Gambling terms, explained straight

Online Gambling & Industry

RNG certified meaning

An RNG certified label on a slot or casino game means an independent lab has checked its random number generator and confirmed it meets the required fairness standards.

Applies to
Slots, casino games, bingo, virtual betting, virtual sports, video poker42
Standards
Output must be acceptably random, uniformly distributed, unpredictable, and non-cycling3
UK requirement
Remote licensees must submit RNG test results from approved test houses before release5

Key points

  • A test lab checks the RNG algorithm and game outputs using statistical analysis to verify randomness and fairness.1
  • In slots, the RNG determines reel symbols and each spin is independent of previous spins.1
  • RNG certified differs from RNG meaning: the latter refers to the concept of random number generation, not independent testing.4

Where this term is used

Online RNG meaning Explains the concept of a random number generator itself, without reference to certification. Online RNG meaning luck Explains how RNG is used colloquially to mean luck or chance in gaming. Online UKGC licence A UKGC licence is an operating licence from the UK Gambling Commission Online Crypto casino A crypto casino is an online gambling venue Online KYC meaning KYC stands for Know Your Customer Online Gambling commission A gambling commission is a fee or charge deducted by an operator or intermediary from a stake

Sources

  1. Ensuring Fair Play with RNG Testing and ... ecogra.org Explains how test labs check RNG algorithms and game outputs for randomness and fairness.
  2. eCOGRA Certification | International Test Lab | Learn More ecogra.org Lists the types of games that RNG certification applies to.
  3. Regulatory returns guidance - 2 - Random number ... gamblingcommission.gov.uk Provides the UK standard that output must be acceptably random, uniformly distributed, unpredictable, and non-cycling.
  4. Remote gambling and software technical standards (RTS) - 2 gamblingcommission.gov.uk Confirms that RNG determines reel symbols in slots and that each spin is independent.
  5. Games test reports (remote gambling and gambling software) gamblingcommission.gov.uk States that UK remote licensees must submit RNG test results from approved test houses before release.

Sources are drawn from regulators, universities and published research, and each one is labelled with what it actually is — a preprint is not called a paper. Bookmaker and affiliate pages are never cited here, because a page that sells betting is not a neutral authority on it.

Written and maintained by Ellis Warrender, writer and maintainer.

Last updated 28 July 2026. Spotted an error? Tell me and it gets fixed and logged on the corrections page.