How do casinos online generate numbers randomly during the games of slots, Roulette, and video poker? Learn more about the RNG.

Random Number Generator

If you have played at an online casino, you must have read somewhere the acronym "RNG" and perhaps have wondered what that stood for. In this article, we would like to explain what RNG means, so that you understand what the casino people are talking about the next time you play online.

Basically, RNG stands for "Random-Number Generator" and its job is to control the numbers being generated by a casino during the different games of Roulette, slot machines, or video poker. As you can see, the RNG performs a fundamental function, since every possible number combination of a casino game depends on it. In a nutshell, RNG determines the outcome of every wager. Needless to say, the numbers are generated randomly by this device and can not be predicted in any way.

How does RNG apply to online casinos

The random-number generator can be thought of as a program running inside the online casino you have selected. This program starts sending its results to the software used by the casino you are playing at. There are several software houses employed by the many operators out there. The most popular ones are:

  • Playtech
  • Microgaming
  • NetENT
  • BetSoft
  • Everymatrix
  • Novomatic
  • IGT

To know more about the several software houses available, please take a look at the page dedicated to them.

How safe is the RNG?

RNG is very safe. You need to know that this system starts with just a number and then employs a sophisticated algorithm similar to the Google algorithm to generate another number. Then, a new number is produced by taking the last one into consideration. These numbers are huge and can not be predicted by anybody; in fact, a very popular random-number generator employed by industry leaders feature almost 200.000 digits. That's a big number for sure.


We are players too and we know what you are thinking: "Yes, that's a big one but…can I trust the system 100%?". That is a fair question. As for the online casinos we have selected and displayed on this site, we always look at the governmental licenses that an operator has in order to ascertain the safety it can provide to our readers. Similarly, we also consider only those casinos whose RNG systems have gained the eCOGRA certification.

eCOGRA is the acronysm for "E-Commerce and Online Gaming Regulation and Assurance". This is the authority that checks on the online casinos and makes sure that they operate in a fair and loyal manner: we want you to play at the casinos that have received the eCOGRA certification, as they are honest and loyal.

Last update: 30-09-2019