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Guide to Random Number Generators

If you are venturing into online casino gaming in the Philippines, you probably have come across the term RNG. Basically, RNG, or Random Number Generators, are computer programs with algorithms that produce random numbers. These values determine payouts in casino games online and ensure unbiased results. Moreover, gambling law requires all licensed and regulated operators to use RNG software in order to guarantee fair play.

Besides that, third-party authorities regularly test the RNG software of licensed casinos to ensure it’s truly unbiased. However, this doesn’t apply to live casino games since in that case, real dealers facilitate the game. But if you want to learn more about Random Number Generator (RNG) software, this guide is for you. By the end you’ll know exactly how it works and why it’s so important to online casino gaming.

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Online Casinos & Random Number Generators

Before delving deep into how RNGs work, we must first understand what it is. So, Random Number Generators or RNGs are computer software that randomly generates figures or numbers. Basically, the program produces a long series of numbers that are not in any particular pattern or series. Additionally, it provides a single or group of numbers whenever necessary. Although there are many types of RNG software, the most popular are either true random or pseudo-random:

  • True RNG: The True Random Number Generator (TRNG) software depends on physical events with random elements to generate random numbers. As such, it is impossible for players to compromise the numbers because they can not be predicted. 
  • Pseudo-Random Number Generator (PRNG): This kind of RNG relies on an algorithm to create big strings of numbers based on small strings of numbers. 

But regardless of the casino you pick, you will find that most RNG games offer fair outcomes.

How It Works

All online casino games that don’t involve real dealers use PRNG software to constantly produce numbers whenever it is active. So, the numerical values then transform into different elements in the game you are playing. For instance, the program can calculate the symbols that appear on lines in slot machines. Also, in roulette games software establishes where the ball will land after cycling around the wheel. Let’s use an online slot game to elaborate on how online casinos use RNG software.

Say you’re playing a five-reel slot with 10 symbols on each reel. In this case, the RNG assigns a value to each symbol and randomly picks a value of one to 10 of each of the five reels. The outcome is five random symbols assigned independently of each other. If they form a winning combination, you win some cash based on the paytable. Of course, not all but some land-based casino games like video poker and jackpots also use this technology to determine winners. Online slots work like this, and so do games like online roulette, blackjack, etc.

Random Number Generators

Can You Cheat Random Number Generators?

Whether it is possible to cheat Random Number Generators (RNGs) is still contested and has been for many years. In theory, one can cheat the RNG software but not in practice, especially at legitimate real money casinos. Casino providers and software developers make it impossible for the average player to bypass the safety measures. 

Additionally, both traditional and digital casino games of chance depend on randomness and by extension RNG technology. Hence why no player can tell the outcome in slot games or roulette with certainty. So everything comes down to luck or chance, and that’s what makes betting on these games more intriguing. Moreover, third-party agencies regularly test and audit casinos’ RNG software. Some such reputable independent authorities are:

  • eCOGRA
  • Gaming Laboratories International (GLI). 
  • Technical Systems Testing (TST)
  • Gaming Associates (GA)

Of course, getting an RNG certificate is expensive, and it involves a troublesome procedure of verifications. Also, there are policies that the generator must comply with. In other words, if the casino has all the proper licenses you can expect a fair game. But also not cheatable casino games.

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Random Number Generators Affect the RTP

Basically, Random Number Generators pick specific combinations of digits to get a consistent theoretical Return to Player (RTP) percentage. Moreover, every online casino is required to monitor the actual RTP of games to verify that the RNG is unbiased. To achieve this, they divide the overall payout value of the game by the accrued total turnover. 

If the outcome is not proportional to the RTP, the RNG requires auditing and adjustments. But since slots continuously generate numbers, the timing of hitting the spin button affects the outcome in that round. Although the result may be random, a split second can be the difference between a loss and a win. 

How do Casinos Ensure their RNG Is Fair?

Reputable real money casinos use Random Number Generators with third-party authority stamps of approval. So, certificates ensure you can enjoy a fun and fair gaming experience. Moreover, operators follow all these steps to ensure RNG fairness:

  • Regular inspection of the RNG software;
  • Verification and reporting of game payouts;
  • Thorough evaluation of casino games and mathematics;
  • Auditing the poker tables;
  • Hacking testing and security audits.


Whether you’re new to online gambling in the Philippines or not, knowing about Random Number Generators is essential. Simply put, RNGs are a mathematical algorithm that guarantees random and fair results for online casino games. So as long as you play at a licensed and regulated site, you can expect fair software. If you’re looking for a safe gambling destination, try our casino reviews to find the best match for you quickly.


No, you cannot control the RNGs as they are designed to generate random results.

No, live casino games are facilitated by real dealers.

There are many companies that audit RNGs, including eCOGRA, GLI, and TST.

Of course, yes. For example, electronic slot machines use RNGs to determine payouts.

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