Online Slots Casino: Compare the best online slots casinos in the UK 2025

UK online slots players often begin their search for a new casino by looking at the welcome bonus. And the good news is that most welcome bonuses are great for UK players wanting to play slots online. Here, then, we're looking for multi-part bonuses with a healthy dose of free spins for some of the most popular slots – and low wagering requirements too (see below).

Free spins for some of the industry's best slots will be included in the welcome bonus. We're talking video slots in the main. Jackpot slots clearly won't be included in free spins bonuses (imagine someone winning millions of pounds for free!). But we always look for regular free spins promotions on a weekly basis too. This is especially useful when trying out new slots.

New customers can struggle to wrap their heads around wagering requirements. Therefore, we expect online casino deals to be written in plain English. Also, we want to see standard wagering requirements of around 35 times the bonus amount – when it's also applied to the deposit, we suggest walking away. The same goes for when the wagering is in excess of 35x.

New customers looking to play slots online want a stellar game selection from which to choose. This should include classic slot machines, video slots and jackpot slots. And these should come from some of the best developers on the planet. Therefore, we always want to find not only a large selection of online slots but also that the top quality providers are on board.

Having hundreds or even thousands of top online slot games is all well and good. But many UK players also want to mix things up from time to time. Therefore, other casino games should be plentiful. We're talking online roulette, blackjack and baccarat for starters. And a casino site will always get bonus points for serving up live casino games, poker, bingo and sports betting.

While casino bonuses and popular games take all the headlines, ensuring that your preferred payment method is supported is vital for a good experience. We check things like whether or not a payment method is accepted for welcome bonuses, if any fees are charged and if the withdrawal times are within industry standards. All these things can impact your game time.

Shit happens. And when something goes wrong in the middle of the night, you'll want to resolve that issue as soon as possible. Having a knowledgeable, friendly and prompt customer support team on your side is key. That's why we routinely test response times and answers. And there are bonus points for 24/7 support via live chat, email and a UK freephone number.

We won't touch unreliable and blacklisted sites with a barge pole. And you shouldn't either. That's why we always look for full encryption across all pages of an online casino. Without these basic protocols, you could be risking your personal or financial data. On the same note, we will praise any site that offers two-factor authentication to help protect customer info.

A site targeting UK players without a casino license from the esteemed UK Gambling Commission is a huge red flag. The UK Gambling Commission works tirelessly to protect online casino players from rogue actors. That's why we go looking for a valid UKGC license before even considering a site for inclusion in our expert online casino reviews section.

Classic slots (commonly known as fruit machines in the UK) are based on the one-arm bandits of yesteryear. They have a retro feel and symbols comprised of traditional fruits, BARs and bells. They are dead simple too – often only featuring a single payline in the middle and little to no bonus rounds. Because of this, they offer an easy route for beginners to play online slots.

The most common form of slot is the video slot. They can be simple or vastly complex. Some feature thousands of paylines (such as the Megaways slots), while others throw in different bonus rounds that are mini-games in and of themselves. The game mechanics are just as weird and wonderful, too, with things like cascading reels and huge multipliers adding excitement.

Similar to video slots, branded slot machines go one step further. They are tied to huge media franchises. For example, TV shows like The Walking Dead and Rick and Morty, movies like The Lord of the Rings and Gladiator and famous artists like Guns N' Roses and Jimi Hendrix. And because branded slots have much more money behind them, the quality is extremely high.

Progressive jackpots are what you read about whenever there's a big win. That's because a small amount of each wager is added to a prize pool over weeks or months from linked video slots all over the world in thousands of online casinos. In turn, this means some progressive jackpot slots like Mega Moolah and Mega Fortune offer millions of pounds in prizes on a single spin.

Lastly, there's a new breed of online slots based on the same blockchain technology that powers Bitcoin casinos. You may, in fact, see these games given the name Provably Fair. That's because blockchain technology is basically a write-only digital ledger or spreadsheet showing every transaction. In this, way every single spin on a crypto slot can be tracked and traced.

Swedish games provider NetEnt (formerly Net Entertainment) is one of the biggest and the best in the gambling industry. After two decades, the company has been bought out by Evolution Gaming but still operates more than 200 high-quality slot games. Its biggest hits include Starburst, Mega Fortune, Blood Suckers, Gonzo's Quest, Divine Fortune and Narcos.

Microgaming helped kickstart the online casino slots industry from the Isle of Man back in 1994. It has since gone on to produce some of the best progressive jackpot slot games and video slots. Plus its titles show up in thousands of UK online casinos. Here's a taster of that prolific output: Mega Moolah, Book of Oz, Jurassic World, Thunderstruck II and Bonanza Megaways.

Founded in Estonia in 1999 and now headquartered in the Isle of Man, Playtech is one of the largest games providers on the planet. In fact, the company goes far beyond slot machines and into poker, bingo and sports betting too. As for a few recommendations on the slots front, try out Age of the Gods, Gladiator: Road to Rome and Frankie Dettori's Magic Seven for starters.

Based in Reno, Nevada, International Game Technology (more commonly known as IGT) got its start making physical slot machines for casinos around the world. With the popularity of online slots taking over from slot machines, IGT ported their best slots over to online casinos. Top IGT slots include Cleopatra, Da Vinci Diamonds, Pixies of the Forest, Wolf Run and more.

Based in Gibraltar, Pragmatic Play works with many of the best online casinos, providing online slot games in a variety of genres. The company has won numerous gambling industry awards for its innovative features and top-quality video slot and jackpot slot games. Be sure to check out Wild Wild Riches, The Dog House, Fruit Party 2, Chicken Drop and Lucky, Grace & Charm.

Austrian slot game manufacturer started back in 1980. So, it has plenty of experience building slot game cabinets. Taking that knowledge and huge games portfolio into the online casino world was a natural move, especially after a series of high-profile mergers and acquisitions. Here's a taste of its slot menu: Book of Ra, Pharoah's Tomb, Sizzling Hot and Lord of the Ocean.

Founded in 2006, this Malta-based games provider has gone on to produce more than 200 high-quality slot games and jackpot slots. One thing you can be certain of with Betsoft slots is the brilliant graphics, making them a joy to play. And if we had to choose which slots to showcase, we'd go with SugarPop, Back to Venus, Primal Hunt, Tower of Fortuna and A Night in Paris.

Plucky Swedish games provider Play'n GO has offices in various gambling hotspots around the world, including Malta and Gibraltar. Utilising a startup mentality, the slot game provider has quite a few tricks up its sleeve for producing engaging and unique casino games. Be sure to sample the likes of Book of Dead, Reactoonz, Moon Princess, Honey Rush and Golden Colts.

Launched in 2011 in New South Wales, Australia, Big Time Gaming (or BTG for short) is synonymous with innovative slot game mechanics. For example, the team created the Megaways concept, which is now licensed by other slot providers. BTG produces top slots of its own too: Bonanza Megaways, White Rabbit, Lil' Devil, Extra Chilli and Who Wants to be a Millionaire.

Last but not least, we wanted to highlight the gorgeous online slot games of Malta-based Yggdrasil. The superbly crafted titles in the Yggdrasil portfolio will make you want to continue playing into the wee hours (as we often do ourselves). To get started, check out the likes of Jungle Books, Double Dragons, Orient Express, Vikings Go Wild and Holmes & the Stolen Stones.