What Random Number Generators Do - RNG in Online Casinos
- RJ Digital SIA
- Sep 2
- 5 min read
If you've ever wondered how online casino games keep fair or if they are even fair at all, you may have heard the term "Random Number Generator" (RNG). It looks hard and dangerous, but if you've never gambled online before, you need to know what it is.
RNGs are what really make any online casino game run. They are what makes it impossible to forecast what will happen when you spin a slot machine, why roulette seems truly random, and why blackjack hands don't just keep repeating the same pattern.
But what is a RNG, how does it work, and why should you trust it? Let's go one step at a time.
What is a RNG in Online casino?
A random number generator (RNG) is basically a computer program that gives you random outcomes. It is in charge of these things in online casinos:
Picking which symbols appear on a slot machine reel
Choosing the next card in poker or blackjack
Playing roulette on the internet
Even running virtual dice games, keno, and scratch cards
Imagine that the dealer is behind the screen and is in charge of making sure that every spin, card, or roll is fair and random.
The Two Types of RNGs in Online casino
RNGs are not all the same. One of these two systems is used by most online casinos:
1. TRNGs, which stands for True Random Number Generators
They are based on random occurrences that happen in the real world, such noise in the air or radioactive decay. It's hard to guess when they'll happen, but online casinos don't employ them very often because they need special equipment.
2. Pseudo-Random Number Generators (PRNGs)
Most online casinos use this. A PRNG employs seed numbers and algorithms to make outcomes that seem random. Players still can't guess what will happen, even if it's "pseudo-random" because it's based on a formula.
Independent groups periodically check PRNGs to make sure they work fairly.
How online slots use random number generators
Slots work because of RNGs, and they are the most popular games at online casinos.
When you hit "spin," this is a simple way to explain what happens:
The RNG creates thousands of number sequences per second, even when you're not playing.
When you click "spin," the RNG locks in on a specific order.
That arrangement is the same as where the reels are.
You can see the outcome immediately away on your screen.
This means:
There is no "memory" of spins that have already taken place.
You can't know when a slot machine will "pay out."
Every spin is different and has the same chances as the one before it.
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Why RNGs Are Necessary for Fair Play
RNGs are what keep internet casinos from being unfair. If they didn't have them, a casino could easily manipulate the results to make them look better. Instead, authorized casinos must use RNGs that have been tested and approved by independent authorities.
These are some well-known companies that do testing:
eCOGRA is short for eCommerce Online Gaming Regulation and Assurance.
Gaming Labs International (GLI)
iTech Labs
These companies test a lot to make sure:
The RNG doesn't provide the house more of an edge than usual.
It's quite hard to forecast what the results will be.
The games do what they say they will do
A casino gets a certificate that proves its games are fair if it meets certain conditions.
What People Don't Get Right About RNGs
A lot of people have false views about RNGs, much like they do about casinos. Let's make some of them clear:
Myth 1: RNGs make it impossible for players to win
RNGs are made to give random results, which is the truth. The house edge, not changing the RNG, is how casinos make money.
Myth 2: "Flipping a switch" lets casinos control the results.
The truth is that licensed casinos can't change the random number generators. If they did, the government would shut them down.
Myth 3: If you play long enough, you will see patterns.
Truth: Players can't figure out how RNGs operate.
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RNGs in Games at the Table
RNGs are not only utilized in slots. This is how they function in well-known table games:
The RNG in roulette picks where the virtual ball will fall.
The RNG chooses what sequence the cards are dealt in blackjack. This is like shuffling a deck.
RNG makes ensuring that each player's hands in poker are fair and random.
Even in live dealer games, RNGs can still be used for things like bonus rounds and automatic wheels.
RNGs and Progressive Jackpots
RNGs are also very important when you play a progressive jackpot slot. Every time you spin, a small portion of your stake goes toward the jackpot pool. Then, the RNG determines a random moment for the jackpot to go down.
This is why jackpots can drop after a few days or even a few months. They don't have a set time to come, and no one knows when they will.
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How to Know If an Online Casino's RNG Is Fair
When you're first starting out, you don't need to know how RNGs function on a technical level. You need to know how to make sure you're in a safe environment to play.
Here's a short list:
A well-known organization, such the UKGC, MGA, or Curacao, has given the casino a license.
Independent labs like eCOGRA check the games.
The casino either indicates how much it pays out or cites its RNG certifications.
Players' reviews don't say anything about unfair practices.
If a casino does these things, you can trust the RNG.
How to Play Smart with RNG Games for Newbies
You can't change the results of a random number generator (RNG), but you can still make your experience better:
Learn what RTP (Return to Player) is: Choose slots with higher RTP rates. In the long run, they give players more back.
Don't chase losses; the RNG's results don't change just because you've lost a few times. Every time you spin, it's different.
Be Careful with Bonuses: Bonuses at casinos can provide you additional time to play, but you should always read the restrictions first.
Before you play, make a budget and stick to it to practice managing your money. RNG doesn't give in to need.
Play for Fun, Not Money: RNG makes sure that the game is random, so you can't win every time. Think of it as fun.
Filan toughts
Not knowing what will happen next is exciting, and that's how it should be.
