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Best Paying Slots 2021

If you are looking for the best paying slots of 2021, it means you already know how this gambling genre works, and now you are ready to play big. The online casino market is overloaded with free online slots uk titles, each with a unique style and features. The options are never-ending for slot games and why one should choose a single slot to play. It will be pretty boring, don't you agree?

That is the reason Thor Slots feature hundreds of slot titles in its collection that guarantee nonstop entertainment all day. Our game lobby is full of slot games, some high in RTP or volatility and others packed with bonus features. From arcades to Vikings, we cover every theme in the casino market to satisfy every player's gambling palette.

Are you looking for the big winning slots in the gambling world? Look no further as we have compiled a list of slots based on the highest RTP, jackpots and volatility for you. So read along, and you will be intrigued to try some of the high paying online slots with real money.

High Return Slots

What Factors Affect the Online Slots Payouts?

When you are in the online casino market looking for high-paying online slots, it's best to familiarise yourself with some technicalities.

All uk slot games online are built to stand out, and the payout system is also designed in unique ways. Many factors affect the payout of a slot game, including RTP, volatility, and hit frequency. Each factor plays its role in affecting the payout unless you find two identical games from the same software provider. Read below to find out how different factors affect the slot's payout.

Role of Return To Player (RTP) in Slot Payouts

RTP or Return To Players is a common term all slots players are familiar with, but what does it mean, and why is it mentioned in every slot game?

The RTP is the percentage of sum wagered against the money amount paid back to a player over time. Most online slots feature 94%, and we don't suggest that players take a chance on slots below 94% RTP. The chances are high that you have been playing slots with more than 96% RTP.

Let's explain it in simple terms: if you wager £100 on a slot game with 96% RTP, you will get £96 in return. Let's be clear that it's not the case every time some players win more than anticipated, and other times they lose more.

Slots are a game of chance; you may hit a six-figure jackpot with a £10 bet, or you lose spin after spin on the same slot game. The RNG technology that operates these slots makes sure that every spin is random. Keep reading, and you will know which slot games have the highest RTP in the market.

Best Slots RTP

Role of Volatility/Variance in Gameplay

Volatility, or sometimes referred to as variance, is the frequency of a slot payout throughout the game. It is subdivided into three categories, namely:

  • Low Volatility: Wins are frequent in low volatility slot games, but stakes sizes are small.
  • Medium Volatility: A popular subcategory that offers ample value, win and winning frequency is relatively higher than low volatility. Medium volatility slots are more inclined towards high volatility than low.
  • High Volatility: Slot with high frequency offers high-value wins but less frequently. It's hard to land bonus rounds and score winning combos, but the results are super sweet.

Hit Rate Relation to Slots Volatility

Hit rate or hit frequency is a term we use when explaining the frequency of landing winning combinations on the reels on every spin.

  • Low Hit Rate/Frequency: Win are fewer in number, but prizes are bigger.
  • High Hit Rate/Frequency: Frequent wins but lower in amount, sometimes smaller than your total wager.

Where wins are concerned, volatility and hit frequency are interlinked, and it is important to consider these factors when looking for high paying slots online.

6 Features to Consider when Choosing a High Paying Online Slot 2021

Online slots are chance games, but there are certain factors that players should consider to increase their winning chances. Look out for these slot features when you are planning to win big:

  1. RTP: The RTP is an important factor that gives players an average of how much payout they should expect from a slot. Every slot game has an RTP; the higher the RTP, the more money you will get and vice versa.
  2. Bonus Games: You can boost your winning chance on a slot game with bonus games that primarily include free spins. These bonus rounds offer an opportunity for substantial winnings, and such slots are referred to as Loose slot games.
  3. Volatility: RTP and volatility are often mention side by side, and the latter explains the frequency of the wins on the slot games. The higher the volatility, the lower the winning frequency and the lower the volatility, the higher the winning frequency but with small wins.
  4. Bonuses: Don't miss out on bonus offers we offer at Thor Slots, as you can win cash rewards without spending any dime on wagers. Free spins are a regular occurrence on Thor Slots; you can enjoy tons of slot games and get a chance to win a substantial winning amount. These bonuses are your best chance to get the load off your pocket.
  5. Progressive Jackpots: If you want to win big, your best chance is Progressive Jackpot slots as they can win players six or plus figure winning amount depending on the pot. The jackpot on these slots increases with every wager.
  6. Managing Bankroll: It's important to consider your bankroll when paying for slot games and planning to win big. You cannot increase your winning chances on a minimum £5 bet slot game with £10 in your pocket or account. You may or may not hit the jackpot with just two attempts.

Best Slots RTP

Highest RTP Slot Games

To save you valuable time, we have made an effort to handpick the best payout online slots for 2021. So you can pick one and start playing with real money on any online slot site.

Ocean Princess

  • Developer: Playtech
  • Paylines: 20
  • Reels: 5
  • RTP: 99.10%

Ocean Princess is a classic slot game that will take you deep into the seas where sea creatures decorate the reels. The slot includes some impressive features like Hold, wilds and scatters that may win you the ultimate prize in the game.

Jackpot Jester 50,000

  • Developer: NextGen
  • Paylines: 5
  • Reels: 3
  • RTP: Base Games - 95.08% and Super Game Mode - 99.90%

Jackpot Jester 50,000 is a simple gameplay slot with low volatility and high RTP that increases players' winning chances. The slot games are your ticket to reliving the old days when players only played slots in Las Vegas casinos. The highest winning potential of the slots is 50,000x your original wager.

Ugga Bugga

  • Developer: Playtech
  • Paylines: 20
  • Reels: 3
  • RTP: 99.10%

Ugga Bugga is a famous slot game in the list of high-paying slots of 2021. The slot earns its reputation for high-quality graphics, superb sound effects, and creative titles.

The slot game is a fantastic blend of classic 3 reels with modern bonus features. It takes some time to understand the gameplay of the skit hit; once you get a grip, it's a straight walk ahead.

Triple Bar

  • Developer: 1x2 Gaming
  • Paylines: 1
  • Reels: 3
  • RTP: 98.15%

It's the latest addition in the classic category of 1x2 Gaming, released in 2021. These slots will make you feel nostalgic by taking you back when brick and mortar casinos were the only gambling hub. The game is a classic by mechanics, but its graphics are super modern and classy with a gold and black theme. It is a single slot with standard symbols like Double bar, bar and triple bar.

Blood Suckers

  • Developer: NetEnt
  • Paylines: 25
  • Reels: 5
  • RTP: 98.00%

NetEnt never ceases to impress its players with high-quality slot titles; this time, the theme is paranormal inspired by the block sucking vampire. It's a dark theme slot game with gory images that make you cringe. The most rewarding bonus of the slot games is its free spin features that may win players a maximum prize of £50,730 during the bonus spin round.

Gipsy Rose

  • Developer: Betsoft
  • Paylines: 30
  • Reels: 5
  • RTP: 97.63%

Betsoft has created remarkable animated slot titles with 3D effects that enhance the gaming experience for players. Players will be on the edge if they sit the whole time as the slot features many exciting bonus rounds. The fortune-teller is an amusing character that keeps players entertained with different sound effects throughout the game. You will see the basic fortune teller symbols in the reels, including carrot cards, crystal balls, magic books, and even love potions.

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Best Slots in Terms of Max Win/Payouts

  Title Developer RTP Paylines Max Win
1 Mega Joker NetEnt 99.0% 5 2000x
2 1429 Uncharted Seas Thunderkick 98.63% 25 670x
3 Joker Strike Quickspin 98.11% 10 1000x
4 Kings of Chicago NetEnt 97.80% 5 13000x
5 Blood Suckers NetEnt 98.00% 25 900x
6 Esqueleto Explosivo Thunderkick 97.60% 17 700x
7 Rock On Rival Gaming 97.00% 20 10000x
8 Hot Ink Microgaming 97.50% 243 ways 125000x
9 Steam Tower NetEnt 97.00% 15 2000x
10 Break Away Microgaming 97.00% 243 ways 125000x

All values are subject to change at anytime.

Best Slots RTP

Best Online Slots in Terms of Bonuses/RTP

  Game Title Payout Percentage Details
1 Jackpot 6000 98.9% An amazing slot with a classic theme and a jackpot meter that has the potential to win players 6000 coins.
2 Good Girl Bad Girl 97.8% An exciting slot game that gives players a choice to play on the good side or bad.
3 Wolfpack Pays 97.75% High-quality graphics that display mesmerising drops with natural scenery and give players 243 ways to win.
4 Doo-Wop Daddy-O 97.8% An outstanding slot game that features three progressive jackpots and 2 bonus games.
5 Big Bad Wolf 97.35% A popular title voted as best slot game where players collect moons n free spin round.
6 Super Pop 97.5% Perfect slot for Candy Crush fans that increase player's payout with every level.
7 Avalon 96.01% The slot game feature an exclusive bonus card round that increases players winning 2 to 4 folds.

All values are subject to change at anytime.

Best Slots RTP

6 Biggest Jackpot Winnings of All Time

Do you know players have won millions with slot games? If you don't believe us, take a look at the biggest jackpot winning of the online casino world.

  Payout Slot Game Date Casino
1 £23.6 million Absolutely Mad Mega Moolah 27th April 2021 Napoleon Sports and Casino
2 £21 million Mega Fortune 20th January 2013 PAF
3 £17.2 million Mega Moolah 6th October 2015 Betway
4 £23.5 million Mega Moolah 28th September 2018 Grand Mondial
5 £12 million Mega moolah April 2020 Jackpot City
6 £9.5 million Mega Fortune 28th November 2015 Folkeautomaten

All values are subject to change at anytime.

Best Slots RTP


The online casino world is famous for its wide range of slots, and some of these slot machines have an impressive payout. We have compiled a few questions and answers that players frequently ask regarding online slots payout.

Which online slot game has the highest payout in 2021?

Gaming developers are in a race of developing new and improved slot machines that payout more with their exclusive bonus rounds. The names in the list include Mega Joker, Ugga Bugga and many more.

Is it easy to play online slots?

Online slots are the easiest to play casino games that do not require any special skills or strategies. However, to increase your winning chances, you must get familiar with basic features like RTP, volatility, hit frequency, bet amount, reels, and paylines.

Can I play high-paying slots for free?

Online casinos offer numerous bonus offers that give payers a chance to play high-paying slots for free. Search the internet for such casinos and register to claim the free spin offers on various slot games. For example, you can join Thor Slots for free and visit the promotion page to claim various free spin offers on multiple slot games.

*Any Free Spins/Welcome Bonuses References are subject to the following: NEW PLAYERS ONLY, MIN DEPOSIT £10, £8 MAX WIN PER 10 SPINS, MAX BONUS EQUAL TO LIFETIME DEPOSITS (UP TO £250), 65X WAGERING REQUIREMENTS AND FULL T&CS APPLY.

*All values (Bet Levels, Maximum Wins etc.) mentioned in relation to this slot game are subject to change at any time.

Best Slots RTP