Top US online casino sites to play free slot games

By Michael Kates @TheRealDocKates

Looking for the best free online slots for your PC or tablet? Do you seek a legal online casino offering top games with no risk? In this guide, you’ll get the lowdown on free casino slots. Test drive the latest 3D games or bonus features without losing a dime.

Best Sites to Play Free Online Slots

You can play free slot games at all the best casinos in the US. Open an account today and test out the latest video slots from the biggest developers.

How to Play Free Online Slots

Free slot machines let you experience the thrill of online games without any of the risk. That’s the benefit of playing at top online US casinos. You can try out dozens of new slots games without losing a thing.

When you load up free slots, the online casino will give you play credits to use. Once you’ve run out, simply exit and try another game.

Luckily, the game mechanics in free slot games are mostly identical to real money versions. The only difference is you can’t win real cash. However, they are great for learning the rules, testing the volatility or practicing with a bonus game.

You can even test drive some progressive jackpot slots. Get a feel for the gameplay and rules before opening your wallet and playing for real money. Only then will you have a shot at winning an exciting progressive jackpot.

Why are Free Slots so Popular?

The beauty of free online slots is that you can test out new slots games and classic titles with no risk. They also give you a good impression of the casino software and mobile apps.

By playing free slots with no download, you can simply visit the casino game lobby and pick a game. Often, there’s no need to register an account: just open a slot game and give it a spin!

With so much choice available, it’s important you pick the right slots to spend your money on. That’s why free slots are so beneficial. You can find a theme you love and decide whether you want to play high-volatility slots or classic slots.

Most US online casinos offer a Favorites service in their lobby. Choose the free slot games you love and add them to your list for easy access.

How We Review Free Casino Slots

At, we only highlight the very best legal casinos offering free slot machines. Our testing criteria is solid so you can find the top slot casinos in no time.

Range of Free Slots: All of our recommended casinos come with a broad selection of slots. Choose between classic 3-reel games or the latest 3D 5-reel slots, all for free.

Biggest Developers in the US: Some of the world’s most well-established slot game developers can now provide online slots legally to American players. The top online casinos offer a spread of games from leading manufacturers like NetEnt, Bally and IGT.

Fair Online Gaming: Regulated online casinos in the US provide a safe haven for gamblers. You will only get access to fair free online slots that have gone through rigorous testing. Plus, all top casinos are regularly audited to make sure the random number generators are fair and reliable.

Fast and Fair Deposit Options: It’s great to play free slots, but eventually you’ll want to deposit some cash and try real-money games. Our team makes deposits via a range of accepted banking methods, like Play+, Visa, PayPal and prepaid cards. If a casino falls short on processing times, we’ll know about it.

Great Slots Bonuses Every Time: You can also earn money by playing free slot games. Many casinos offer a free spin bonus on the latest games. Just play your free spins and meet the wagering requirements in order to unlock real cash in your account.

The Different Types of Free Slots

Most casinos offer demo versions of all their slots. Simply select the Practice Play or Demo Play tab in the lobby to load up free slot machine games.

3-Reel slots: 3-reel video slots resemble the classic games you’ll find in your local casino. 3-reel slots feature a handful of paylines and nostalgic symbols like melons and bells. These classic slots also tend to lack complex bonus features.

5-Reel slots: The majority of online slots today have 5 reels. With 5 reels, it’s possible to fit more paylines into the game. It also allows the developer to cram in as many bonus features as they like.

The number of available paylines in a 5-reel slot can vary, but it’s common to see anything from 9-99 win lines. Some modern 5-reel slots have expandable reels that can accommodate thousands of win ways.

Progressive slots: In a progressive slot, a portion of every qualifying bet contributes to a giant jackpot. You can trigger the jackpot by playing a special bonus game. Some progressives, however, are awarded totally at random.

You can even try out a progressive free slot game. You won’t be able to win the jackpot, but you can get a feel for the mechanics.

Branded slots: Branded slots are usually produced in partnership with film or media companies. They might be based on the career of a musical group or themed around a hit Hollywood movie. Branded games usually feature authentic video and audio footage – perfect for fans.

Video slots: The original land-based video slots used computer chips and video screens to display the action. Now, all online slots are video slot games. They use computer graphics and random number generators to determine the action.

3D slots: The advance of technology has made free casino slots more immersive and fun to play. The latest 3D slots boast amazing animation and slick graphics to draw in the player. They often boast innovative bonus features too that make full use of the reels and symbols.

Megaways slots: Megaways slots are hugely popular and widely available at legal online casinos in the US. In a Megaways slot, the number of paylines varies from spin to spin. In a Megaways slot by BTG, for example, you can cram in as many as 117,000+ win lines on your spin.

Free Slots on Mobile

You can now play hundreds of free slot machines on your smartphone or tablet. The good news is that nowadays, the games at mobile casinos are nearly as varied as those found at online casinos.

Mobile slots look and feel like traditional online slots. The only difference is you make decisions by swiping the reels or tapping the game buttons. Some of the layout and graphics may be different but the bonuses and payouts will be identical.

To play free a free slot game on your smartphone, you may need to download a native app from the App Store or the casino website. Some mobile casinos also let you install individual free slots direct to your device.

In 2021, you can play a lot of free slot machine games through your mobile browser without download. Just open the casino app and load up a game instantly.

Free Slots Software Providers

In 2021, you can enjoy free online slots in the US from some of the most famous developers in town. Regulated states like West Virginia, New Jersey, Michigan and Pennsylvania only allow slots from licensed developers who have gone through full background checks.

NetEnt: The Swedish game developer is a firm fixture in US states with legal online casinos. You can take your pick from dozens of free casino slots with the latest graphics and high-volatility action. As well as branded games like Jimi Hendrix and Motorhead, NetEnt also supplies big-money progressives like Divine Fortune and Mega Fortune.

IGT: IGT made its name as a major supplier of land-based video slots around the world. In fact, IGT developed one of the very first video slot machines in the US.

Many of IGT’s best free slot games have been adapted from existing land-based machines. Enjoy the high-stakes thrills of MegaJackpots Cleopatra or soak up classic slots action in 7s Wild and Triple Diamond.

Bally: Bally is one of the biggest slot machine providers in the world. Online, you can test out free Bally slot games like Lady Robin Hood and Sword of Destiny, or have a spin of Quick Hit Super Wheel.

WMS: Williams Interactive was bought out by SG Gaming a few years ago, but you can still try out dozens of the developer’s free slots online. WMS is known for its innovative video slots like Bruce Lee, MONOPOLY Megaways and the 6-reel Raging Rhino.

Win Studios: partyGaming’s in-house development studio is responsible for a collection of slick free online slots in the US. You’ll find Win Studios games at most casinos operated by GVC. Try Loot’en Khamum with big bonus features, or enjoy classic slot thrills with Mango Madness.

Playtech: Playtech finally entered the regulated US online casino market in mid-2020. Players in New Jersey can now enjoy Playtech’s unrivaled range of free casino slots like A Night Out and the progressive Age of the Gods range.

How to Sign Up to Play Free Slots Online

Some US casinos let you test drive free slots just by visiting their sites. Confirm that you are over 21 and then load up a free game in your browser window.

Want to get the full US casino experience? You’ll need to open a gambling account. Once registered, you can take your pick of hundreds of free-play and real-money video slots.

Here’s what you need to do:

Step 1: Create a username and password. Make sure your password is unique and hard to guess.

Step 2: Provide some personal information, including name, home address, cellphone number, email address and Social Security Number.

Step 3: Now you’ll have to verify your email. Click on the activation email to complete the account setup. The casino will also do a check that your SSN and home address are valid.

Step 4: You can also enter a promo code to claim free spins or a welcome bonus. Plus, you can make a first deposit to play real-cash slots as long as you have uploaded the relevant personal documents. You’ll need to have your driver’s license or passport to hand so you can scan them and upload.

Are Free Slots Legal and Safe?

You should only play free slot games at legal, trustworthy casinos. All of our top-rated casinos are licensed to operate in their respective state. Plus, slot providers must acquire gaming licenses in order to supply games.

When you play at a regulated casino, you know that every game is legit. The payouts and random number generators have been independently verified. The best casinos even display test certificates on their sites.

By understanding that free casino slots are legal and fair, you won’t have a problem when it comes to risking your own money on real-cash games.

Free Slots with Bonus Offers

Most free slots machines provide at least one type of bonus. You can trigger a bonus feature by landing special symbols called scatters. Some bonuses are activated at random during the main game.

Free Spins: Free spins is probably the most common type of slot bonus. A free spin bonus is triggered by landing three or more scatter symbols in any position. Some slots let you retrigger free spins indefinitely, and even add a prize multiplier for every winning spin.

Multipliers: Multipliers are special symbols that can increase your prize win. Wild symbols – jokers that help complete winning combinations – often carry multipliers as an extra reward. Some slots offer a cascading reel mechanic with added multipliers. Every time you hit a consecutive winning spin, the prize multiplier increases.

Scatters: Scatter symbols are special icons that pay out whenever they land on the reels. You will receive a cash prize for each scatter. Land three or more scatters and you may trigger a bonus game.

Megaways: Some developers, like BTG (Big Time Gaming), have adapted their game reels to offer many thousands of paylines. The Megaways range of free slots can spread over 110,000 possible ways to win on a single spin.

Re-spins: Reel re-spins are a good way of earning free money when you play. By hitting a certain combination, you may earn a single re-spin of the reels. You can keep triggering re-spins as long as you hit a winner.

Cluster pays: Slots with cluster pays differ from regular games. When you match clusters of symbols horizontally or vertically, they will explode and disappear from the reels. The symbols sitting above will then fall into their place, possibly forming new clusters.

243 ways to win: In the majority of free online slots, you win a prize for matching symbols on designated paylines. However, in a 243-ways-to-win slot, you win cash simply by matching symbols anywhere on adjacent reels.

1024 ways to win: 1024 ways to win slots are similar to 243 ways to win games, with more chances to bag a jackpot. To fit in 1024 win ways, these slots usually feature 4 rows or an added reel.

Win Both Ways: Most online slots pay out when you land matching symbols from left to right. However, win both ways free slots pay out when you match symbols from right to left too.

Explaining a Free Slot Random Number Generator

Whenever you play free slots, the gameplay is governed by a random number generator (RNG). As soon as you tap the Spin button, the RNG calculates an algorithm which determines where the reels stop.

Every algorithm produces a number that relates to a position on every reel. The process is entirely random and there’s no way of predicting where the reels will stop.

RNGs are carefully audited. Licensing bodies employ testing labs which regularly test RNGs to ensure complete fairness.

Testing bodies put RNGs through a rigorous process. They are tested over millions of spins to make sure there are no irregularities. The lab will also have pass or fail limits on which the RNG is judged.

Free Slots FAQ


Michael Kates

More than 30 years working in online gaming and sports journalism. I hope to explain the growing US online casino market to help those new to internet gambling have a better understanding.

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