Best Slots Sites Online: 2021 Overview

We are pleased to welcome you to this guide, especially if you have come here in search of the best online slots sites!

What we have in store for you are not only the best sites. We also have information on choosing and playing the best ones, the different types, payouts, free slots, real money slots, bonuses, software providers, and the pros and cons. Are you ready to get spinning? Then let’s get to it!

Best Online Slots Sites

First and foremost, we would like to introduce you to our ultimate list of sites that are genuine slot paradises. Take a good look and see which one appeals to you the most.







Rembrandt casino

100% up to €200 with your first deposit



Mr Play

100% + up to €200 + 100 spins




300% Match Bonuses Up To $3,000


Kahnawake Gaming Commission


100% up to £100 and 100 free spins


MGA, UKGC, Lotteriinspektionen

LuckyBull Casino

100% up to €888



Cafe Casino

250% bonus up to $1,500


Kahnawake Gaming Commission


100% up to 300 USD + 150 Free Spins for Book of Sun



Stay Lucky Casino

300% up to €1000 + 100 Free Spins



Gratorama Casino

100% bonus up to $200



Lapalingo Casino

100% up to €500 bonus and 20 free spins



All casinos

Choosing the Right Game at Top Slot Sites

Knowing how to choose the right thing is quite a talent unless you know the tricks to do it right 100% of the time. Here are the main steps you’ll have to follow:

Specific Features

Nothing separates one slot from another as much as the peculiar features that each one has. It’s not surprising either, given that each game is geared towards a different type of person. This makes for thousands of themes, soundtracks, animations, and much more!


Maybe it wasn’t so important before, but nowadays we want rewards for choosing a one-armed bandit! Thank goodness that both casino operators and providers know this, which is why we have an endless amount of slots today with bonus rounds and jackpots to reward you as many times as possible!

Payout & Volatility 

Not all players have the same amount of cash in their casino accounts. And although that’s a pity, we must also look on the bright side: more types of slots! There are low volatility slots to reward you more times but for less money and high volatility slots for big jackpots. The same applies to RTP (Return to Player), from 94% to 98%.

Paylines Number

When we play to win, we want to have different possibilities of doing so. This means that depending on the game you choose, you will also find different rows, reels, and above all, paylines. These will determine where the money will come from and how versatile the slot will be.

Developers of the Software

Perhaps the most crucial aspect in the broad spectrum of online slots is the software providers. These companies are in charge of creating the games and giving you all the fun and action you need.

Slots Rating

Updated: 19 Aug 2021







Bier Haus Slot

Couch Potato Slot

Book of Ra Slot

Book of Dead Slot

Play'n GO
Gonzos Quest Megaways Slot

Red Tiger
All slots

How to Play Online Slots with 3 Crucial Tips

Now that you are probably already looking forward to trying some of the things we have talked about, we suggest you take a brief look at our tips on how to play:

The Different Types of Online Casino Slots

Did you think that everything is limited to the same type of slots, differing only in their designs, music, or colors? Not at all! There is a great variety of types, which is why we have decided to talk briefly about the two most important ones.

Bonus Rounds Slots

This is where you want to aim at if you want to get more special winnings out of your session. Bonus rounds are crucial for achieving extra spins and, above all, max payouts. Plus, they make the game much funnier!

Progressive Slots 

You probably don’t like it when the slot just eats your money, do you? Well, progressive slots are your solution for that since they add your money to the jackpot. The jackpot keeps growing until someone hits the big prize. Sounds better, doesn’t it?

What Payout Features You Have to Keep in Mind

The last important detail you need to know to become a slots expert is their payouts. We want to win money. Therefore, it would be illogical to search for the worst payouts or features. Here, we explain what you SHOULD look for and what you can ignore:


As we said before, RTP stands for the famous Return to Player. These initials are in all operator games since the mathematical calculation is always applied. In slots, it has a margin of about 7%. If we take, let’s say, a slot with a 96% RTP (which is the most common), then you can expect $96 back for every $100 you deposit.

Finding the Payout Percentage 

You don’t have to play a slot for hours to find its payout percentage. The good thing is that all games will tell you what you will give before you play. So, you can choose your slot at your leisure before you have to open your wallet.

Top 10 Slots Sites

Now that you have your slots’ brain racing, you can take a look at the best sites that offer online, video, progressive, jackpot, and much more other slots!

Besides, you can rest assured that all these sites have been verified and analyzed down to the last detail by our experts at OnlineCasinoProfy.

Top 7 Best Free Slots

Well, honestly, we had a hard time choosing the best slot for free since there are simply too many good ones. Still, we were able to narrow it down to our three favorites, which are always worth playing without having to wager any money:

Top 3 Best Slots for Real Money 

For real money options, we have decided to discuss the current three most famous games. You will try them sooner or later since they are a staple in almost all online casinos. Here they are:

Book of Dead
Mega Moolah

Book of Dead

The software provider struck gold as Book of Dead was launched. What attracts players so much is the Free Spins round and the gamble function, which guarantees incredible winnings.


The jewel in NetEnt's crown is Starburst. It is the best arcade game where everything is focused on the wild symbol. In fact, the game is so entertaining and well made that it is hard to resist.

Mega Moolah

Forgetting about the game that is in the Guinness Book of World Records would be an outright crime. This slot has the biggest progressive jackpots in online history, which gives chances of changing any players forever.

Types Of Bonuses in Online Slots

As you may have seen again and again in this article, bonuses are a big deal in slots. These are the most common ones you will (very happily) come across:

Best Online Slots Game Providers

This time, we will not limit ourselves to name only the best of the best since there is an abysmal number of software providers. Each one has its own style and successful games. 

However, the names you will encounter most often throughout your online experiences will include Microgaming, NetEnt, Quickspin, Play N Go, Playtech, Amaya, Baffy Wulff, IGT, WMS Gaming, Blueprint, Pragmatic Play, BetSoft, and Evolution Gaming.

Pros & Cons of Slots

Are there pros and cons to slots? Of course. Although, the truth is that nowadays, the advantages are many more. 



Best Slot Sites for Winning

Who would have thought that we would have such a variety of slot sites and new online slots in 2021? Online casinos are full of one-armed bandits. Many specialize in offering their customers the best bonuses on the market, exclusively for their finest slots.

Well, at OnlineCasinoProfy, we are not only experts but also slots lovers. That’s why you can always find both the best slot sites for winning in our recommended lists. Don’t miss the opportunity to hit it big with your next session, and let us know what you thought of your experience!


open answer What Are The Advantages Of Slot Machine Sites?

A slot site deals exclusively with slots, bringing together their best variety with bonuses for all types of players.

open answer How to Choose The Best Slots Sites?

There are several factors to consider, such as the software providers, payout percentages of the games, the casino license, bonuses, and more.

open answer What Are The Top Slots Online to Play?

The most famous slots are Starburst, Book of Dead, Cleopatra, Gonzo's Quest, and Mega Moolah.

open answer Do New Online Slots Offer Any Bonuses?

Of course, there are! Slots are a paradise for promotions like a welcome bonus or extra spins, which you will find in different shapes and sizes.
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