Best Online Slots Guide - Casino Sites to Play for Free or Real Money

If you're looking to play the best online slots for real money, you've come to the right place. All the featured casinos on this page offer hundreds of top online slot machines and progressive jackpots from the world's leading software providers. Not only that, these sites have lucrative free spins and no deposit bonuses to get you started for free. Read on to discover the highest-ranked slots online casinos and all the information you need to play and win real money in 2024.

Written by Bonnie Gjurovska 22 minute read

Best Online Slots Games to Test for Free

Recommended Casino Sites to Play Top 10 Slots for Real Money

When it comes to online games for real money, slots are the most popular choice for entertainment, exciting gameplay, and huge jackpot wins. Players can choose from a huge array of top titles which range from classic 3-reel, 5-reel video slots, progressive jackpots, and more. There are hundreds of online casinos hoping to attract new players with attractive bonuses and free spins on new real money games. We only list the greatest casino slots sites that are fully regulated and legal and below is our list of top 10 slots in 2024.

Game Name Software Type Best Feature Recommended Casino Quick Hit Bally 5 Reel Classic Free Spins Mega Moolah Microgaming 5 Reel Video Progressive Jackpot Heidi's Bier Haus WMS 6 Reel Video Free Spins Da Vinci Diamonds IGT 5 Reel Video Tumbling Reels Kitty Glitter IGT 5 Reel Video Free Spins Siberian Storm IGT 5 Reel Video Free Spins Book of Ra Novomatic 5 Reel Video Expanding Symbols Texas Tea IGT 5 Reel Video 100x Multipliers Starburst NetEnt 5 Reel Video Starburst Wilds Zeus 3 WMS 6 Reel Video Nudging Wilds

Comparing the Best Slots Online in 2024

If you're not sure which of the online slots to play for real money, our comparisons below should help. We've compared the best casino slots online from the leading software providers based on theme. This should help you to identify, which of these games will suit you better and remember, you can try most of them for free.

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Interesting Facts About Online Casino Slots Versus Land Casinos

Slot machines have been around for many decades now and although they began life in land-based gambling halls and casinos, they are now available around the world for online casino players. Below are some interesting facts that you may not be aware of.

The Best Online Slot Games Pay Better than at Local Casinos

The best real money online slots will often pay out more than the same game at a land-based casino. This is because of RTP percentages and the requirements for land-based establishments and online gambling sites. Land-based machines can have a return to player percentage that ranges from 70% to 90%. The recommended online slots will have a much higher RTP and games that are less than 95% are often considered bad. Most of the top online slots games have RTPs that are higher than 96%. This means when you play for real money online, you are guaranteed a much higher payout over a period of time.

Real Money Slots Make Up 85% of a Casino's Revenue

Casinos make most of their revenue from online slots and this is the reason why you will find a lot of great bonuses and promotions being offered. Casinos know that players enjoy these games and in order to encourage more bets and more revenue, they provide players with lucrative incentives. This can often include no deposit spins on new release titles and the most popular games on their sites.

Slot Machines are More than 130 Years Old

Slot machines were invented more than 130 years ago and have come a long way since then. Charles Fey invented the first slot, The Liberty Bell, back in 1887. This game simulated a game of poker and had 3 reels each with 5 symbols. Players put in a coin and spun the reels in hopes of landing the symbols in a particular pattern to get a payout. Fey rented his games for a 50% commission and many of his innovations are still common in the games we find at online casinos today.

"Hot" and "Cold" Slots Don't Exist

It is a common misconception that real money slot machines are either hot or cold and that players can gauge whether they will win or lose based on recent payouts. They think the those that have paid out recently are hot and those that have paid out very little are cold. This perception raises the excitement for players and has them looking for the right titles. In today's modern online gambling, there is absolutely no logic to this. Random number generators are used in all slot machines, and they ensure that all spins are completely random. One way to determine whether a title is good to play or not is by looking at the RTP and volatility (explained further down the page) as this will help you see how frequent payouts will be.

Slots are the Only Casino Games with Opaque Odds

Every casino game has a house edge that you can calculate based on the odds of winning each bet and the payoffs for each bet. With table and card games, there are a finite number of winning combinations and calculating the odds is relatively easy. Slots are different. There is no way to determine the odds of getting a particular symbol and without this information you can't find out what the house edge is. The house edge for slots is 5% or more and you can't narrow this down because of the random number generator.

In Japan, Real Money Slots (Pachinko) are Most Popular

The number one country in the world for slot machines is Japan. Believe it or not, they have 5 million machines throughout the country with Pachinko being one of their most popular games.

There are no Strategies When Playing the Best Real Money Slots Online

Slots are essentially a game of chance and there aren't really any strategies you can use to increase your winning odds. There are some tips and techniques you can apply to increase your chances of winning, but in terms of guaranteeing a win, there is nothing you can do. We do recommend you choose the best online casino slots to play and look at RTP percentages and volatility. You can also try them free with no risk first.

Professional Real Money Players Exist

There are locals living in Las Vegas that are considered professional slots players and there are neighborhood casinos that cater to these players. There are people who earn their living this way.

Real Money Slots are the Most Profitable for Online Casinos

Real money slots bring in the most revenues for online operators. This is because there are always new titles being released and new innovative features being designed. Slots have changed over the years with new bonus features such as free spins, storytelling, and even gamification being added to entertain players, which in turns keeps them playing for longer and upping the earnings.

Linked Progressive Jackpot Online Slots Best for Big Money Wins

If you're looking to play for the chance of hitting a life changing jackpot, linked progressive jackpot slots should be your preference. These are games that are linked across a number of online casinos, and they offer the biggest jackpot prizes. When you play on any of the linked games, the jackpot on all the games rises until it is won. Microgaming's Mega Moolah is a great example. This game seeds at $10 million and keeps growing until it is won at any of the Microgaming casinos offering it.

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The Best Slots Online with Big Real Money Wins to Date

There are some top slots that feature all the time. These are the best online slots offering big wins and they all come from a leading software developer. These games offer the best gaming experience, have high-quality graphics, immersive sound effects, and the features that players enjoy. Below are the top online slots to play if you are looking for big wins in 2024. You can try them for free with the fun play option.

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Top 10 Best Casino Slots Game Software Providers

The best online casinos are those that have the best games. These games come from top software developers and have stunning graphics and dynamic features so they run your desktop or on mobile devices such as iPhone and Android. The games are available in no download instant play formats. These software developers are licensed by relevant gambling authorities and their games are tested for fairness. They are always looking at producing better and better games so players get more and more enjoyment.


Based in the Isle of Man, Microgaming was established back in 1994. They are one of the world's biggest online slots developers and they have hundreds of games to choose from. Their top titles include the progressive jackpot Mega Moolah, Immortal Romance, 108 Heroes, Centre Court, Playboy, Wheel of Fortune, Thunderstruck II, and Alaskan Fishing. You can play the best Microgaming slots at our featured Microgaming casinos for 2024.


NetEnt is a Swedish software developer and the closest rival there is to Microgaming. This company is responsible for some of the top slots found at sites including big names like Starburst, Fruit Shop, Piggy Riches Megaways, Twin Spin, Gonzo's Quest, and Mega Fortune their top progressive jackpot title. They offer plenty of great free spins bonuses and their Mega Joker has the highest RTP of any at 99%. Try out the best NetEnt online casinos in 2024 with one of our featured no deposit bonuses.


IGT has its headquarters in London as well as offices in Las Vegas and Rome. They are known for producing some excellent branded video slots such as Family Guy, Cats, Da Vinci Diamonds, Cleopatra, Wolf Run, and Pharaoh's Fortune. They have more than 1,000 games to choose from meaning there is always something for every real money player. For more check out our reviews of the IGT casinos online for 2024 and claim a free spins bonus.


WMS or Williams Interactive was founded in 1943 and is responsible for some of the best land-based casino games. The company was acquired by Scientific Games in 2013 and has continued to be a popular choice for many real money players. They have a superb collection of branded options including The Wizard of Oz, Kiss, Star Trek, Bruce Lee, and Elvis. Other titles include Zeus, Heidi's Bier Haus, Giants Gold, Jungle Wild, and Super Monopoly Money. The titles can be played for free in demo mode or for real money at any of our featured WMS online casinos in 2024.


Aristocrat was founded in 1953 and has its headquarters in Sydney, Australia. It has been responsible for the creation of some superb land-based and online titles including 5 Dragons, 50 Lions, Buffalo, Choy Sun Doa, Queen of the Nile, Wolf Moon, and Where's the Gold. The company holds licenses in nearly 300 jurisdictions around the world. To play any of these amazing top casino slots for free or real cash, be sure to check out our recommended Aristocrat casinos for 2024.


Playtech offers players a huge portfolio of around 700 games. Their branded games are what have set them apart from the competition with links to DC Entertainment and at one time a collection of branded Marvel slots. Popular titles include Flash, Gladiator, Great Blue, Baywatch, Iron Man, Spiderman, Superman, and more. You can play these games for free in the demo fun play option with no download and no registration at many of our top Playtech online casinos in 2024.

Play'n Go

Play'n Go is a Swedish software develop with a range of exciting and popular slots for players to enjoy. This includes the Rich Wilde series, Book of Dead, and Troll Hunters which are popular adventure-themed games known for their storytelling and exciting features. The bonus rounds really excite players and there are some very generous free spins bonuses to claim at Playtech online sites in 2024.


Betsoft produces some of the best 3D slots for casinos in 2024. They are known for their entertaining titles such as The Slotfather and Good Girl Bad Girl and their Slot3 series. Over the past number of years, they have paid particular attention to mobile optimized titles. Their games are available to try for free at many of the top international online casinos we have reviewed on our site.


RTG or RealTime Gaming is one of the best US online casino software providers in 2024. They offer over 300 games and their Real Series of slots with random jackpots really helped them to excel in the market. Popular titles for this provider include Enchanted Garden, Cash Bandits, Megasaur, and Aztec's Millions. Some of the newest slots from this online casino software provider feature boiling point jackpots and Spirti of the Inca is a popular choice with real money players.

Yggdrasil Gaming

Yggdrasil was established in 2013 and all their titles are created using HTML5. They create high-end games that were initially for the English and Finnish markets but are now available worldwide. They mythology themed slots have proven to be hugely successful with titles such as Vikings Go to Hell, Valley of the Gods, Ice and Fire, and Jackpot Raiders. Read our reviews of the best Yggdrasil online casinos in 2024 to find great sites and even better free spins bonuses.

real money slots features

Unique and Exclusive Features

Most online casino players are familiar with standard features such as free spins, scatters, and multipliers, but there are a large number of unique and exclusive real money online slots features that you may not have heard of. These are listed below.

Cascading Reels

This feature is popular in WMS slots and is where symbols drop down the screen when you spin a winning combination. The winning symbols explode and disappear off the reels and the symbols above drop into place giving you the chance to create a new winning combo.

Cluster Pays

This is a feature as well as a mechanic of the game. It replaces the standard paylines and both ways wins mechanism with a matching symbols grouping feature. It is played in grid format and you can grow groups of up to 20 symbols.

Mystery Symbols

If you like surprises, you'll love mystery symbols. They often appear as symbols with question marks and then they flip over to reveal the surprise. It can be big wins and even stacked symbols.

Win Both Ways

Win both ways is a feature that lets you create winning combinations from left to right as well as right to left. It means more chances to win.

243, 720, 1,024 and 4,096 Ways to Win

If you want more than 15 or 20 paylines, these slots are for you. They are multi-way wins and 243 ways to win have 243 paylines. The paylines are fixed so you have to wager on all paylines every spin. Not great if you are a low budget player. With 720 ways to win titles all you have to do is get matching symbols next to each other on an adjoining reel. With 1024 ways you are also matching symbols on adjacent reels. You are also required to have a fixed stake so again, a big bankroll. With 4096 ways, the symbols must appear on adjacent reels. These slots have 6 reels and a 4 row layout. All of these offer big wins but you may be required to bet more.


Megaways slots were developed by Big Time Gaming and there are 117,649 ways to win. Payouts are calculated in the same way as the 243 ways to win slots but the reels can accommodate different sized symbols and your winning opportunities chance with every spin.

Expanding Symbols, Expanding Wilds and Expanding Reels

Expanding features are great and allow you to win more. Expanding wilds will stretch across all the rows to form a single symbol and pay in any position. With expanding reels the reels will stretch to accommodate additional rows and symbols and offer more winning opportunities. The expanding symbols feature is usually a random symbol that is chosen before a free spins round and when it lands on the reels it will expand to cover the entire reel to give you a huge win.

Sticky Wilds/Locked Wilds

Sticky or locked wilds are wilds that stay in place for your next spin. The reels and other symbols will spin but the locked or sticky wild will stay in place. This can lead to lots more wins.

Transferring, Shifting and Walking Wilds

Transferring wilds are often found in WMS slots. They are wilds that appear on one set of reels and then copy over to a corresponding set of reels. Shifting Wilds are similar to sticky/locked wilds but when they appear they stay in place for one spin before shifting one place to the right for the next spin and so on until they disappear off the reels. The walking wild moves along the reels as the other symbols respin and is the same as the shifting wild.

Random Wilds

Random wilds are as the name suggests, wilds that appear at random during the base game. Up to 3 wilds can appear on the reels to boost your chances of winning.

Colossal Reels

The colossal reels feature is usually found in bonus rounds. It is a huge reel formed by columns merging and can lead to huge payouts.

Nudging Reels

The nudge feature allows you to push the reels up or down by one of more symbol to try and create a winning combination.

Split Symbols

Split symbols are popular some of the best IGT online slots. These are double icons that occupy one space on the reels. Wilds can often be split symbols and they give you more chances to win. In simple terms, what you get with split symbols is 2 of the same symbol on on one spot on the reel so you land two symbols at once increasing your chance to win.

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The Best Casino Slots Casino Sites Around the World

The main priority of any real money player is to find a safe casino where they can play their favorite games. Here at Top10Casinos we make sure to include international casinos as well as country specific sites that offer a range of top online casino slots. We rate and review all the sites as well as the free spins bonuses being offered so you can spend more time playing the games you love.

Best Slots Online for US Players

US players have a smaller number of online casinos than other countries and territories around the world. They also have a smaller number of software providers to choose from. Betsoft, Rival, and RealTime Gaming are the three main providers but that doesn't mean US players don't get the best online slots. To find the best real money US casino in 2024 be sure to check out our reviews and we also list the best US casino with no deposit and free spins bonuses so you can play free slots and win real money.

Top Online Slot Real Money Casinos for Europe

There are hundreds of licensed and regulated online casinos for European players to choose from. Online gambling is popular in many of the European countries including Germany, Sweden, Italy, Finland, Denmark, Norway, the UK, and more. We have dedicated pages for many of these sites. EU casinos in 2024 also have the biggest names when it comes to software developers. Players can enjoy the best slots online from Microgaming, NetEnt, Playtech, IGT, and more. These providers create innovative and exciting games for mobile and desktop and have excellent bonus features. There are smaller developers too such as Merkur for Germany, NoLimit City, Blueprint Gaming, Thunderkick, Yggdrasil, and Play'n Go. Be sure to check out our top 10 European online casinos for 2024 for the latest no deposit and free spins bonuses, and our country specific pages will help you discover even more great sites and see what the laws in these countries are.

Best Slots Sites for International Players

There are great international casinos accepting players from around the world and we also have dedicated pages for player in Canada, Asia, New Zealand, South Africa, and more. If you are looking to find the best online slots casinos for real money you can take a look at our dedicated pages and the latest bonuses for each of these countries.

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Understanding the Mechanics of the Best Casino Slots Online

When it comes to playing real money slots online, it is important to understand how these games work. These are essentially games of chance where you spin the reels and hope to create winning combinations with matching symbols. There is little to no strategy required, but understanding the mechanics can help you choose the best online slots to play.

Random Number Generator

The random number generator (RNG) is a piece of software included in slots to calculate the result of every spin. There are thousands of random numbers that can be generated to ensure the results of the spin are random every time. All licensed online casinos have their RNG audited on a regular basis to ensure fair gaming.

Payout Percentages

Payout percentage refers to the average amount of wagered money you will receive in payouts over a period of time. The higher the RTP percentage the more you can expect to win. If a slot machine has 95% RTP it will mean for every $100 you wager, you can expect a return of $95. The RTP will give you an idea of the average return you can expect over a period of time. The higher the RTP the more you can win with the exception of progressive jackpots which often have a lower RTP but a much bigger jackpot payout.

Slot Volatility

Slot Volatility is a term used to show how frequent wins will be on a particular title. There is high, medium, and low volatilitiy, and these are explained below.

Low Volatility - Excellent for Small and Frequent Payouts

Low volatility slots are often preferred by beginning players are they have frequent payouts. It is worth noting however, that the payouts are relatively small.

Medium Volatility - Great for Larger Payouts on a Regular Basis

Medium volatility options payout less frequently than low volatility titles but the payouts are larger when you hit a winning spin.

High Volatility - Large Bankrolls and Patience Required

High volatility options are the ones that will get you the biggest payouts, but these a a lot less frequent. These are often preferred by high roller players because when the wins come, they come big.

How to Play for Fun with No Registration or Download

You can play free online casino slots for fun with with no registration and no download at a number of sites including ours. We have a host of the top slots that you can try out for free right here. You can play on your PC, mobile, or tablet, so whether you have an iPhone, iPad, Mac, Android smartphone, or PC, you can practice, have fun, and try out new software providers for as long as you like. If you'd like to play for free and win real money, we also list the best no deposit casino bonuses for 2024.

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Free Online Slots vs Best Real Money Slots Online

If you want to enjoy the fun of playing slots online without any of the risks, free slots are great. There are of course some advantages and disadvantages of playing free and real money slots and the best option for you will depend on what you want to achieve. Below we've listed the advantages and disadvantages of both of free and real money slots.

Real Money Pros and Cons

Free Pros and Cons

Final Key Factors to Consider When Playing for Real Money in 2024

If you are planning to play the real money slots at online casinos in 2024, there are some things you need to keep in mind. The first of these is that slots are essentially a game of chance so there are no real strategies that you use to guarantee you win. When you are looking for the best online sites for slots you need to make sure the site is licensed and regulated and has the games you want to play. We do all this for you with our Top 10 Casinos reviews. Not all casinos are legit and in order to make sure you are safe and secure; you really do need to do your homework. Our 2024 blacklist will help you avoid scam and fraudulent sites. If these are your preferred game, be sure to check out our no deposit free spins bonuses. These allow you to play free slots and keep your winnings of real money.

Always remember when playing the best online real money slots there will also be the potential for loss, so prepare for this, set a budget, and play responsibly.

Frequently Asked Questions

Below are the answers to the most frequently asked questions we get asked about playing and finding the best slots online in 2024.

More Links to the Best Slots Games on

If you have reached this point on the page and still haven't found the best online slot machine to play for free, we've listed the most visited game pages on our site below. The game list includes options from the top online casino software developers as well as the classic vegas slot machines you'll find in your local casino. Play for free with no download or registration required!

 Bonnie Gjurovska
Written by
Bonnie Gjurovska - Lead Editor

Bonnie Gjurovska has been professionally involved in iGaming for over 5 years. She is passionate about online casinos, testing software and finding the best promotions. Her passion makes Bonnie the perfect candidate to help guide players from around the world and to oversee the content published on

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