Highest RTP Slots (2025) – Top Paying Online Slots
Looking for the highest RTP slots UK players can try today? We gathered the 10 best payout slots in the UK with verified RTPs and free online demos.
Top 10 Highest RTP Slots 2025
Below we’ve ranked the best payout slots in the UK by RTP, so you can instantly spot which games offer the strongest returns:
| # | Slot | RTP | Max. Win | Where to Play |
|---|---|---|---|---|
| 1 | Book of 99 | 99% | 12,075x | Play on BetMGM |
| 2 | Mega Joker | 99% | 2,000x | Play on PlayOJO |
| 3 | 1429 Uncharted Seas | 98.6% | 670x | Play on BetMGM |
| 4 | Jokerizer | 98% | 600x | Play on Unibet |
| 5 | Big Bad Wolf | 97.34% | 1,224x | Play on Grosvenor |
| 6 | Immortal Romance | 96.86% | 12,150x | Play on Pink Casino |
| 7 | Dead or Alive 2 | 96.82% | 111,111x | Play on NetBet |
| 8 | Football: Champions Cup | 96.82% | 2,000x | Play on LeoVegas |
| 9 | Big Bass Splash | 96.71% | 5,000x | Play on BetMGM |
| 10 | Divine Fortune | 96.59% | 25,000x | Play on All British Casino |
Best RTP Slots UK – Experts Reviews:
Our expert iGamingNuts team have come up with their list of favourite highest RTP slots in the UK. Let’s take a closer look at what they have to offer, and where you can play them:
1. Book of 99: 99% RTP
Book of 99 brings an eye-popping 99% RTP, expanding symbols during free spins, and a wild collection mechanic to trigger bonuses. It’s ideal for bonus wagering and fans of ‘Book of’ slots. Add in a max win of 12,075x, and you’ve got a high RTP game worth spinning.
Provider
Feature score
RTP
99%
Volatility
Medium
Progressive Jackpot
–
Up to £200 Extra + 100 Free Spins
Special Offer
#ad. 18+. Gamble Responsibly. New customers only. Opt-in required. Deposit £10 or more & wager 30x on casino games (contributions may vary) for 100% deposit match up to £200 extra & 100 Free Spins. Free spins on Big Bass Splash worth 10p each valid for 3 days. 7 days to deposit, wager, claim. One offer per player.
2. Mega Joker: 99% RTP
Mega Joker offers a nostalgic, no-frills slot experience with a top-tier 99% RTP. Its Supermeter Mode adds risky, high-reward potentiab, while a progressive jackpot builds the excitement. It’s volatile, old-school, and all about chasing that massive payout: perfect for classic slot lovers and thrill-seekers alike.
Provider
Feature score
RTP
99%
Volatility
High
Progressive Jackpot
£3%
80 Free Spins (no wagering)
Special Offer for iGamingNuts users
#ad. 18+. Gamble Responsibly. Offer only available to first-time depositors who register at PlayOJO via the iGamingnuts link. Free spins on Big Bass Bonanza, worth 10p each. Min. deposit £10..
3. 1429 Uncharted Seas: 98.6% RTP
Not the highest win potential on this one, with only a 670x max win, but low volatility ensuring frequent wins. A perfect nautical slot for casual players who don’t want to take too much risks.
Provider
Feature score
RTP
98.6%
Volatility
Low
Progressive Jackpot
–
Up to £200 Extra + 100 Free Spins
Special Offer
#ad. 18+. Gamble Responsibly. New customers only. Opt-in required. Deposit £10 or more & wager 30x on casino games (contributions may vary) for 100% deposit match up to £200 extra & 100 Free Spins. Free spins on Big Bass Splash worth 10p each valid for 3 days. 7 days to deposit, wager, claim. One offer per player.
4. Jokerizer: 98% RTP
In the same vibe as Mega Joker, this slot is super simple, without many features. Simply spin your reels and enjoy the high RTP for a low-risk gameplay!
Provider
Feature score
RTP
98%
Volatility
High
Progressive Jackpot
–
Deposit £10, Get 250 Free Spins – No wagering
#ad. 18+. Gamble Responsibly. New GB customers only. Deposit and stake £10 (debit cards only) on Casino Slots and claim up to 250 spins over 5 days. Max 50 spins each day. New customers must opt in on registration and use within 7 days. Free daily spins expire after 24h. Free Spins: £0.10 each, selected games only. T&C’s apply.
5. Big Bad Wolf: 97.34% RTP
Big Bad Wolf mixes fairytale charm with smart features like Swooping Reels and Wild Pigs that ramp up your win potential. With a max RTP of 97.34% and iconic visuals, it’s perfect for players after low-pressure fun, though big-win hunters might find the 1,225x max a bit underwhelming..
Provider
Feature score
RTP
97.34%
Volatility
Medium
Progressive Jackpot
–
Play with £50 when you deposit £20 +100 FREE SPINS
#ad. 18+. Gamble Responsibly. Min. first deposit of £20 (excluding paypal and paysafe) to receive a max bonus of £30 with 30x wagering and £2000 max win. 100 free spins worth 10p each on selected slots. 1x wagering with £500 max win. 7 day expiry.
6. Immortal Romance: 96.86% RTP
Immortal Romance is one of the most popular online slots for UK players, and it is easy to see why. Its high RTP of 96.86% combined with medium high volatility, a 12,150x max win and five exciting bonus features give it widespread appeal. However, its gothic vampire theme won’t suit everyone and you have to play a long time to unlock all of its features
Provider
Feature score
RTP
96.86%
Volatility
Medium
Progressive Jackpot
–
Bet £10, Get 50 Free Spins – No Wagering
#ad. 18+. Gamble Responsibly. New accounts only. Opt in and deposit £10 and wager 1x in 7 days. Receive 50 Free Spins on Big Bass Splash at value of 10p. Game contributions vary. 3 day expiry.
7. Dead or Alive 2: 96.82% RTP
Dead or Alive 2 is a legendary high-volatility slot with jaw-dropping win potential (up to 111,111x). It delivers three distinct free spins features, slick Wild West visuals, and a sharp 96.82% RTP. If you love intense spins and epic risks, this cult sequel is a must-play.
Provider
Feature score
RTP
96.82%
Volatility
High
Progressive Jackpot
–
Bet £10, Get 200 Free Spins – No Wagering
#ad. 18+. Gamble Responsibly. New customers only. Register and enter promo code SPINS prior to deposit. Deposit, using a Debit Card, and stake £10+ within 14 days on Slots at Betfred Games and/or Vegas to get 200 Free Spins on selected titles. £0.10 per spin. Credited within 48 hours and valid for 7 days. Full T&Cs apply
What is a High RTP Slot?
If you’re new to playing slots, and have no idea what RTP is, here’s a quick overview to get you up to speed.
Understanding Return To Player (RTP)
In online slots, the RTP shows the percentage of bets which goes back to players. Let’s take the example of a game with a high RTP of 98%. It basically means that, on average, a player wagering £100 on the game can expect to get £98 back. Therefore, a player should expect to get a better return a slot with a 98% RTP than one with a 92% RTP.
However, this metric needs to be put into perspective. Although RTP is a good indicator of how a slot pays out, you should remember that it’s only an average. Every slot is tested over millions of spins to get the overall return percentage. You are, in no way, guaranteed to get that amount back for every £100 you wager!
RTP vs. Volatility
Return To Player shows how much a slot pays back on average, while volatility is more of an indicator of “how” it pays. It shows the frequency of wins, and their average amount. For example, a low volatility slot is more likely to reward players with small, regular wins, while bigger payouts might be quite hard to get. High volatility slots, on the other hand, can bring long losing streaks but when a win occurs, it is usually higher than average.
How is RTP in Slots Calculated?
Slot RTPs are calculated using simulations run over millions of spins. Developers use random number generators (RNGs) to test payout ratios across all possible outcomes. The final RTP is then set based on the average return. While some providers publish a fixed RTP, others offer adjustable RTP ranges, so casinos may offer different versions of the same slot. Always check the RTP in the game info screen, so you know exactly what RTP version you are playing.
RTP in Jackpot Slots
In slots with a progressive jackpot system, part of every bet goes into the jackpot total. This means that unless you win the big prize, you’ll lose a small percentage of every wager you place.
This translates into jackpot slots having lower RTP than most games. While the average Return To Player is somewhere around 96%, with some as high as 99%, jackpot games usually have RTPs of 94% or below. These low RTPs are balanced by the possibility of winning some huge jackpots, but you’ll obviously need a lot of luck to get that sort of prize!
However, there are some exceptions to this rule. As mentioned earlier, Mega Joker and its 99% RTP offers a progressive jackpot as well! So, always check for the RTP before you make your decision.
Highest RTP Slots Tips & Strategies
Although the highest RTP games pay out more on average, the best online slots in the UK are still based on luck, so no win is guaranteed. However, there are some ways to play smarter and maximise your gameplay.
These tips are more general advice for you to come prepared to your next session on high RTP slots:
- Set a budget and stick to it, especially if you end up losing it all.
- Use free spins and casino promotions, including potential no-wagering bonuses, for some risk-free gameplay.
- Check the game info to see if the version you’re playing is the right one. If it’s the correct RTP, make sure the RTP is available in the base game not only in certain modes.
By following these few tips, you should be able to enjoy longer, low-risk sessions!
Where to Play High RTP Slots Online
Here is a selection of some the best UK slot sites where you can enjoy high RTP games and the best payout slots:
See the key factors behind the iGN Rating for Betfred Casino:
- Safety Index: Excellent – Fully licensed by the UKGC, transparent payments, responsible gambling tools and an extensive choice of customer support options.
- Advantages: Betfred offers a large game catalogue of over 2,700 games, with fast withdrawal times and regular bonus offers.
- Disadvantages: Confusing Tabs for Casino, Games and Vegas, live chat queues, no loss limit tool.
Minimum deposit: £5
General number of games: 2700
Payment speed: 4-6 hours
Free spins: 200 Free Spins
Win Up to 50 Free Spins a Day
Bet £10, Get 200 Free Spins – No Wagering
See the key factors behind the iGN Rating for BetMGM:
- Safety Index = Excellent – BetMGM Casino is licensed by the UKGC and provides strong encryption. Extensive documentation and tools are available for Responsible Gambling.
-
Advantages: Large live game selection, with exclusive tables and Las Vegas dealers, 24/7 customer support via live chat, and fast withdrawals. The welcome bonus comes with low wagering requirements (1x).
-
Disadvantages: No Phone or Email support, lack of promotions for existing players, not many payment methods available.
Minimum deposit: £10
General number of games: 3000+
Payment speed: Instant to 3 days
Free spins: 100 Free Spins on Big Bass Splash
Up to £200 Extra + 100 Free Spins
Special Offer
See the key factors behind the iGN Rating for Grosvenor Casino:
- Safety Index = Excellent – Grosvenor Casino is fully licensed by the UKGC, adheres to eCOGRA standards, and provides robust responsible gambling tools. With top-tier security measures in place, it stands out as one of the safest online casinos.
- Advantages: The low £5 minimum deposit (except for PayPal), a wide range of promotions including live dealer offers, exclusive live games streamed from Grosvenor’s land-based casinos, and a strong reputation as a trusted UK brand since 1970.
- Disadvantages: Limited withdrawal options with only four available, Live Chat support restricted to 07:00 – 22:30, and a relatively modest welcome bonus capped at £30.
Minimum deposit: £5
General number of games: 1000
Payment speed: Instant to 3 days
Free spins: 100 Free Spins
No deposit bonus: Grand Prize Wheel
Play with £50 when you deposit £20 +100 FREE SPINS
Conclusion
High RTP slots are the smart player’s choice for better long-term value. While they don’t promise wins, they do offer better returns on average than lower RTP alternatives. When combined with a few simple strategies, sessions on games like Mega Joker and Book of 99 can last a lot longer than expected.
If you want to test a specific game before playing for real money, we’ve got a big selection of free demos available for you in our slot reviews.
FAQ – Highest RTP Slots UK
What is the highest RTP in slots?
Anything well above 96% can be considered a high RTP, with the highest RTPs being at 99%.
What slots have a 99% RTP?
Book of 99 and Mega Joker are two slots with a 99% RTP, making them the highest RTP slots for UK players.
Can I win more on high RTP slots?
Over time, yes, high RTP slots pay back more on average. But the outcome still is random, and no win is guaranteed.
Does high RTP guarantee a win?
No, a high RTP doesn’t mean players will win at online slots. It’s just an average return one can expect for its wagers.
Where can I play the best paying slots?
Lots of trusted online casinos in the UK, including NetBet, LeoVegas, or PlayOJO, offer high RTP slots.
I wouldn’t place The Doghouse Megaways among the best-paying slots, as its RTP isn’t very high. Also, from my experience it’s quite hard to get the free spins, so I suggest you to find better games for the benefit of players. Thanks.