Casino Game Fairness: How RNG Testing and Certification Work
Online casino results come from random number generators. Here is how independent labs test them.
Table of contents
Quick answer
Online casino games use random number generators (RNGs) to produce results. In regulated markets, independent testing labs check that the RNG is statistically random and that the game pays back its stated RTP over time, and regulators may require periodic re-testing.
What an RNG does
A random number generator produces unpredictable values that map to card shuffles, wheel results or slot reel positions.
What labs test
- Randomness — statistical tests on very large samples of outcomes.
- Game maths — that payouts match the paytable and the stated RTP.
- Integrity — that results cannot be altered after a bet is placed.
What it means for you
Certification confirms a game works as advertised. It does not remove the house edge.
Frequently asked questions
Who tests casino games?
Independent laboratories accredited by regulators, such as eCOGRA and Gaming Laboratories International.
Does testing mean I will win?
No. It confirms the game behaves as stated, including its house edge.
Sources & references
- eCOGRA www.ecogra.org
- Gaming Laboratories International gaminglabs.com
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