Best Online Slots Casinos and Games in the UK 2025

🎰 Theme: Fishing

✅ Four-level free spins bonus with extra wilds and instant cash prizes

✅ Above-average RTP of 96.71% with high volatility

✅ Huge top prize of 5,000x your bet

💰 Best welcome bonus: 50 free spins on Big Bass Splash at LeoVegas

🎰 Theme: Jungle

✅ 4,096 ways to win on every single spin

✅ Free spins with progressive multiplier of up to 15x

✅ Four win modifiers and four fixed jackpots up for grabs

💰 Best welcome bonus: 100% up to £100 at Neptune Play

🎰 Theme: Ancient Egypt

✅ Original game in hugely popular Rich Wilde slots series

✅ Double or nothing gamble feature on every winning spin

✅ Free spins with expanding symbols and 1p minimum bet

💰 Best welcome bonus: 100 free spins on Book of Dead and 100% up to £100 at Duelz

🎰 Theme: Space

✅ Win both ways paylines that double your chances to win

✅ Special Starburst symbol turns reel wild with instant respin

✅ Simple yet fast-paced gameplay is great for slots beginners

💰 Best welcome bonus: Up to 150 free spins on Starburst and 100% up to £300 at Dream Vegas

🎰 Theme: Classic

✅ Massive top prize of 20,000x your bet

✅ Entertaining ‘Pop the Bubble’ bonus round

✅ High volatility for larger payouts

💰 Best welcome bonus: 200% up to £200 at 888 Casino

New slots are added to online casinos on a near daily basis. Playing new slots is a good way to try out the latest features devised by software providers and enjoy recent releases in popular slots franchises, such as the Big Bass and Reel King series. If you’re looking for something different from traditional slots gameplay, new slots are normally the best place to start.

🤩 Popular new slots: Rich Wilde and the Tome of Dead (Play’n GO), Big Bass Bonanza 1000 (Pragmatic Play), Vikings Go to Olympus (Yggdrasil)

Progressive slots feature a live top prize that constantly increases with every real money bet wagered on the game until it’s won by one lucky player. These jackpots regularly hit seven or eight figures, and often offer the largest cash prizes available across an entire online casino. For instance, a UK gambler won £13.1 million playing the progressive jackpot slot Mega Moolah in 2015.

🤩 Popular progressive jackpot slots: King Kong Cash Even Bigger Bonanza Jackpot King (Blueprint Gaming), Age of the Gods: God of Storms (Playtech)

Megaways slots were launched by Big Time Gaming in 2015. They use a special reel layout whereby each of the six reels can display anything from two to seven symbols on every spin. Most Megaways slots therefore offer up to a massive 117,649 ways to win, although some such as Rasputin Megaways have nearly three million. Best of all, Megaways games also replace winning symbols, allowing you to land multiple payouts on the same spin.

🤩 Popular Megaways slots: Cash Strike Hotstepper Megaways, The Goonies Megaways, Eye of Horus Megaways (all Big Time Gaming)

High multiplier slots offer the chance to win 100,000x your bet or more, meaning they award the largest payouts relative to your wager size. This is possible because they have in-game bonuses involving huge and progressive multipliers that can significantly boost your payouts, meaning even the smallest bets are capable of landing big wins. They’re often the slots of choice for minimum deposit players wanting to maximise their win potential.

🤩 Popular highest multiplier slots: Tombstone Slaughter: El Gordo’s Revenge (Nolimit City), Starburst XXXtreme (NetEnt), Peking Luck (Pragmatic Play)

The average return to player (RTP) percentage for online slots is around 96%, so any slot with a higher RTP than this can be expected to pay out more money on average. While you may need thousands of spins to notice the benefit, high RTP slots are still popular with players keen to take advantage of the best win rates. Many UK casinos have slot games boasting RTPs of 98% and more.

🤩 Popular high RTP slots: Ugga Bugga (Playtech), Ju Jungle (Casino Web Scripts), 1429 Uncharted Seas (Thunderkick)

Certain slot games allow you to buy in-game bonuses such as free spins at any time for a set price, instead of having to trigger them as normal with scatters. However, online casinos were banned by the UKGC in 2019 from offering such games, as there were concerns they encouraged problem gambling. As a result, you can only play versions of these slots with the bonus buy feature removed.

🤩 Popular bonus buy slots: Gates of Olympus (Pragmatic Play), Sweet Bonanza (Pragmatic Play), Money Train 2 (Relax Gaming)

Many slots are themed around animals, ranging from those you’ll find on an African safari in Mega Moolah to mischievous bulldogs in The Dog House Megaways. Fishing slots are a particularly popular sub-category on this front, with the Big Bass and Fishin Frenzy series among the most popular slots right now at top UK casinos including MagicRed and All British Casino.

🤩 Popular animal slots: Big Bass Bonanza (Pragmatic Play), Buffalo King Megaways (Big Time Gaming), Wolf Gold (Pragmatic Play)

There are lots of slot games that take you back to the wild west, with symbols and features based around cowboy and cowgirl outlaws, sheriff’s badges and wanted posters. Often, the reels overlook dusty towns and taverns with upbeat folk-based soundtracks to add to the excitement. Coral has over 15 wild west-themed slots to choose from, including Wild West Bandits and 2 Wild 2 Die.

🤩 Popular wild west slots: Wanted Dead or a Wild (Hacksaw Gaming), Duel at Dawn (Hacksaw Gaming), Wild West Gold Megaways (Pragmatic Play)

You can spin the reels with the luck of the Irish on your side, with lots of slots starring leprechauns, four-leaf clovers, pots of gold and other icons of Irish folklore. The Irish-inspired Rainbow Riches slots series is available at top-rated casinos such as Betway Casino and Grosvenor Casino, including Rainbow Riches Megaways, which has a massive top prize of 12,500x your bet.

🤩 Popular Irish slots: Rainbow Riches (Light & Wonder), 9 Pots of Gold (Apricot, formerly Microgaming), Shamrock Saints (Push Gaming)

Ancient Egypt is one of the longest-running slots themes, after initially proving popular at UK casinos with iconic games such as Book of Ra (released back in 2005) and Cleopatra (2012), which are both still among the most played slots by Brits. Today, it’s still going strong thanks to the likes of the Rich Wilde series, which provides fun slots based around pyramids and temples, Egyptian gods, hieroglyphics and more.

🤩 Popular Ancient Egypt slots: Legacy of Dead (Play’n GO), Book of Ra Deluxe (Novomatic), Legend of Cleopatra Megaways (Playson)

There are dozens of online slots set in ancient Greece, featuring symbols and bonuses based around mythical gods such as Zeus and Athena. Among the most popular at UK casinos is Pragmatic Play’s Gates of Olympus series, which has spawned numerous spin-offs such as Gates of Olympus 1000 and Gates of Olympus Super Scatter. Age of the Gods by Playtech is also a beloved progressive jackpot title with slots fans.

🤩 Popular ancient Greece slots: Gates of Olympus (Pragmatic Play), Book of 99 (Relax Gaming), Age of Athena (G Games)

If the likes of ghosts, vampires and dark fantastical characters are your thing, you’re spoilt for choice with the gothic-inspired slots available at UK gambling sites. Many of these boast above average RTPs and maximum wins, most notably Immortal Romance (96.86% RTP and a top prize 12,150x of your bet) and RIP City (96.22% and 12,500x). Software providers such as Hacksaw Gaming specialise in horror-themed slots.

🤩 Popular horror and gothic slots: Immortal Romance (Apricot, formerly Microgaming), RIP City (Hacksaw Gaming), Madame Destiny (Pragmatic Play)