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Best Online Slot Sites 2021

Ready to set the reels spinning? We’ve handpicked the best US online casinos to play slots online. From the hottest new video slots to old cult classics, these top slot sites have games for everyone. All you need to do is compare, sign up and start playing!
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Expertly Reviewed Expertly Reviewed
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Slot Site Score New Customer Offer Expert Review Go To Site & Sign Up Terms
1. Bet MGM Casino
88%
100% Up To $1000 Deposit Bonus

Reviewed & verified by our team

"Every wager counts at BetMGM. Now when you play your favorite slots, card games and live dealer tables online, you can earn comp points for M-Life Rewards "
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New Customer Offer New customers who create verified accounts at BetMGM.com will get: $25 FREEPLAY. All BetMGM.com casino games – 150 iRewards Points Release Requirement and 100% deposit match up to $1000 FREEPLAY® – All BetMGM.com games – 6x Bonus Amount iRewards Points Release Requirement
2. Bet Rivers Casino
71%
100% up to $250

Reviewed & verified by our team

"Bonuses with low play-through requirements, iRUSH Rewards and a complete selection of progressives, slots and live dealer games are waiting for you at Bet Rivers online casino."
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New Customer Offer Make your first deposit using the bonus code 250MATCH and receive a 100% match up to $250. All Bonus Money needs to be wagered within 30 days after being credited, otherwise it will expire. Bonus Money is non withdrawable until the 1X wager requirement is fulfilled.
3. Draftkings Casino
81%
100% up to $1500

Reviewed & verified by our team

"The king of DFS now welcomes casino players. With slots, table games, video poker, keno, and jackpot games - DraftKings Casino has something for everyone."
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New Customer Offer Bonus amount is equal to that of the first deposit amount, not to exceed $1,500 (the patron must deposit $1,500 to be eligible to receive the maximum possible bonus amount of $1,500
4. Fanduel Casino
79%
$200 Risk Free Bet

Reviewed & verified by our team

"Play slots and table games direct from your phone. With bonuses for new and existing patrons, and real cash payouts within 24 hours, FanDuel is fast becoming one of America's favorite gambling apps."
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New Customer Offer 100% back on net casino losses incurred in your first 24 hours of play, up to $200. Max refund $200 in Casino Site Credit (can only be used on casino games). Bonus period begins on your first real money casino bet and extends for 24 hours. No bonus less than $5 will be awarded
5. Sugarhouse Casino
73%
100% Up To $250 on 1st Deposit

Reviewed & verified by our team

"SugarHouse is a popular US brand known for its generous low wagering bonuses and promotions. Spin the reels on the best slots from IGT, NetEnt, BTG, and many other top providers. "
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New Customer Offer The offer is to deposit and receive 100% up to $250 in bonus money with a 1X wagering requirement. Use bonus code 250MATCH when making your first deposit. Minimum deposit of $10. Bonus money will be credited to (within 48h of making the deposit) the player’s regular bonus bank.
6. Party Casino
93%
100% Up To $500 + 20 Free Spins

Reviewed & verified by our team

"Win free spins every day in Slot Races at PartyCasino. Also, enjoy a diverse gaming experience with a wide range of table games, slots, slingo, and poker variants."
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New Customer Offer First deposit = 100% up to $200 + 20 Free Spins on Melon Madness Deluxe. Second Deposit = 100% up to $150. Third Deposit = 100% up to $150
7. Golden Nugget
79%
Up to $1000 Bonus + 200 Free Spins

Reviewed & verified by our team

"Join the online gold rush at the iconic Golden Nugget Casino. Experience a magificent gambling experience with top games such as Megaways slots, jackpots, roulette, blackjack and scratchers."
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New Customer Offer Players must claim the offer from Available Bonuses and make a minimum deposit of $30 to be eligible to receive the welcome offer. Players are eligible for only one First Deposit Bonus Match. Bonus offer must be claimed with a single deposit. The maximum bonus given to any player is $1,000.
8. Caesars Casino
79%
100% Match Up To $300

Reviewed & verified by our team

"Download the app and play online at one of America's best known casinos. Earn Caesars Rewards on each bet to add more value to your real money gaming activity."
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New Customer Offer $10 minimum deposit. Players must wager the combined deposit and bonus amount 5x on slot games, 10x on video poker games, and 25x for all other games
🏆 Best Overall Score:
93%
🎁 Largest Free Bet:
$1000
🤝 Highest Deposit Match:
100%
💵 Minimum Deposit:
$10
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Getting Started

How to Start Playing Slots online

Pretty much every online casino site boasts a range of top slot games for players to enjoy. This means slots fans are spoilt for choice when it comes to picking the best site. You’ll need to be clued in on exactly what a site has to offer before you sign up to start playing. Luckily for you, Compare.bet has everything you need to know about playing slots online, from the very basics of how slots work, to claiming a bonus at online slot sites.

You can start playing online slots in just a few simple steps:

  1. Compare slot sites

    You won’t find it hard to find an online casino with slots, but it’s not as simple as signing up to the first site. From sign up bonuses to banking options and the titles on offer, there are a few factors to consider. We’ve made this easy, sifting through the slot sites on the market to bring you a list of only the very best.
  2. Sign up & verify your account

    Settled on a slot site? Time to sign up. The link on our list will take you straight to the registration page where you can create your account. You’ll need to wait for the casino to verify your identity before you can play.
  3. Deposit

    You’ll need to make a deposit to play real money games. Head to the cashier, select your deposit option and deposit amount and confirm. The very best slot sites offer instant deposits, so you can start playing in next to no time.
  4. Play

    Now for the fun part! With the money in your casino wallet, you’re ready to play. Choose a game that suits your budget, make your bet and hit spin. Fingers crossed!

How Slots Work

How do Online Slots Work?

Unlike other casino games, such as blackjack and poker, playing slots online involves little skill. Luck alone determines whether or not you’ll hit a winning symbol combination when the reels stop spinning. Whichever symbols appear on the reals are determined by a random number generator (RNG), ensuring that the outcome of every spin is random and, as a result, fair. In order to be licensed to operate in the US, every casino must use this technology to ensure fairness.

This RNG technology determines which symbol will show on each reel at the end of the spin. The outcome of every spin is separate from the previous and next spin, which means you’re never ‘due’ a win. Likewise, if a slot has just paid out the jackpot prize, there’s no saying it won’t pay out again on the next spin

How Online Slots Work

How to Play Online Slots

Slots are about as simple as it gets when it comes to online casino games- just set your bet, hit the spin button and wait to see if you get lucky. Even if you’re playing one of the latest video slots with multiple paylines and bonus features, the basic premise is the same. Sure, you might need to set your coin size and select the number of paylines you want to bet on, but that’s pretty straight forward too.

The more paylines you bet on, the more ground you cover. Just remember that your bet will multiply by the number of paylines you bet on, increasing your overall wager for that spin.

If you do land a combination of winning symbols, you’ll know about it. Music will play and images will appear on the screen to let you know that you’ve struck lucky. You’ll then have the option to use your winnings to play again or to keep them in your casino wallet.

  1. Set your bet and select your paylines
  2. Hit spin
  3. See if you land

Slot Games

Which Slots Can I Play Online

Online slots might be simple, but there’s still plenty of variety when it comes to the games on offer. Whether you’re a fan of traditional fruit-machine style slot games, or prefer all-singing, all-dancing progressive jackpot slot games, the best online slot sites have something for everyone.

Classic Slots

These slots hearken back to the days of one-armed bandits, though the symbols aren’t necessarily fruit, bells and lucky 7s. Most classic slot games have three or five reels, making it pretty easy to select your paylines, which are almost always in one direction. This simplicity makes them a popular choice among slots newbies.

Video Slots

Video slots tend to have more going on than classic slot games. Expect crazy themes, tailor-made soundtracks and graphics that could give some video games a run for their money. These games offer players multiple ways to win, with some titles offering over 1,000 paylines in every direction you could imagine. Video slots also tend to have more bonus rounds and in-game free spins than classic slots. Video slots are perfect for players looking to combine their love of online casino with their favorite films, TV shows and music genres, with software developers such as NetEnt and Playtech partnering with big production companies to create branded video slots.

Penny Slots

You don’t need to be a high roller to play online slot games, thanks to penny slots. You can bet as little as a cent per spin on these titles, which is great if you want to play real money slot games but have a limited budget. But that’s not to say that penny slots are a budget option, you’ll still get high-quality graphics, top-notch soundtracks and the chance to win big.

Progressive Jackpot Slots

This is where real slots enthusiasts get excited. Whereas most slot games have a fixed prize for winners, the prizes for progressive jackpot slot games just keep growing! However, even progressive games come in different shapes and sizes. Whereas some jackpots are specific to the online casino at which you’re playing, others are pooled between different casinos sites. Whatever the nature of the progressive jackpot, the size of the prize pool increases as players wager. These jackpots have been known to hit the hundreds of thousands, with titles such as Mega Moolah and Mega Fortune making players millionaires!

In our January 2021 interview with award-winning game studio Blueprint Gaming, Jo Purvis, Director of Marketing and Relationships, spoke to us about Blueprint’s Jackpot King progressive jackpot series and why the genre is so popular.

“There’s a large segment of players that absolutely love the possibility of winning huge amounts of money from any spin. For them, it enhances the gaming experience and adds something extra to the gameplay. Jackpot King is so successful because players have the opportunity of winning some amazing prizes, but they also get to play quality games at the same time. It simply makes for an entertaining experience, and those fortunate enough to reach the Wheel King are always on the edge of their seat in anticipation of what awaits.”

Mobile Slots

Keep your Favorite Slots in Your Pocket

With so many players choosing their mobile for online gambling, slots developers create games with mobile players at the top of the priority list. This means there’s plenty of choices when it comes to mobile slot games. It goes without saying that virtually every online slots game is available on mobile, but some of the best new slot games have been created especially for play on a smaller touch screen. Not only does this mean you can benefit from improved usability, but the graphics are also designed for mobile, which makes for an improved aesthetic, too.

Every slot site on our list has a mobile-friendly website, but the best have developed for Android and iOS, which makes playing mobile slot games a breeze. You can get from your home screen to your favorite title in just a couple of clicks. Pay by mobile slot sites make it even easier, as you’ll have everything you need at your fingertips.

Slots Bonuses

Claim Your Bonus for Online Slots

The best online slot sites reward players for choosing their site. A welcome bonus is the most common offer, but there are also other slots bonuses up for grabs through other promotions, such as happy hours and VIP rewards. You can get your hands on these bonuses at the top slot sites:

Free Spins

Free spins are the ultimate bonus for online slots. This bonus is as simple as it sounds: you can play real money slots using these tokens- no need to dip into your own wallet. Some online casinos offer a set number of spins when you make a qualifying deposit, whereas others offer free spins in relation to how much you deposit.

No Deposit Free Spins

You don’t even need to make a deposit to claim a free spins no deposit bonus. Simply sign up, verify your account and opt-in. Once the free spins are credited to your account, you’ll be in with a chance of winning real money on slots, without spending a penny of your own.

Matched Deposit

Matched deposit bonuses are one of the most common casino offers. You’ll receive a percentage of your first deposit as free casino credit. Percentage matched will vary between online casinos, ranging from 25% to as much as 200%, though there’s almost always a limit to how much credit you can actually claim. These bonuses are ideal if you’re interested in other casino games, besides slots. Of course, you can play slots with this credit, but you can also use it on the likes of online roulette and blackjack games.

Some online casinos spread the matched deposit bonus across your first two or three payments rather than in one lump sum.

No Deposit Casino Credit

These bonuses work in a similar way to matched deposit deals, but you won’t need to dip your hand into your own pocket first. Much like no deposit free spins, you have a chance to win real cash even though you’re playing for free. No deposit bonuses are usually more modest than matched deposit deals, but you can play a whole host of casino games, including online slots, with your rewards.

How to Claim Your Bonus

Exactly how you claim the bonus will vary between slot sites. While some simply ask players to opt-in during the sign-up process, others need a bonus promo code. Be sure to check the bonus terms and conditions before you sign up to make sure you don’t miss out on a deal.

Bonus Terms and Conditions

There will be terms and conditions attached to whichever online slots bonus you choose and you’ll need to factor these in when comparing bonuses. Wagering conditions apply to pretty much every offer bar no wagering bonuses, and you can’t withdraw any bonus winnings until you complete these.

On top of wagering requirements, there are also other terms to consider. Some slots bonuses may only be used for selected titles, such as the newest games. Sites may also restrict how much you can win with your bonus, how long you have to complete any wagering requirements and how much you can withdraw at once.

Slots Promotions

Offers for Existing Customers

While the most generous offers are reserved for new customers and first-time depositors, the best online slots sites provide plenty to reward returning customers. You’ll often find free daily spins, cash giveaways, free spins promotions that coincide with holidays or the release of a new game, lucrative slots tournaments.

Slots tournaments, sometimes called leaderboards, don’t actually cost extra for entry. It’s simply a promotion that adds the element of competition to a game that is designed for solo gameplay.  Each online slot site will have different rules, formats and prizes but a typical tournament format will see any winnings on slot games in a pre-determined period of time converted into a point score for a leaderboard. When the event ends, the top-ranked players will win a prize in the form of bonus cash, real money, player points and in some instances some sort of exclusive gift.

Slots

Online slots are the most popular online casino games in the US, attracting more players than roulette, blackjack or any other game type.

Free Slot Games

Play Slots Online Without Spending a Penny

You don’t need to spend a penny to play online slots. Pretty much every slot game, with the exception of progressive jackpot titles, are available in free play mode. Free online slot games are ideal if you simply want to play slots for fun or try out a new slot game before you put real money on the line.

Of course, you can’t win real money when you play free slots, but you do get to sample all the same bonus features as real money games. Whether your title features expanding reels, walking wild symbols and scatter symbols, you get to see what all the fuss is about without dipping into your own wallet.

New Slots

Try Out the Freshest Online Slot Sites

The great thing about online slot games is that there are always new titles popping up. There’s plenty to keep online slots players entertained as multiple brand new slot games are released each month. With each new release, online slots developers wow players, be that with bigger brand partnerships, higher definition graphics or bigger progressive jackpots.

High RTP Slots

Understanding High Return To Player Slot Types

It’s important to understand the return to player (RTP) percentage of a slot game before you start playing, as this gives you an idea of how much you could theoretically win. These percentages are calculated over an infinite number of spins, which means you could win more or less than this percentage of wagers during your period of play.

When it comes to RTP, the closer to 100% the better. Most online slot games have an RTP of around 90% and those over 96% RTP are generally considered high payout slots. However, some of the highest paying slots offer even higher payout percentages.

Slot Game Return to Player (RTP)
Mega Joker
99%
Jackpot 6000
98.86%
Blood Suckers
98%
Starmania
97.87%
Jackhammer II
97.1%

 

Time to Play!

Compare Slot Sites and Sign Up

Now that we’ve taken you through the ins and outs of online slots, you’re ready to head to the casino and spin the reels! Not sure where to play? You’re sure to find your best bet from our carefully curated list of top online casinos. It’s jam-packed with casinos that offer the best slots, promotions and bonuses you’ll find online. Simply compare and sign up to claim your exclusive welcome bonus today!

FAQs

Your questions, answered

Do I need an account to play free online slot games?

Yes. If you’re playing at a US slot site, you’ll need to create an account, and have the slot site verify your identity before you can start playing. These rules apply whether you’re playing free slots or real money games, though the exact account verification process will vary between sites.

References

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