Best Betting Sites With Slots In 2021

Online slots are easy to play which, when applied to the huge prizes potentially on offer, makes it easy to see why these games and the myriad of slots betting sites out there tend to do so well. All players are required to do is spin the reels and see what Lady Luck delivers.

Since they first came into public awareness in San Francisco in 1895, when Charles Fey launched his Liberty Bell fruit machine, slots have grown in popularity at a phenomenal rate. Today, they are widely accepted to be the most popular games within an online casino, attracting millions of players a day all over the world.

Best Betting Sites We Recommend for Online Slots in 2021

  • Wide range of slots
  • Pays out progressive jackpot wins in one hit
  • Up to £50 new player bonus

New Games customers only. Deposit/transfer between £10 and £50 to claim. Wager 30x on eligible games. Bonus will be matched to qualifying deposit. Time limits, game restrictions and T&Cs Apply.

Paddy Power
  • Over 200 casino games
  • Exclusive slots promotions
  • 100 Free Spins sign up offer

1) To take part, you must register via the registration code PGCTV1 and opt in. 2) Get SMS-verified by supplying a valid telephone number. 3) Enter the validation code received by SMS to redeem the free spins. 4) Free Spins are valid on any of our Daily Jackpot games. 5) Free Spins will expire in 10 days from receipt of the offer.

William Hill
  • Top quality graphics, sounds, and animations
  • Over 300 popular slots games available
  • Bet £10 Get £30 in free bets Credited as 2 x £15 bets

Opt in required. New customers only. 1x per customer. Min. £10 deposit. 1st deposit only. Games only. Max. Bonus £30. 40x Wagering. Max. Redeemable £2,000. Bonus expires after 7 days. Game weighting, game, country, currency, player restrictions and terms apply.

  • Very user-friendly casino platform
  • Slots promotions staged regularly
  • Stake £10 and get 100 Free Spins on Starburst

New customers only. Register with code GAMES100. Deposit using debit card only and stake £10 or more on slots to receive 100 Free Spins on Starburst. Free Spins credited within 48 hours. Free Spins are valid for 7 days. SMS validation may be required. Further T&Cs apply.

Mr Green
  • Over 300 slot games available
  • Owned by the highly respected William Hill
  • Deposit & Stake £30, get 10 free spins daily on Starburst

Opt in required per day. 1x per customer per day. Starburst™ only. Deposit and stake Min. £30. Max 10 spins at £0.20/spin per opt in. 35x wagering. Free spins expire 24 hours from issue. Game, country, currency, player restrictions and terms apply.

  • Over 600 games to choose from
  • Great mobile casino app
  • Up to £70 in welcome bonuses

New customers. £70 bonus = 2x £20 bonus + 3x £10 bonuses for selected games, up to 60x wagering. Bonuses expire in 3 days. Card Payments only. Wager £10 within 7 days of registration. Geo Restrictions. Full T&Cs apply

  • Over 550 casino games
  • Playtech Casino
  • £50 casino sign up offer

18+. New Casino players only. Deposit required. Min stake £10 on qualifying games. 40x wager reqs (bonus only) on selected games. 24hrs to accept. Bonus valid for 48hrs. Certain deposit types excluded. Bets covering >70% of Roulette table excluded. T&Cs Apply.

  • Casino club card with exclusive promos for their UK land-based casinos
  • Great range of slots
  • Welcome bonus of 100% up to £200

New customers £20 - £200. 20 x wagering on deposit and bonus total (% game weightings and play restrictions apply). Selected games only. Max bonus bet £5 (£10 live casino) 15 days to accept, 40 to complete. Excludes customers from Northern Ireland.T&C’s apply.

  • Large amount of slots promotions
  • 150% up to £150 welcome bonus
  • Over 600 games to choose from

18+ New accounts only. Min. £10 deposit, debit card only. Up to 50x wagering, game contributions vary, max. stake applies, 7 day expiry. See full terms. #AD"

  • Offers more than 200 different slots
  • Develops its own casino games
  • 100% up to £100 in deposit bonuses + £30 Extra Bonus

100% up to £100 on 1st deposit + £30 extra instant bonus • £20 min deposit with code live30 •  Bonus wins capped at £500 • 30x wagering for the first 100% up to £100 and 50x for the extra £30 bonus – req. vary by game – in 90 days • UK only - deposit balance is available for withdrawal at any time • Withdrawal terms & T&Cs apply

Best Online Slots Sites – Top 10

#01 Bet365

#02 Paddy Power

#03 William Hill

#04 Betfred

#05 Mr Green

#06 BetVictor

#07 Ladbrokes

#08 Genting

#09 32Red

#10 888sport

Best Slots Betting Sites Ranked & Reviewed

Bet365 Online Slots Review

Bet365 runs exclusively on the Playtech platform, a software company that is famous for its incredible range of slots. It offers a huge selection of slot games with over 100 titles, including fun favourites such as Rainbow Riches, Fishin’ Frenzy and Book of Irish. Often, the world’s best slots betting sites will host slots specific promotions such as free spins, leaderboards and the highly coveted Million Pound Slots Giveaway.

Paddy Power Online Slots Review


Paddy Power featured online slots


Paddy Power won the 2019 slots operator of the year award, so you have every right to expect their slots offering to live up to its billing. Among the games, of which there are more than 200, are a wide selection of Megaways titles too for those looking for the juicy progressive payouts.

William Hill Online Slots Review


William Hill casino screenshot of online slots


At William Hill, players are able to access more than 300 slots to choose from. The betting operator often runs slots promos and there are daily jackpots to one as well as the free-to-play daily game Bonus Drop. Games on offer include Frankie Dettori’s Magic Seven, Plenty O’ Fortune and Rocky.

Betfred Online Slots Review


Betfred screenshot of online slots


Betfred are another one of the biggest slots betting sites with a vast amount of slot games on offer, including 45 progressives. With plenty of Megaways slots, Must Drop Jackpots that are won frequently, those that enjoy the higher paying slots will not be disappointed, especially if they take the 50 free spins on offer when they sign up and deposit £10.

Mr Green Online Slots Review


Mr Green screenshot of online slots


At Mr Green, slot players are able to pick their favourites from three reel or five reel video slots, plus enjoy access to thrilling progressive slots such as Hall of Gods and Arabian Nights, with each offering potentially life-changing jackpots paying out in millions. Plus, as part of the William Hill group, you have added assurances of their reputation.

BetVictor Online Slots Review


BetVictor online slot games - screenshot


BetVictor provides for more than 500 slots that have been lovingly and painstakingly created by more than 30 different software providers. Here, you will find lots of popular games from leading manufacturers, including Microgaming and NetEnt. Jackpot players will also have a wide choice of progressives to enjoy. Rainbow Riches, Mega Jade and Big Kahuna can all be played here as can more than 40 Megaways titles.

Ladbrokes Online Slots Review


Ladbrokes screenshot of online slot games


Ladbrokes as the leading online bookmaker provides an online casino that is fully loaded with a strong range of slot machines from PlayTech. Best of all, a fantastic welcome offer awaits for those that want to try the Ladbrokes online casino with its bumper selection of online slots, many of which are progressives.

Genting Online Slots Review


Gentingbet online slots


At Genting, Playtech and IGT provide most of the slots fun which all feature some of the sharpest definition graphics that can be found in an online casino. Happily, they also have provided some excellent progressive jackpots too across their network of operators. Plus, these are a casino operator that have a chain of UK land-based casinos, where membership to both brings rewards.

32Red Online Slots Review


32Red slots betting sites


Despite their Roulette-based name, online slots are where 32Red really come into their own. These games actually form the majority of the games here with more than 450 available to play day and night. The range is great and the site, which was an online casino first, is very user-friendly making it easy to find games such as Starburst, Gonzo’s Quest and Fishin’ Frenzy with minimum effort.

888sport Online Slots Review


888casino slots betting sites


888sport’s casino (888casino) offers up more than 200 slots to choose from, including ones that they have developed in-house. As one of the biggest operators on the market, you can rest assured that you are playing safely here, where you will find many familiar titles including a good range of progressive jackpots.


How to Choose The Best Online Slots Sites

When you are looking for the perfect betting sites with slot games, there are certain considerations that you need to think about before depositing at a site. Two of the most prominent issues are online safety and fairness of play, which we explore in more detail below.

Are Online Slots Fair?

Online slot games, like most casino games, come with an advantage applied to the house, known in the game as house edge. Despite this, players will almost certainly pick up a winning spin or two regularly over five or so spins. This is because casino games employ Random Number Generators (RNGs) to ensure every spin is random and has the same chances of success as each of your other spins, future or past. At the end of the day, slots are games of chance, and a casino will not benefit from any short-term, one-off success enjoyed over players. Instead, online casinos will do much better long-term by encouraging repeat business and making a wider profit. Rigging games would not only lead to customers avoiding their casino site but also alert the relevant authorities.

Are Online Slots Safe?

The question of whether or not the slot game you are playing is safe very much depends on where you are playing it. By ensuring that you choose to deposit and play at an online casino that is fully licensed by the appropriate gaming authority, you should not have any issues to worry about. If the casino is licensed, then it will be utilising all of the very latest security protocols and procedures to ensure that it is safe for all of its players.

Why Play Slots Online?

There are a whole host of reasons that people love to play on slots betting sites, but perhaps the most important point to note is that there is next-to-no skill needed to get started playing. Online slots, which can be played anytime, anywhere, also provide endless hours of entertainment, come with brilliant and exciting themes and, critically, come with massive jackpot potential, especially if you are playing progressive jackpots games.


How to Play Online Slots

While there are many different types of slots, they all really work in pretty much the same way. This is to say that all slots have reels with symbols on that spin downwards on the grid. Where the symbols land in relation to each other on each spin is what dictates what players will win.

In modern-day online slots, there are many different ways these games can play or payout, and they each come with a range of bonus features. While some are played on three reels, others have five reels; but, at the end of the day, all slots are about the forming of winning combinations.


Online Slot Types

There are more than one type of online slots to try and, while they all work in the same basic way, there are a few differences that need to be understood.

Video Slots

Video slots are a great way of showing slot games through the screen. Video slots allow for a far greater range of themes, create extra paylines, allow for added bonuses, side games and features that will keep users of all types entertained.

Progressive Jackpot Slots

Progressive jackpot slots are games that are all connected to a wider jackpot which grows every time a relevant game is played, and the jackpot is not won.

Classic Slots

Classic slots are played with three spinning reels, or bars, that contain all of the old original symbols, such as bells and fruit, hence in the UK they can commonly be called fruit machines.


Online Slots Terminology

While it is true that these games are incredibly easy, newcomers to online slots might still be unfamiliar with some of the terminology. What follows should help with this.


Most games will employ 10-12 symbols which have differing paying levels. Generally, there will be low paying symbols plus higher paying ones that relate to the theme of the slot.


The reels run vertically down the grid and include the symbols on them.

Cascading Reels

Every time a win happens in cascading slot games, the symbols that made the win are removed from the game and replaced by new ones that cascade down.


A wild is a symbol with special abilities that allow it to substitute for all other symbols and make winning combinations.


Scatter symbols do not require a payline connection to activate wins and bonus features.


Paylines connect the combinations and can zigzag all over the grid, pay left to right, right to left and even sometimes both ways.


RTP means Return To Player, and refers to the game's payout percentage. The bigger the figure, the better it is for the player.

Progressive jackpots

Progressive jackpots are a shared prize pool that is made up of slices of all of the bets that contributed to it. It will keep swelling until someone scoops the lot.


Often, slots will come with bonus features which can sometimes be a great way to boost winnings.


Jackpots are the maximum amount that can be won playing online slots.

Bet Level

Bet level is the stake that you bet per spin.


RNG stands for Random Number Generator and ensures the randomness of spins to keep payouts fair and regular.

Slot Software

The software behind the game you are playing. Since the explosion in popularity of online casinos, a saturated market of gaming providers has sprung up each looking to out invent the other. Consequently, today we have many format tweaks around slots games.


Best Slots Betting FAQS

🏆 When do Online Slots Pay Out?

Online slots pay out when players achieve and form combinations by lining up winning symbols.

🔢 What Are Paylines Then?

A payline is what connects those same symbols to make the combination.

📍 But, Are Online Slots Fair?

Yes, you don’t have to worry about that – all regulated online slot machines are completely random, thanks to the RNG which keeps things fair.

🎰 How do Online Slot Games Work Exactly Then?

All players need to do is hit the spin button and hope for the best – that’s the basics of how these games work.

💳 No Strategy Needed Then?

No, not at all.


ThePuntersPage Final Say

We hope that this guide has helped you see why slots are the most popular casino game in the world and why so many people love them. They require little-to-no skills with which to get started, provide endless hours of fun and can bring with them great rewards. If players wish they can play high stakes and low stakes, as well as opting for games that are highly volatile, offering greater risk for bigger prizes, or stick to low volatile games and risk very little. The world of online slots truly has something for everybody – take a look at all the slots betting sites we've listed above and take your pick!