Best Online Slot Sites 2021

Compare offers & read top slot brand reviews

Casimba

200% Welcome Bonus up to £500 + 50 Bonus Spins

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18+. New players only. 1 bonus offer per player. Min. deposit £20. Max. bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Winnings from Bonus spins credited as bonus funds and capped at £100. Bonus funds expire in 30 days, unused bonus funds will be removed. Welcome Offer is 200% match up to £500 + 50 bonus spins on your 1st deposit, 25% match up to £1000 + 50 bonus spins on your 2nd deposit, and 50% match up to £500 + 25 bonus spins on your 3rd deposit. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds count towards wagering contribution. Terms apply. BeGambleAware.org

Dream Vegas

100% Welcome Bonus up to £400 + 50 Bonus Spins

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18+. New players only. One bonus offer per player. Minimum deposit £20. Max bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Winnings from Bonus spins credited as bonus funds and capped at £100. Bonus funds must be used within 30 days otherwise any unused bonus shall be removed. Bonus funds are 100% match up to £400 on your 1st deposit, 40% match up to £3000 on your 2nd deposit, and 60% match up to £1500 on your 3rd deposit. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds contribute towards any wagering requirements. Terms apply. BeGambleAware.org

21 Casino

121% Welcome Bonus up to £300

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18+. New players only. Min deposit £10. Bonus funds are 121% up to £300. Bonus funds + spin winnings are separate to cash funds and subject to 35x wagering requirement. Only bonus funds count towards wagering contribution. £5 bonus max bet. Bonus funds must be used within 30 days, spins within 10 days. Terms Apply. BeGambleAware.org

Leo Vegas

Unlock up to £100 Cash & 20 Wager-Extra Spins

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Full T&Cs apply. Extra spins - no deposit required & new players only. Claim within 3 days of registration & 3 day expiry. Extra spins worth £0.10 each on Book of Dead, winnings paid as cash. Deposit offers available across any two deposits. Both expire 7 days after registration & have 7 days to wager once claimed. Deposit £10, £25 or £50+ & wager 35x for a cash reward. Only cash stakes qualify & wagering contributions vary. 5 extra spins on Book of Dead with each qualifying deposit, 3 day expiry. 18+ BeGambleAware.org.

888

Play with £88 FREE No Deposit Needed + 100% up to £100 BONUS with your 1st Deposit

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New players only • No Deposit Offer: Claim in 48 hrs • 14 day expiry • FP wins are credited as bonus and capped at £10, exc. JP win • 50x wagering • Deposit Bonus Offer: £20 min deposit • Valid for selected games • Bonus wins capped at £500 • 30x wagering – req. vary by game • Bonus expires within 90 days • Withdrawal terms, No Deposit Offer terms & Deposit Bonus Offer terms apply.

BetVictor

Wager £10, Get £70 in Bonuses + 50 Extra Spins

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New customers only. Opt in, deposit and wager £10 on selected games within 7 days of opening new account. Get 2 x £20, 3 x £10 bonuses for selected games with up to 40x wagering & 7 days expiry. Max redeemable from bonuses £1,750. 50 Extra Spins are on selected games, have no wagering and expire in 7 days. T&Cs Apply, see below. 18+| Begambleaware.org Please Gamble Responsibly.

Videoslots

100% Welcome Bonus up to £200

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New players only. Min deposit £/$/€ 10. Account balance is withdrawable at any time, upon withdrawal, any remaining bonus spins are forfeited. 7 days to activate the spins: Bonus spins expire24 hours after activation. Full T&C apply.+18 Play responsibly.

MansionBet

100+ Casino Games available now

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T&C's Apply, 18+, Please Gamble Responsibly.

Karamba

100% Welcome Bonus up to £50 + 100 Extra Spins

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18+. New UK depositing players only. Min. deposit: £10. Max. bonus: £50. Offer valid on first deposit. Games are given as follows: 20 games and 100% bonus upon first deposit. Another 40 games are given upon deposit on the second day after the first deposit (min £20), and an additional 40 games are given upon deposit on the third day (min £20). Winnings won with games that require deposit, have to be wagered 35x. Bonuses that require deposit, have to be wagered 35x. Gamble responsibly. www.begambleaware.org

Betfair

100% Match Bonus up to £100

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Bonus awarded requires 50x wagering and must be completed within 7 days of issue. By taking part in this promotion, you agree with our Terms & Conditions.

William Hill

100% Buy in Bonus + 50 Extra Spins

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18+ Opt in required. New customers to Casino page only. 1x per customer. Min. Buy in £10. Bonus value 100% of Buy in. Max. Bonus £300. 40x Wagering, Max Redeemable £4,000. 50 Extra Spins with x35 wagering will be awarded after the Buy in Bonus is completed, Max Redeemable £1,000. Bonus expires after 7 days. Stake contributions, player, country, currency, payment method, game restrictions and terms apply.18+

Paddy Power

Deposit £10, Get £50 + 100 Extra Spins

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New Customers from UK & IRL only. Deposits made with e-wallets are not valid for this promo. Bonus wagering x35 on eligible games. Winnings from bonus capped at £/€500. Spins available after bonus is redeemed/lost. Opt in required. Full T&Cs apply.

Bet365

Casino at bet365 - Up to £100 New Player Bonus!

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New Casino customers only. Deposit min. £10. Applies to first deposit to Casino only. Max. bonus £100. 20x wagering (game weighting, table coverage and max. bet rules apply) on deposit and bonus to make the bonus balance withdraw-able. Time limits and T&Cs apply. 18+. Gamble responsibly. www.begambleaware.org

Ladbrokes

£50 Welcome Bonus

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18+. New players only. Min bet £10 on qualifying games. 40x wagering reqs (bonus only) on selected games. Bonus valid for 30 days. Certain deposit types excluded. Bets covering > 70% of Roulette table excluded. T&Cs apply

Guide to Online Slots UK

You place your bets, spin the reels... sometimes you win, sometimes you lose. That’s online slots in a nutshell, isn’t it?

Not anymore, with new bonus features, side rounds and enhanced gameplay all taking the genre in innovative and exciting directions. Here we look at how to find the very best slot games online and how your choice of online slot sites will go a long way to determining your enjoyment of the games on offer.

What’s Offered at Online Slot Sites?

  • Slot Variety: The best online slots sites will offer an extensive collection of games of differing type, from standard and progressive jackpot slots to 3D and video-based titles.
  • Casino Games: It’s always nice to have a change of scene once in a while, so slots sites that also have a casino section, stacked with games like blackjack, roulette and baccarat, are also welcome.
  • Welcome/Ongoing Bonuses: We all love a good bonus and any online slot site worth its salt should offer a welcome package to new players. But just as important are the promos that keep players coming back for more time after time; these really can make a difference to your bankroll.
  • Loyalty Programmes: Linked to the above, loyalty programmes offer players ‘replay value’ because they reward you for playing your favourite games. Loyalty points are gained and can be redeemed on free spins, reload bonuses and more.
  • Free Play Mode: It is well worth trying out a number of slot games before deciding which you want to wager real money on. And that’s why free play mode is so important; you can ‘try before you buy’!

What Makes the Best Online Casino Slot Sites?

You may want to play the very best online casino slots, but the games are only part of the equation. Consider your user experience: if the site takes an eternity to load, or is a nightmare to navigate, then your enjoyment is going to diminish exponentially.

Also, be sure to ponder whether this is a trusted site or not. Make sure it has security provisions in place to protect your personal data and read impartial reviews about the site before making a deposit.

The best online slots UK platforms will hand out handsome bonuses to new and existing players, but a word of caution: all that glitters isn’t always gold. Think about the wagering requirements attached to any offer and how realistic they are to ‘play through’.

And once you have used that welcome bonus, what else does the slot site offer? Are there ongoing promotions that tickle your fancy? Some sites use welcome bonuses to hook new players, but then offer very little from that point on.

Finding the Best Online Slots

Here's what you should factor in when drawing up a checklist that identifies the best UK online slots.

We’ve mentioned bonuses and promotions already, and while it is tempting to focus on the ‘free stuff’ there are plenty of other items for consideration. Think about payout percentages. These Return to Player (RTP) rates determine how often you can expect to win when playing a particular slot. It’s not a perfect science, but the percentage outlines your win ratio if playing an infinite number of times. Some slots are slow and steady earners, while others offer high variance where wins come rarely but at a higher rate of return.

There are some names in slot game production that are almost a guarantee of quality. Software developers such as NetEnt, Microgaming and Playtech continue to produce the most playable and innovative games around. If a slot site carries an extensive collection of their releases then you won’t go far wrong.

Another thing to think about when considering the best of online slots is how the game(s) look on your preferred device. For instance, some older sites haven’t really been designed to be compatible with newer smartphones and tablets, whereas others have mobile playability in mind. If you plan on playing slots on your phone, make sure the site has been built to make the most of the technology.

Guide to Online Slots UK

You place your bets, spin the reels... sometimes you win, sometimes you lose. That’s online slots in a nutshell, isn’t it?

Not anymore, with new bonus features, side rounds and enhanced gameplay all taking the genre in innovative and exciting directions. Here we look at how to find the very best slot games online and how your choice of online slot sites will go a long way to determining your enjoyment of the games on offer.

What’s Offered at Online Slot Sites?

  • Slot Variety: The best online slots sites will offer an extensive collection of games of differing type, from standard and progressive jackpot slots to 3D and video-based titles.
  • Casino Games: It’s always nice to have a change of scene once in a while, so slots sites that also have a casino section, stacked with games like blackjack, roulette and baccarat, are also welcome.
  • Welcome/Ongoing Bonuses: We all love a good bonus and any online slot site worth its salt should offer a welcome package to new players. But just as important are the promos that keep players coming back for more time after time; these really can make a difference to your bankroll.
  • Loyalty Programmes: Linked to the above, loyalty programmes offer players ‘replay value’ because they reward you for playing your favourite games. Loyalty points are gained and can be redeemed on free spins, reload bonuses and more.
  • Free Play Mode: It is well worth trying out a number of slot games before deciding which you want to wager real money on. And that’s why free play mode is so important; you can ‘try before you buy’!

What Makes the Best Online Casino Slot Sites?

You may want to play the very best online casino slots, but the games are only part of the equation. Consider your user experience: if the site takes an eternity to load, or is a nightmare to navigate, then your enjoyment is going to diminish exponentially.

Also, be sure to ponder whether this is a trusted site or not. Make sure it has security provisions in place to protect your personal data and read impartial reviews about the site before making a deposit.

The best online slots UK platforms will hand out handsome bonuses to new and existing players, but a word of caution: all that glitters isn’t always gold. Think about the wagering requirements attached to any offer and how realistic they are to ‘play through’.

And once you have used that welcome bonus, what else does the slot site offer? Are there ongoing promotions that tickle your fancy? Some sites use welcome bonuses to hook new players, but then offer very little from that point on.

Finding the Best Online Slots

Here's what you should factor in when drawing up a checklist that identifies the best UK online slots.

We’ve mentioned bonuses and promotions already, and while it is tempting to focus on the ‘free stuff’ there are plenty of other items for consideration. Think about payout percentages. These Return to Player (RTP) rates determine how often you can expect to win when playing a particular slot. It’s not a perfect science, but the percentage outlines your win ratio if playing an infinite number of times. Some slots are slow and steady earners, while others offer high variance where wins come rarely but at a higher rate of return.

There are some names in slot game production that are almost a guarantee of quality. Software developers such as NetEnt, Microgaming and Playtech continue to produce the most playable and innovative games around. If a slot site carries an extensive collection of their releases then you won’t go far wrong.

Another thing to think about when considering the best of online slots is how the game(s) look on your preferred device. For instance, some older sites haven’t really been designed to be compatible with newer smartphones and tablets, whereas others have mobile playability in mind. If you plan on playing slots on your phone, make sure the site has been built to make the most of the technology.