN Casino Games Online

online casino games icon

RNGs, or Random Number Generators, are the heart of fairness in online casino games. They decide the outcomes, ensuring every spin, card draw, or roll is random and fair.

This randomness ensures every game outcome is independent of previous ones, giving all players an equal chance to win.

Here are the most common types of casino games that use RNGs to ensure fairness at online casinos.

Online Slots

In slot machine games, RNGs determine each spin’s outcome.

When you press the button to spin the reels, the RNG generates a random number that matches a specific combination of symbols. This happens in a split second, ensuring each spin is random and independent.

So, every spin has an equal chance of winning, no matter what happened before.

Slots are programmed to have a consistent return-to-player rate or payback rate. The number of times a real-money slot will hit a winning combination is called the hit frequency.

RNGs randomly determine the two factors, although you likely won’t find a slot with inflated numbers for both. If the payback rate is high, the hit frequency is commonly programmed to be lower.

Table Games

RNGs are also vital for fairness in games like blackjack, roulette, and baccarat.

In blackjack, the RNG shuffles the virtual deck and deals the cards. In roulette, it decides where the ball lands. In baccarat, it handles the card dealing to both the player and the banker.

Video Poker and Specialty Games

RNGs also work in video poker, keno, and bingo. In video poker, the RNG shuffles the virtual deck and also deals the cards. For keno and bingo, it draws the numbers, ensuring each one is chosen randomly and fairly.

This randomness keeps these games fair, giving all players a fair chance to win. Live dealer casinos are the exception since they have real humans dealing with actual cards as they would in person.

Top RNG Slots We Recommend

For those seeking a legit online slot experience, we have curated a list of RNG slots certified by trusted third-party auditors like eCOGRA.

These slots not only offer captivating gameplay and engaging themes but also ensure that every spin is genuinely random, giving you a fair shot at winning.

Best Slot GamesRTPMin/Max BetDeveloper
Monster Pop slot gameRTP: 97.7%Bet Limits: $0.25/$25Developer: Betsoft
Coyote Cash slot gameRTP: 97.5%Bet Limits: $0.01/$25Developer: RTG
Fruit Loot Reboot slot gameRTP:97.24%Bet Limits: $0.20/$100Developer: Concept Gaming
Back To Venus slot gameRTP: 97.07%Bet Limits: $0.20/$20Developer: Betsoft
Total Overdrive slot gameRTP: 96.92%Bet Limits: $0.05/$10Developer: Betsoft

Find these and many other RNG slots at our recommended casinos.

RNG Certification for Online Gambling


A few major companies, such as iTech Labs, BMM TestLabs, Gaming Labs International, and eCOGRA, provide third-party auditing services to ensure fairness in online gambling.

They run extensive tests to check the randomness and unpredictability of the RNGs, ensuring they produce random and unbiased results.

Some of the most popular companies are:

  • eCOGRA: This independent agency is known for its Safe and Fair Seal, which certifies the fairness of RNGs and the overall integrity of online casinos. They also ensure that operators follow responsible gambling practices.
  • iTech Labs: A top international agency known for its detailed statistical analysis and rigorous testing methods.
  • Quinel: This independent is distinguished by its fast turnaround times and detailed compliance reports that meet national and international standards.
  • GLI (Gaming Laboratories International): GLI provides thorough testing and certification for gaming devices. It’s famous for its global reach and strict standards, ensuring compliance with regulations in many countries.
  • BMM Testlabs: One of the oldest and most experienced testing labs. It’s noted for its extensive industry experience and thorough testing protocols to ensure fairness.
  • SQS (Software Quality Systems): SQS provides testing and certification specifically for online gaming software, focusing on the reliability and fairness of RNGs.

Process For Obtaining An RNG Certificate

Leading casino software developers and gambling sites submit their games to a technical testing agency, which subjects them to a rigorous testing process that involves thousands of plays.

The agency analyzes the data, and if it determines that the results are truly random, it will certify the game as safe.

So, how can you identify legit RNG software in online casinos?

You can tell online casinos and games meet the standard for fairness by looking for a license and an RNG certification on the site. This information is usually found in the casino’s website’s footer or a dedicated fairness section.

You can also check their casino game providers and review their certifications. Certification guarantees that the site has been tested for randomness and that its games are fair to players.

Can You Beat Casino Random Number Generators to Win Money?

While the general consensus is that you cannot consistently beat an online casino’s Random Number Generator (RNG) system to make a profit, there are a few nuanced points that can help you understand the landscape better.

RNG and House Edge

Every casino game has a built-in house edge, giving the casino a mathematical advantage over players. This ensures that, over time, the casino site will profit.

The RNG does not alter the house edge; it ensures that the distribution of outcomes over many plays aligns with the game’s mathematical design.

While RNGs ensure that each game outcome is random and fair in the short term, the house edge guarantees the casino’s profitability over the long term.

RNG and Return to Player (RTP)

RTP, or Return to Player, is the percentage of wagered money a slot or game is expected to return to players over time. For example, a slot with an RTP of 96% will return $96 for every $100 wagered, on average.

RNGs ensure that each game outcome is random, but over many plays, the results will average out to the RTP. And while RNGs ensure each play is fair, RTP gives you an idea of how much you can expect to win back over time.

Understanding RTP can help you choose games that offer better long-term returns.

Practical Examples

Here are some practical examples to help you understand the role of RNGs in casino games.

  • Slots: In an RNG slot machine, you might hit the jackpot on one spin, but over thousands of spins, the game’s RTP (Return to Player) and the house edge will dictate the casino’s overall earnings.

    Even if you win in the short term, the house edge guarantees the casino will come out ahead in the long run. The RNG ensures each spin is random, but the game’s design sets the probability of each symbol.
  • Table Games: In blackjack, the RNG shuffles and deals the cards. The house edge is derived from the rules of the game, such as the dealer hitting on soft 17 or the payout for blackjack.

    The RNG ensures the shuffle is fair, but the house edge is built into the game rules and payout structure.

Ultimately, beating an online casino’s RNG system is practically impossible due to the complex nature of algorithmic randomness, the inherent house edge and RTP in every game, and the strict oversight by independent certification bodies.

These factors collectively ensure that outcomes remain unpredictable and fair, with the house edge safeguarding the casino’s long-term gains.

However, there are ways to enhance your gambling experience and potentially increase your chances of short-term success. For example, you can choose high RTP games, use optimal strategies, and manage your bankroll effectively.

Play at RNG Certified Casinos & Start Having Fun!

RNGs are what make online casino games fair and unpredictable. These clever algorithms, along with the house edge, mean that while you can win, the casino will always stay profitable in the long run.

Independent testing and regular checks by trusted agencies add an extra layer of trust.

Understanding how this works helps you gamble online with realistic expectations, make smart choices, and enjoy a more responsible gaming experience.

You can relax knowing that our recommended casinos have been audited and tested for safety, security, and fairness. So get ready for a good time, and sign up now!


Can online casinos modify the RNG software? 

Online casinos cannot change the random aspect of an RNG. The only control they have is using the software to determine the return to player percentage of a game.

How do you know if an online slot machine is not rigged?

To ensure an online slot machine is fair, verify that the casino has a license from reputable regulatory authorities and that its RNGs are certified by independent agencies like eCOGRA or GLI.

Check the slot’s RTP percentage, read player reviews, and browse gambling forums to see what others say about the casino’s reputation. Also, make sure the slot is developed by a well-known game provider.

Are online casino games fair?

While fairness used to be a more considerable concern, now most online casinos subject themselves to rigorous licensing procedures and RNG game audits. As long as you’re playing at a legit, reputable casino, you don’t need to worry.

Are RNGs used at land-based casinos?

Yes, RNGs are used at brick-and-mortar casinos. They are used in modern slot machines, electronic table games, and electronic keno and bingo machines to generate random outcomes.

The use of RNGs at land-based casinos is also regulated and independently tested to ensure compliance with strict standards.

Can you hack RNG software?

RNG software could, in theory, get hacked, but it’s highly improbable since it is such a complex algorithm. That’s not to say people haven’t made attempts.

Computer technician Ron Harris was imprisoned for hacking the Keno algorithm in 1995. However, this is rare as the process is extremely unachievable for most people.

Do online casinos rig their games?

Reputable and licensed online casinos don’t rig their games. They follow strict regulations, use certified RNGs, and get their games from trustworthy developers to ensure everything is fair and transparent.

However, players should stay alert and pick casinos that are licensed and have good reviews to avoid the risks of shady operators.

Also, legit online casinos will not be interested in manipulating their games as they always have the advantage over the player anyway.