Are online slots rigged?
Not at UK-licensed casinos. Slots there must use random number generators tested by approved test houses, and each game’s RTP must be published in its help screen.
By Ryan Jessop. Updated .
Key takeaways
- UK slots use tested random number generators.
- RTP must be published in each game’s rules.
- The house edge is disclosed, not hidden.
- Unlicensed sites have no such testing.
Random number generators
Every spin’s result is decided by a random number generator the moment you press. Past spins have no effect on the next one, and the casino cannot change a result in progress.
Who checks
Gambling Commission technical standards require games to be tested before release by approved independent test houses, and operators must keep them fair. The Commission can and does act against game suppliers that breach technical standards, as it did in 2026.
Why you still lose over time
A 96% RTP slot keeps 4% of stakes on average. That edge is the price of play, published openly; see RTP explained.
Common myths
- “A slot is due to pay.” No: results are independent.
- “Casinos tighten slots at busy times.” Not at licensed casinos; the RTP is set in the game.
More in slot myths debunked.
Slot figures are developers' published defaults, each confirmed against two sources; your casino may run a lower RTP. Offer terms dated 9 October 2026. How we check. 18+. Free help: 0808 8020 133 or safer gambling.
Frequently asked questions
Can a casino change a slot's RTP?
It can choose which approved RTP version to offer, and the figure must be shown in the help screen.
Are free spins less likely to win?
No. Bonus spins run at the same RTP as paid spins.
How do I know a slot is fair?
Play at a UK-licensed casino and check the RTP in the game rules.