Best Slot Sites in the US for September 2023

Here's the good news: there are thousands of online slot sites offering a wide variety of games in legal online casino states. The bad news? There are only six legal states where you'll find these slot sites. Plus, not all of them are legit, and many of them are offshore sites. 

As most players are aware, slot sites are only legal in a handful of states, and those states are incredibly strict about their legislation criteria. Legal US online casino states are New Jersey, Pennsylvania, West Virginia, Michigan, Delaware and Connecticut. 

The bottom line? If you play at one of the above licensed slot sites we recommend in regulated states, you know you’re playing on a high-quality platform that offers an excellent selection of the world’s best slot games.

If you're already in a legal state, then read on to find our highly recommended slot sites available to players in the US. Play free slots from the world's biggest developers or load up and take a spin on some slots for real money. We'll even share some tips on how to play.

We only recommend the best online slot sites that pass a strict range of criteria. We're not just looking for good slots; we want to see fully licensed gambling platforms with top security, lots of bonuses and helpful customer support. Check out the list at the top of the page for the current best slot sites plus their latest promo offer.

Additionally, here are some of the characteristics of good slot sites:

Top slot sites will offer new sign-ups a welcome bonus when they make their first deposit (or series of deposits), and they will also offer the opportunity to get bonuses on a weekly or seasonal basis, or to earn loyalty points when they play online slots. Slot bonuses can include free spins on the latest games or a deposit match bonus to give players extra money to play the casino’s games. Some offers include a combination of both, so shopping around different operator offers is key.

Checking for good security protocols is top of our reviewers' list here at Casinos.com. We only recommend slot casinos that have SSL (Secure Socket Layers) encryption that protects player's bankrolls and personal data. Additionally, the online slot casinos that offer these games are all licensed and regulated by the states in which they are located.

It goes without saying that to be considered a top slot site, the online casino must have an excellent selection of slot games. Good casinos online will offer hundreds, if not thousands, of the latest online slots. You should be able to choose from old-school 3-reel games or the newest bonus games with big jackpots and online casino free spins offers. Casinos should also have partnerships with a range of major slot software providers.

The beauty of online slot sites is that you can often try out games for free before you pay. Select the demo play option, if available, and gamble with play credits on a range of exciting free slot games. The gameplay will be exactly the same as in the real money versions, although the win rates will differ.

All good online slot sites will offer a compatible mobile version of their games. The best mobile slots are specially adapted for your device, so you can simply log in via a smartphone or tablet to play. The mobile-optimized slots adapt to fit smaller screens, and functions like spin and coin size are accessed via touch buttons.

There are dozens of reputable slot providers offering games in the US right now. The best online slot sites will have a good selection of leading manufacturers who are properly licensed and audited. They offer the latest games you won't find in your local brick-and-mortar casino.

How good is the range of payment options? Are US bank and credit cards standard and what is the success rate? Does the casino offer PayPal or Skrill or other payment types that don’t expect you to give your banking info to the casino? If you’re planning to play slots online, funding your account should be easy and convenient, through a payment method you prefer. We test every online casino to check for payment method availability, withdrawal times, and whether there are any fees.

No one wants to wait weeks for a cashout to be processed. The best casinos that payout fast will ensure you have your money within a few days. E-Wallet transactions should be processed immediately, and players should have the option to reverse their withdrawal.

Variance, or volatility, is the regularity with which a slot pays out. Volatile slots pay out big prizes but they are infrequent. Low-volatility slots pay small cash prizes more often. You can usually work out the variance after a period of play.

When you play online slots with real money, you’ll always have the chance to earn free cash. Casinos are always keen to retain players, and they achieve that through various bonuses and promotions. Many people are looking for no deposit slot bonuses. You'll be pleased to know that these slot promotions are readily available at our recommended sites. Other exciting promos that let you play slots for real money include:

Deposit Match Welcome Bonus

The best way to earn free cash at a casino is by claiming a deposit match bonus. Make your first deposit and play eligible slots in order to clear your bonus. Clear the bonus funds within the set time period and you’ll be rewarded with free cash. Here’s how it works:

• The online casino awards new signups with a 100% welcome bonus up to $500 (for example). That means, if you deposit up to $500, the casino will match it with the same amount in bonus funds.
• All slots contribute 100% toward the bonus. So, for every dollar you play, you will clear a dollar of bonus cash.
• The bonus will carry a wagering requirement. It could be anywhere from 10x to 50x the size of the deposit. To clear the money, you must meet the wagering requirement.
• If you deposited $100 for a 100% bonus with a 25x wagering requirement, you would have to bet $100 x 25 ($2500) on slots before withdrawing your free $100.

Free Spins Welcome Bonus

As a new signup, you can also claim free spins. It’s a great way to enjoy online slots for real money with no deposit.

In a free spins bonus, you receive a number of free games on selected slots. Play the spins at permitted stakes and rack up some winnings. To release the winnings, they must be wagered several times over.

Reload Bonus

You can also claim a reload bonus as a regular online slot game player. It’s a good way to earn free money after your welcome bonus has expired. Typically, an online casino will only match the reload 25-50%.

To claim a reload bonus, make another deposit and opt in to the promotion. Play your favorite online slots and clear the bonus funds, remembering to meet the wagering requirement.

Keep in mind, always view the terms and conditions related to any bonus you are considering. This will help you to understand what you will need to do to maximize your slot bonus. Quick Tip: Be on the lookout for large bonuses with low playthrough requirements.

Slots Tournaments & Leaderboards

Some casinos offer slot tournaments and prize giveaways. Play a number of free spins within the allotted time period. The highest winners will climb the leaderboard and claim a share of a prize pool.

Loyalty Program

As a regular slots player, you will be eligible to join a casino loyalty program. Play regularly and earn points the more you gamble. As you earn player points, you can claim privileges like faster cashouts, free spins and prize giveaways.

To start, you need to create an account at an online casino or slot site. Most will offer new players a casino welcome bonus, so choose a site that offers a slots bonus that appeals to you. To sign up, you will need to:

• click on the link on this page
• fill in the information on the sign-up form at the casino
• verify your identity by providing the documents that the casino will request

Once your account is ready, you can make your first deposit. This is usually when your welcome bonus will kick in, because most new-player offers are matched to the amount of your first deposit. Some slot sites will also include a bundle of free spins. Once your account is funded, you can head over to the slot game section.

Every good online casino will have dozens of video slots available to play for free as well as real money slots. Most casinos split their games by type, and great slot sites will have an entire section (or more than one) dedicated to slot games. The best slot sites will split these games by categories, and let you search for your favorite game or add selected games to a Favorites list.

In the early days of online casinos, you would need to download casino software onto your PC to play, but the technology has advanced so much you can access most sites directly through your browser, whether you play on mobile or desktop devices. As long as you have a secure internet connection and funds in your account, you are ready to play!

The beauty of online slots is that you can spin those reels whenever, and wherever, you like. There's no need to travel hundreds of miles to Las Vegas or your nearest casino. Just load up your PC or casino app, log on, and start spinning in minutes at an online casino in your state.

So, why choose online casino slots over a land-based one? Game variety is the biggest plus. Your local brick-and-mortar casino has space limits that online casinos simply don’t. This means that their online slot games can number into the thousands – and you can sign up at several online casinos and switch between them in seconds. If you live miles away from your nearest land-based casino, you may have very limited choices. Online slots also offer higher payout rates than traditional casino slots, which is one of the biggest reasons for their popularity.

Many online gamblers will be on a budget too. Top slot sites will let you play games for as little as $0.01 a spin. Those kinds of stakes aren't always available in a land-based casino. Of course, high rollers are also catered to. High-limit gamblers can bet for as much as $500 or $1,000 a spin - and even $5000 - at many online slots sites.

Indeed, when it comes to casino games, there are few that are more accessible to newer players than slots because of these advantages:

• Low minimum betting limits.
• Large jackpots topping $1 million.
• Extensive range of options to suit all players.
• Interactive mini games and bonuses.
• Multiple ways to win and easy cash out procedures.
• Auto-play features and in-game help.

Online slot sites will offer a wide range of slot types for players. The hardest choice you may have is selecting the best slot games. Here are some of the typical game varieties you should find at the best slot sites in the US.

3-Reel Slots

3-reel games have been around since the earliest days of slot machines. 3-reel games have simple payline structures, a low range of stakes and minimal bonuses.

5-Reel Slots

5-reel slots allow for more paylines and more action. Choose a range of coins and trigger wilds, scatters and big bonus features when you play.

Classic Slots/Fruit Machine

Classic slots will be familiar to anyone who's played in Las Vegas. Games can come in 3-reel, 5-reel or even 6-reel formats and feature classic fruit symbols such as cherries, melons and plums.

Video Slots

Most online slots are video slots. They usually offer superb sounds and graphics, a range of themes, interactive bonus levels and other features. Reel numbers and paylines vary, and some of the best video slots include innovative mechanics and features like Megaways, Cluster Pays and Sticky Wilds.

Progressive Slots

Progressive jackpot slots give you the opportunity to win a huge sum of cash. Unlike fixed jackpots, progressives are linked across networks, and a portion of every bet made on a progressive slot goes toward a linked jackpot. Some progressive jackpots, like Mega Moolah, start at $1 million, and grow from there until the pot is won. Depending on the game, the jackpot can usually be triggered at random or by playing special bonus games.

3D Slots

3D slots are perfect for players who want to experience the latest HD graphics and sound. 3D games have animated intro sequences, immersive and innovative bonus features and slick soundtracks.

Put your competitive streak to good use by getting involved in slot tournaments. Available at some of the top US slot sites, these tournaments involve competing against other slot players in a race to first place. The winner is the player who scores the biggest wins throughout the tournament. 

There are all manners of slot tournaments to explore at various operators. Check out Caesars Palace Online Casino in New Jersey and BetMGM NJ Online Casino for some of the best variety. If you’re a high-rolling bettor, slot tournaments have the potential to reward you with extra prizes alongside your regular gameplay.

The best online slot sites will make it easy for you to deposit funds into your account, so you can hit the reels right away. Look for sites that offer a variety of payment options, and if you have a preferred payment method, you can browse for it on the Casinos.com slot sites list. Most sites will offer debit and credit cards, but the better sites will give you a range of other options too.

No matter which option you choose, your payments are fully encrypted and safe from third-party interception.

Play+

Exclusive to casinos in the US, Play+ is a cashless prepaid card that offers one of the swiftest transaction speeds on the market. You can find branded Play+ cards at sites like Caesars, BetMGM, and BetRivers Casino in PA.

Credit card

Credit and debit cards are widely available at US casinos. You can use a range of credit cards to make deposits and withdrawals, including Visa, Mastercard, and Discover.

PayPal

E-wallets are increasingly becoming the preferred way to pay, and PayPal is perhaps the most popular of all. Players with registered PayPal accounts can take advantage of one-tap payments and pre-saved banking details for faster transactions.

Skrill

Another popular e-wallet, Skrill, operates similarly to Neteller. Make sure to check the T&Cs of any bonus you want to claim, as casinos will often exclude Skrill payments.

ACH

Otherwise known as ‘direct payments,’ ACH is an online banking option that lets you transfer funds from one account to another. Due to the high security of ACH transfers, withdrawals can take longer than other payment methods.

There are dozens of online slots providers currently available in the US. Some of the larger developers now have licenses specific to regulated states, so they can supply online casinos in New Jersey, for example. Each developer offers its own unique game styles and bonus features. Some developers also offer a range of big-money progressive jackpots. These are linked across all participating online casinos in the US.

Aristocrat is one of Australia's oldest and best-known slots manufacturers. As well as producing most of Australia's land-based slot machines for casinos and clubs Down Under, Aristocrat also supplies its most popular games to the Las Vegas market. You can now play hundreds of top Aristocrat slots online and on mobile.

NextGen is a recognized brand in the online slots industry and forms part of the Canadian firm, NYX. NextGen first supplied legal online casino games such as Doctor Love and Mad Mad Monkey in New Jersey back in 2017.

Most players have heard of Microgaming, which was one of the first software developers to create games for the emerging online casino market over two decades ago. In 2022, Microgaming was bought by Games Global so its extensive portfolio of popular video slot games, Blockbuster slots, and progressive slots like Mega Moolah, is now available under the Games Global brand.

One glance at an online casino’s slots library will tell you that IGT is one of the most iconic developers around. Founded in the early 1990s, IGT is responsible for numerous classic slots, including Da Vinci Diamonds, Golden Goddess, and Cleopatra.

With over 70 years of industry experience, Light & Wonder, which was formerly named Scientific Games, ranks very highly with US bettors. Switching its attention from physical pinball slots to online gaming, Light & Wonder and its various subsidiaries (including Bally, WMS, and Barcrest) dominate a massive share of the iGaming market.

This Swedish provider is planted firmly within the upper echelons of slot development. Famous for its six- and seven-figure progressive jackpots, you’ll see NetEnt slots like Divine Fortune and Starburst at almost every online casino.

As long as you have a mobile device and an internet connection, you can play your favorite online slot games from anywhere and at any time. All of the slot sites we recommend are built on HTML5 technology, meaning you can access them from a mobile browser. However, many casinos have a compatible mobile app available for download. US bettors can enjoy all the best online slots (plus some exclusive mobile-only bonuses) when gambling through a mobile app.

At most of the online slot sites available in the US, you will be able to enjoy a range of freeplay and real money slots. The main difference between demo and real money slots is the ability to win cash payouts. 

Free slots don’t require a deposit to play, and you play with virtual currency that has no real money value. This means that you can’t win real money, but you can get a feel for the game, explore its features and learn the paytable without risking your bankroll.

Online slots have a wide variety of terms that might seem confusing to new players. Here's a handy breakdown of the most common slot phrases:

• Bet: The wager placed on every spin of the slot.
• Bonus Feature: A bonus feature can be triggered at random or by landing special symbols on the screen during a spin. Bonuses can range from free spins to a prize wheel with the chance of winning a random prize.
• Classic Slots: Classic slots often have minimal bonus features and nostalgic symbols such as fruit, bells and BARs.
• Coins: Many online slots let you adjust the number of coins, and the coin size. A coin might be as low as $0.01 or as high as $100, and you may be able to play for 1-10 coins per spin.
• Free Spins: Free spins can mean multiple things. Online slot casinos will offer free spins as an incentive to new customers. Then there’s a free spins bonus, which is common to many online slots. Land three scatter symbols and earn a set number of free games, often with a prize multiplier attached.
• Paylines: The paylines are the available combinations of symbols that will award prizes. You will find the payline layouts in the paytable. You win cash by filling a horizontal line with matching symbols.
• Paytable: The paytable lists the payouts for all symbols, and any bonus feature details. You will also find information such as RTP (Return to Player percentage) and paylines.
• Progressive Jackpot: A progressive jackpot is a linked prize made up of portions of every qualifying bet. Usually, 1% of every bet goes toward a progressive. It can be triggered either at random or by activating a special bonus game.
• Reels: Reels are the vertical drums which spin on every game. Payouts are made by lining up matching symbols on horizontal paylines.
• RNG (Random Number Generator): Every slot is governed by the outcome of a Random Number Generator. Algorithms determine where the reels stop on every spin. RNGs are routinely tested by approved casino auditors.
• RTP (Return to Player percentage): The RTP is the theoretical long-term payout made in a slot. Most good online slots will have an RTP of 95-98%, but it doesn't mean a game will pay out regularly.
• Scatters: Scatters are special symbols that will pay a prize regardless of where they appear on the reels. Simply, scatters don't have to form part of a payline for you to win money. You usually receive a cash payout for hitting at least two scatters, but you may trigger a bonus feature for landing three. These scatter symbols may trigger a free spins bonus or a unique progressive jackpot.
• Spin: Each “game” on a slot machine, similar to a roll of the dice, a spin of the roulette wheel or a hand of blackjack.
• Video Slots: Video slots are slots that use computer programs to determine the outcome of spins rather than mechanical components. Video slots first appeared in Vegas casinos in the late 1970s. As microprocessors improved, so did the graphic displays and the bonus features. Video slots now have full HD graphics, touch screen capabilities, and massive linked jackpots across many hundreds of machines.
• Volatility/Variance: Slot volatility or variance is the frequency with which you hit large or small payouts. A low-variance slot pays out lots of small, but frequent prizes. A high-variance slot may pay out larger prizes but less frequently.
• Wilds: Wild symbols are jokers that can fill in the gaps in winning paylines. Wilds usually substitute for all symbols other than the scatters. Wilds can sometimes have multipliers attached which help boost the payout. There is also an “expanding wild,” which is a special wild that will stretch to fill all other positions on its reel. It replaces all other symbols in the game to help complete a winning combination.

Our experts have unearthed the very best online slot sites with the best selection of slot games and fantastic bonuses and promotions. Whether you're looking for a top regulated online casino in New Jersey, Pennsylvania or any other state with legal online casino gaming, we have it covered. At Casinos.com, you can use our comprehensive list of slot sites to get to the best places fast.

It’s tough to know what to believe when you are on the internet trying to do your own research. That’s why we do the heavy lifting for you, and you can trust our process to find you the best legal and regulated online slot sites in the US. Sign up for free, claim a bonus and start your US slots journey off the right way.