Casino Slots Online: Everything You Need to Know

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Casino slots are by far one of the most popular types of games available in any casino, and the more you dig into the library of games found at any casino, the more you start to realize that a huge chunk is just slot titles. Furthermore, slot titles contribute to 100% of the completion rate for most welcome bonuses. So, not only can you get free spins within the games themselves, but you can clear welcome bonuses with ease by playing the most exciting online casino games in any casino – slots games.

Slot titles are constantly being updated with new and unique themes, music, and graphics, keeping players engaged and ensuring they never get stale. The best casinos UK out there will even offer you free spins for specific slots titles on signup, alongside a deposit match bonus to quickly boost your bankroll.

List of The Best UK Casino Sites to Play Slots Online

Claim FREE BONUS:
£88
No Deposit Bonus
*New players only
7 games
4.7 rating
4.7
T&Cs Apply
18+ New UK players only

No Deposit Offer: New Players Only • Claim in 48 hrs • 14 day expiry • FP wins are credited as bonus and capped at £10, exc. JP win • 50x wagering • Deposit Offer: 1st time depositor at 888casino only • £20 min deposit • Claim in 48 hrs • Valid for selected games • Bonus wins capped at £500, excl. JP wins • Pre-1st deposit only: Bonus wins & max redeemable amount capped at £100, excl. JP wins • 30x wagering – req. vary by game • Bonus expires in 90 days • Payment method & country restrictions apply • Withdrawal terms, No Deposit Offer terms & Deposit Bonus Offer terms apply. - www.begambleaware.org
New UK players only • T&Cs apply • BeGambleAware
Welcome Offer:
Up to £25 + 20 Bonus Spins
Bonus for New Players
5 games
4.7 rating
4.7
T&Cs Apply
18+ New UK players only

Full T&Cs Apply.

18+. New UK customers only. Opt-in required. 20 Bonus Spins on "Book of Dead" and 100% Deposit Bonus up to £25 on first deposit. Min deposit £10. 30x wagering requirement for Bonus Spins and 30x wagering requirement for Deposit Bonus (game weighting applies). Max £5/spin or £0.50/line or £50/round (live casino). 30 days expiry. Please play responsible www.begambleaware.org
18+. New UK players only. Full T&Cs applied. Begambleaware.org
Bonus:
100 FREE SPINS
Welcome Offer
* New customers only
4.7 rating
4.7
T&Cs Apply
18+ New UK players only

Full T&Cs Apply.

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New Customers from UK & IRL only. Opt-in required. Full T&Cs apply.
Welcome Offer:
£100
+300 Free Spins

Bonus for New Players
6 games
4.6 rating
4.6
T&Cs Apply
18+ New UK players only

Full T&Cs Apply.

£10 min deposit. £5 max bet using bonus. 40x wagering applies. Bonus valid for 14 days. 30 Spins will be credited instantly upon qualifying deposit + then 30 per day for 9 days on Starburst. Free Spins valid for 72 hours from credit. Max Free Spins winnings £100. Ewallets excluded. - www.begambleaware.org
18+. New UK players only. Full T&Cs apply. Begambleaware.org
Welcome Offer:
£100
+300 Free Spins

Bonus for New Players
6 games
4.6 rating
4.6
T&Cs Apply
18+ New UK players only

Full T&Cs Apply.

£10 min deposit. £5 max bet using bonus. 40x wagering applies. Bonus valid for 14 days. 30 Spins will be credited instantly upon qualifying deposit + then 30 per day for 9 days on Starburst. Free Spins valid for 72 hours from credit. Max Free Spins winnings £100. Ewallets excluded. - www.begambleaware.org
18+. New UK players only. Full T&Cs apply. Begambleaware.org
Bonus:
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Welcome Package
4 games
4.6 rating
4.6
T&Cs Apply
18+ New UK players only

Full T&Cs Apply.

Min. deposit £10. • Maximum amount of Free Spins is 50. • Free Spins valued at £0.10 per spin. • OJO’s Rewards and Game Play policy applies.www.begambleaware.org
First-time depositors only. OJO’s Rewards and Game Play policy applies.
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2 games
4.4 rating
4.4
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New casino players only. Game contributions vary. Terms apply.
Get up to:
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New UK Players
6 games
4.4 rating
4.4
T&Cs Apply
18+ New UK players only

Full T&Cs Apply.

Minimum deposit: £10. • 35x Wagering requirement applies to match up bonus. • Spins credited in specific games. • Spins expire after 24 hours. • Wagering requirement applies to spins. • www.begambleaware.org
Applies only to new depositing players. • 18+ • Wagering requirement applies to spins. Terms and Conditions apply.
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No Deposit Bonus
3 games
4.3 rating
4.3
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18+ New UK players only

New players only • No Deposit Offer: Claim in 48 hrs • 14 day expiry • Free Spins (FS) wins credited as bonus & capped at £10, excl. JP win • Deposit Bonus Offer: FreePlay (FP) wins credited as bonus & capped at amount received, exc. JP win • Valid for selected games • Bonus wins capped at £500, excl. JP wins • Pre-1st deposit only: Bonus wins & max redeemable amount capped at £100, excl. JP wins • 50x wagering - req. vary by game • Bonus expires in 90 days • Payment method & country restrictions apply • Withdrawal restrictions & T&Cs apply: No Deposit Offer & Deposit Offer - www.begambleaware.org
New UK players only • T&Cs apply • BeGambleAware
Bonus up to:
£100
for NEW PLAYERS
Welcome Offer
2 games
4.2 rating
4.2
T&Cs Apply
18+ New UK players only

Full T&Cs Applied.

#AD New customers only, min deposit £20, wagering 35x, max bet £5 with bonus funds. Max bonus is 100% up to £100. No max cash out on deposit offers. Welcome bonus excluded for players depositing with Skrill or Neteller. Cashback is cash with no restriction. • www.begambleaware.org
#AD New customers only • Full T&Cs apply • 18+

How to Start Playing Slot Machines

Time needed: 8 minutes.

Before choosing the right slot machine to play, there are a few things you need to take into consideration. This included the online casino you'll be playing at, the types of games you want, and the RTP percentage they offer. Once all of these things are analyzed, you can start playing immediately.

  1. Choose a Legit Online Casino

    The first step you need to take before you can even begin playing is to simply pick a legitimate casino. This will typically be a site that is fully licensed, has multiple game developers, and offers many payment methods to players.

  2. Register an Account and Collect Your Bonus

    Once you have chosen the casino you want to play at, you need to create an account for it. The account creation process is simple and, most of the time will have the opportunity to accept a welcome bonus during registration. Make sure you do this so you aren’t missing out!.

  3. Choose an Online Slot and Try it For Free

    Next are the online casino slot games themselves. Many casinos will enable you to try out the UK slots online for free in what is known as “demo mode”. So select the games you want to play and test them out for yourself before gambling with real money.

  4. Play and Have Fun

    Remember that you should always play for entertainment and have fun while playing games. Never force yourself to play too much, and always keep track of how much you want to and feel comfortable in betting.

Various Types of Slot Machines

Given that there are thousands of slot games available online at many online casinos, it is no surprise to find out there are several different types to choose from. You have five main types of slots titles available on slot sites in the UK, and here’s a closer look at each of them.

Classic Slots – Old-School Slot Machines with 3 Reels

This is a traditional and simple variation of a slot title that features three reels that are set in motion. Whenever you as a player decide to hit the spin button, the lever is pushed and you have the potential of winning.

Multi-Payline Slots

These are slot titles that have multiple series of winning combinations that can criss-cross the reels themselves. They can feature multiple paylines as well, and offer in-game features and symbols that enhance the experience in some way to bring a heightened level of excitement.

Video Slots – The Most Popular Type of Slots in UK Online Casinos

Video slots are a modern type of online casino slot machine that uses random number generators to work out the combinations you end up getting. This is translated into the symbols you end up seeing on the reels, and many feature multiple paylines, special symbols, and have more winning combinations.

Progressive Slots

Progressive slots are where a portion of the bets placed are set aside and contribute to its maximum jackpot, building progressively over time. When someone wins the maximum jackpot, the progressive slot machine is given an initial jackpot to start with and then keeps getting filled again with each bet until there’s another winner.

Fruit Machines

Fruit slot machines are also popular since you can have low bets on them, and they use classic fruit symbols such as grapes, lemons, cherries, oranges, and watermelons.

You might be overwhelmed when you visit a casino and notice that there are thousands of slots titles. The noteworthy thing here is that multiple game providers work on these games, and each one of them has its stand-out hits. Here’s a look at some of the leading games developers known for their popular and exciting games you’re guaranteed to love.

Microgaming – Provide the most popular slot games for UK players

Microgaming is a private casino software company based on the Isle of Man that was founded in 1994. Since then, it has developed some of the most popular slots games. They are well-known throughout the industry and there are even some casinos that only offer their games. Microgaming slots, as well as all the other games made by this great company, use the RNG system.

The best Microgaming casino, giving an example, can guarantee absolute security and fairness in terms of Return to Player (RTP). Specifically, the payout rate of Microgaming slots is over 90% – at least 20% above the payout rate of classic arcades.

NetEnt – Common slot provider within the casino industry

NetEnt has a reputation of being a premium supplier of digitally distributed gaming systems that are used at many online casinos. They have some of the most popular games out there, and they are a common name within the casino industry. NetEnt slots grow much faster than others: there are many casinos provided by this developer on which users play online in United Kingdom.

Net Ent has invested heavily in its portfolio of smartphone slot games, which are characterized by quality, speed and great gameplay – which is why its smartphone video slots are so popular. UK players who use games branded by this developer are always protected from scams.

Pragmatic Play – New slot provider with amazing titles

Pragmatic Play has created some of the best games in the iGaming industry and offers slots, live casino games, bingo, and much more. The company was only founded in 2015 but has managed to build up quite a solid reputation for itself since then. Pragmatic Play has already collected several very important awards during events dedicated to the iGaming industry.

To play Pragmatic Play slots, you must first open a player account on one of the many casino sites that we have presented to you. Then check for the existence of no deposit bonus for UK players and proceed with the first payment afterwards.

GreenTube

GreenTube is one of the oldest software providers out there, being founded in 1998 by Eberhard Dürrschmid and Harald Reisinger. It now specializes in mobile slot games, offering all of them in an instant-play variation.

Why Play Free Online Slots First

Many casinos out there offer you the option to play and enjoy their online slot titles for free at no cost through a demo mode. When doing so, you will receive virtual funds through which you can play the game. You cannot cash out these winnings, however, it does provide you with an excellent opportunity to experience the various game mechanics of the title of the specific slot in question. You also gain perspective of what kind of gameplay you can expect if you decide to play that slot title with real money.

This is why we recommend playing online slots free first. You can get a look and feel as to how things will end up working for you and to see if you enjoy the game or not before using real money to play with.

Real Money vs Free Slots

Slots game free are slot games where you play with virtual money. As such, you cannot cash them out, but they do allow you to experience all of the various gameplay mechanics of the game for free.

Real money slots are the ones where you have to make a cash deposit and bet real money with each spin of the reels. However, you can cash this money out once you win them, which brings a whole new dimension to the game and a level of excitement that is unparalleled elsewhere.

Great Welcome Bonuses to use on High Payout Slots

Many casinos out there provide you with the opportunity to get a casino welcome bonus when you sign up for an account. This bonus comes in various forms. The greatest welcome bonuses that you can use on high payout slots include a 100% match deposit bonus as well as a free spins bonus.

The 100% match deposit bonus will award you 100% of the value of your deposit back as bonus funds to use on slot games. Free spins bonuses typically come in the form of 20 to 150 free spins that work on specific slots titles or, in some cases, all slot titles. These are the two greatest bonuses you can use on slots and come highly recommended.

Claim €88 Free Bonus by Registering
T&Cs Apply
New customers only • Full T&Cs apply • 18+

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
100% welcome bonus based on first deposit of £10+
T&Cs Apply
18+ New UK players only

Full T&Cs Apply.

ew customer offer. Place 5 x £10 or more bets to receive £20 in free bets. Repeat up to 5 times to receive maximum £100 bonus. Min odds 1/2 (1.5). Exchange bets excluded. Payment restrictions apply.www.begambleaware.org
Get up to £200 + 100 Free Spins Bonus
T&Cs Apply
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What is RTP and Slot Variance? Does RTP Affect Winnings?

RTP stands for Return to Player, which is the reward you can expect to win from online slots. It is expressed as a percentage and is calculated based on the rewards players get when they win the slot game. Typically, you will find that many online slots offer you over 90% RTP, which is why they are so popular.

Slot variance, also known as volatility, is a measure of how often a slot is likely to get a winning combination as well as a form of measuring its average payout size.

While RTP is irrelevant when it comes to playing a single session, a slot that has 96% RTP will pay out better than one that has 86% RTP over a long period. You can win and lose in both of these RTP variations. However, the odds are higher that you will win in a game that has a higher RTP ratio. Slot games with the highest RTP ratio are definitely Age of the Gods RTP of 95.02%, Mega Fortune RTP 96.6%, and Boof Of Ra RTP of 95.50%. Those slots have good RTP and you can try to play it with no deposit bonus for new players from UK.

List of Top 8 Casino Slots to Play Online

£88 NO DEPOSIT BONUS to play Age of The Gods at 888Casino
T&Cs Apply
18+ New UK players only

No Deposit Offer: New Players Only • Claim in 48 hrs • 14 day expiry • FP wins are credited as bonus and capped at £10, exc. JP win • 50x wagering • Deposit Offer: 1st time depositor at 888casino only • £20 min deposit • Claim in 48 hrs • Valid for selected games • Bonus wins capped at £500, excl. JP wins • Pre-1st deposit only: Bonus wins & max redeemable amount capped at £100, excl. JP wins • 30x wagering – req. vary by game • Bonus expires in 90 days • Payment method & country restrictions apply • Withdrawal terms, No Deposit Offer terms & Deposit Bonus Offer terms apply. - www.begambleaware.org
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18+. New UK customers only. Deposit Bonus up to £25 on first deposit. Min deposit £10. 30x wagering requirement for Bonus Spins and 30x wagering requirement for Deposit Bonus (game weighting applies). Max £5/spin or £0.50/line or £50/round (live casino). 30 days expiry. Please play responsible www.begambleaware.org
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Min. deposit £10. • Maximum amount of Free Spins is 50. • Free Spins valued at £0.10 per spin. • OJO’s Rewards and Game Play policy applies.www.begambleaware.org
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Frequently Asked Questions

Which online slots have the best payout?

The slots with the highest RTP percentage have the best payout.

What is the best online slots casino?

Make sure to view our list for the best online casinos that offer the widest range of slots titles available if you want to play online slot games.

Can you play online casino slots for free?

You can experience many casino slots for free through their “demo mode”.