Best Online Slots: The UK’s Best Bonuses, Sign-Up & Welcome Offers

It’s a subjective task to name the best online slots sign-up and welcome offers. Every site is different and so is each individual bettor.

Some punters will want a high matched deposit bonus while others want low wagering requirements. Many other players are only looking out for free spins or the best online slots bonuses.

Everyone has different needs so this guide aims to meet them all. This betting guide will showcase the best online slots offers across a range of different categories.  Use the table of contents to jump straight to whatever you’re looking for.

Commercial Content 18+ T&Cs apply For New Customers Only

  1. Casino at bet365 – Up to £100 New Player Bonus

    Casino at bet365 – Up to £100 New Player Bonus

    New Casino customers only. Deposit min. £10. Max. bonus £100. 20x wagering (game weighting, table coverage and max. bet rules apply) on deposit and bonus to make the bonus balance withdrawable. Time limits and T&Cs apply. The bonus code can be used during registration, but does not change the offer amount in any way. Full T&Cs


  3. 100% Buy in Bonus + 50 Free Spins

    100% Buy in Bonus + 50 Free Spins

    18+. Play Safe. 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 Free Spins with x35 wagering will be awarded after the Buy in Bonus is completed, Max Redeemable £1000. Bonus expires after 7 days. Stake contributions, player, country, payment method, currency, game restrictions and terms apply. Full T&Cs
  4. £50 Welcome Bonus

    • Plethora of games

    £50 Welcome Bonus

    18+. New players only. Min bet £10 on qualifying games. 40x wager 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. Full T&Cs
    • Plethora of games
    Review Claim Offer


    New UK&IRL Customers Only. Min Deposit £10 . Deposits made by e-wallets are not valid. Bonus wagering x35 on eligible games. Winnings from bonus capped at £500 . £5 Max Stake On Bonus. Spins available after bonus redeemed/lost. Spins value 0.10p. Opt In required. Full T&C's apply. Full T&Cs
  6. Wager £10 Get £30 + 100 Free Spins

    • Casino Offer for New Customers

    Wager £10 Get £30 + 100 Free Spins

    18+ new customers only. Deposit, opt in and wager £10 on selected games within 7 days of opening new account. Get 3 x £10 bonuses for selected games with up to 40x wagering plus 100 Free Spins. Bonuses expire in 7 days. Max redeemable from bonuses £750. 100 Free Spins have no wagering and expire in 7 days. T&C's Apply. Please Gamble Responsibly. Full T&Cs
    • Casino Offer for New Customers
    Review Claim Offer
  7. Deposit £10 Get £40

    Deposit £10 Get £40

    18+. New Customers Only. Minimum deposit £10. 50x wagering requirement apply. Bonus will expire 30 days after opt-in. Further T&Cs apply. #AD Full T&Cs


    18+. Open to UK residents who have registered through the relevant affiliate link after 04.01.2020. T&Cs apply. Get 50 EnergySpins (ES) on Book of Dead™️ (£0.10, valid 7 days) with your first deposit. Offer not available for any deposits thereafter. Available once per customer. Opt-in by choosing the Welcome Offer tab before making your deposit, otherwise select "NO BONUS". Winnings from ES carry no wagering requirement. Max winnings are capped at: £100. Irregular gameplay may affect eligibility. Play responsibly. Full T&Cs
  9. First Deposit Bonus 100% up to £100 & 300 Free Spins

    First Deposit Bonus 100% up to £100 & 300 Free Spins

    18+ Full T&C's Apply New players only. £10 min deposit. £5 max bet using bonus. 60x (40x referred player) wagering applies. Bonus valid for 14 days. 30 Spins on preselected games will be credited instantly + then 30 per day for 9 days. Free Spins valid for 72 hours from credit. Max Free Spins winnings £100. Ewallets excluded. - Full T&Cs

Best Online Slots  Sign-Up Bonus for Matched Deposit: bet365 Slots

The most common online slots sign up bonus is the matched deposit bonus. Readers can be assured that bet365 beat some intense competition in this category.

The concept is simple. Players deposit however much they want and bookmakers will match said deposit up to a certain amount in bonus funds. This gives the user more flexibility over how much or little they want from their welcome bonus.

New players can take advantage of similar offers at 32Red, Betfair and William Hill. But the bet365 slots bonus for new players stands out due to its low wagering requirements. It’s up to three times in most cases.

Other UK online slots providers may match your deposit up to a higher amount. Some even offer players a bonus of more than 100% of their first deposit but we think that bet365’s offer is the best. The lower wager requirements make it easier to see the benefit from the matched deposit bonus funds.

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 withdrawable. Time limits and T&Cs apply.

Best Online Slots No Deposit Sign-Up Bonus: 888casino Slots

This is still sought-after but far less common than was once the case. Many online slots will offer a no-deposit sign-up bonus to new players and we think the best of all comes from 888casino.

Pieces of eight have long been associated with treasure.  888casino give that a modern twist by offering a bonus of £88 to play with and no deposit required.

There is another upside here. Where most online slots UK operators’ bonuses expire after seven days, 888casino doubles your timeframe. New players have 14 days to play through their bonus before it expires.

New players only • Claim within 48 hrs • 14 day expiry • FreePlay (FP) wins credited as bonus & capped at £10, excl. JP wins • Valid for selected games • Bonus wins capped at £500, excl. JP wins • 50x wagering – req. vary by game • Bonus expires in 90 days • Withdrawal restrictions, T&Cs apply.

Best Online Slots Sign-Up Bonus for Free Spins: William Hill Slots

What could be better than a welcome offer featuring a generous helping of free spins to help you try out the games on offer at an online slots site?

50 Free Spins with no wagering and no deposit required
New customers only. Max free spins at 10p/spin. Available on selected Megaways™ slots Terms and conditions apply. Full T&Cs

Best Online Slots Sign-Up Bonus for Low Wagering Requirements: Grosvenor Slots

Experienced online slots players will know a sign-up offer is only as good as its wagering requirements. Grosvenor’s online casino has the lowest around.

New players can receive an online slots bonus of up to £50. The wagering requirements for these bonus funds start at just 5x depending on the games being played.

New players must deposit £20 to receive this offer. Just 5x wagering requirements is incredibly low. Many sites can require ten times that amount.

Offers available on 1st deposit only. (Max reward £50 bonus, 5x wagering). Some games have different wagering contributions. Some games exclude bonus play. T&Cs apply.

Best Online Slots Sign-Up Bonus for First Deposit to Bonus Ratio: Paddy Power Slots

Matched deposit bonuses are brilliant if you want to deposit a large amount into your new account. However, if you want to land a healthy sign-up bonus in return for only a small outlay then the Paddy Power slots bonus could be perfect.

This type of bonus is better for less experienced players. The higher bonus allows new players to try out multiple new games for less. New players can deposit £10 and get 100 free spins with the Daily Jackpots Slots Collection.

The free spins expire in 7 days and the best part is that there are no requirements on them. Whatever you win, you keep.

Register via the promo code PGCTV1, age verification and SMS verification required. Free Spins will be credited instantly, are valued at £0.10 each and expire after 7 days. T&Cs Apply

Best Online Slots Sign-Up Bonus Honourable Mentions

The online slot offers in this section were not selected for one the awards above but still deserve a mention. These all came close in at least one of the categories.

32Red Slots

32Red Slots were unlucky not to claim outright victory in the ‘best online slots sign up bonus for matched deposit’. They provide new customers with a massive 150% matched deposit bonus up to a maximum of £150.

It’s fair to say that 150% is one of the biggest slots deposit bonuses around. This is a popular offer for slots players who want to be rewarded for making a substantial first deposit.

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

BGO Slots

BGO Slots offers new players an enormous number of free spins for a £10 initial deposit. New players can get up to 500 free spins on their Mega Wheel game.

UK only. Win up to 500 Free Spins from Mega Wheel on 1st deposit. 24-hour expiry. Max bet £2.50, max spins win £8 per 10 spins, max Bonus win £150, selected games & 65x wagering on winnings. No Neteller/Skrill. Full T&Cs apply

Betfred Slots

Betfred Slots has a competitive welcome offer with low wagering requirements. New players can deposit £10 to get 50 free spins to use on a selection of popular games. The thing that makes this one of the best online slots offers around is that there are no wagering requirements for the winnings from the 50 free spins.

New Casino customers only. £10 min transfer & stake on slots within 7 days. Min 5 game rounds. Max 50 Free Spins on selected games, credited within 48 hours of qualifying. Free Spins expire after 7 days. E-Wallet & Pre-Paid card restrictions apply. SMS validation may apply. Full T&Cs apply.

BetVictor Slots

This is a good welcome bonus for players who don’t want to deposit too much to start off.

New players can deposit and wager £10 to get a bonus worth up to £70. This bonus takes the form of multiple smaller bonuses that are valid on different games or markets.

18+ new customers. Opt in. Wager £10 on selected games within 7 days of registering. Get 2x £20, 3x £10 bonuses, selected games, up to 40x wagering to withdraw max £1,750, 7 days expiry. T&C’s Apply.

Unibet Slots

The Unibet Slots sign-up offer is good for players who want to take their time. New players can deposit £10 to get up to £40 in bonus funds. These funds will last a lot longer than many other sites and will expire after 30 days.

New customers only, min deposit £10, bonus money must be wagered 35x on casino (excluding selected games) before any bonus funds are withdrawable, wagering on table games contributes 10% to wagering requirements, bonus funds expire 30 days after opt-in

Want all the best online slots bonuses and sign up offers in one place?

Our Slots Offers page is always updated with the latest new customer welcome bonuses.