Online casino basics

What to know before you play

• Licence first. Only use casinos licensed by the UK Gambling Commission. The licence number is usually in the site footer.
• RTP and volatility. RTP is the average return over time: a 96% slot keeps about £4 of every £100 staked. Volatility is how much results swing from session to session.
• Game choice matters. European roulette has one zero and a lower house edge than American roulette. Blackjack with basic strategy has one of the lowest edges of any casino game.
• Bonus wagering is capped. Since 19 January 2026, UK-licensed casinos can’t set wagering above 10x. Lower is better, and no-wagering offers pay winnings as cash.
• Slot stake limits. £5 per spin for players aged 25 and over, and £2 per spin for 18 to 24-year-olds.

How online slots work

Every spin on an online slot is decided by a random number generator (RNG) the moment you press spin. Previous spins have no effect on the next one, so a slot is never “due” a win. UK-licensed games are tested by independent labs to check that the RNG is fair and that the game pays out at its stated return to player.

Two numbers tell you most of what you need to know about a slot:

• RTP (return to player) is the share of all money staked that the game pays back over millions of spins. A 96% RTP slot pays back £96 for every £100 staked on average, so the house keeps £4. Over a single session your result can be far above or below that.
• Volatility describes how the wins are spread. Low-volatility slots pay small wins often. High-volatility slots pay less often, but the wins can be much bigger, so your balance swings more.

UK rules also shape how slots play. Since October 2021, autoplay and turbo or “quick spin” features are banned, each spin must take at least 2.5 seconds, and games can’t celebrate a return that is less than your stake as if it were a win. Since 2025, stakes are capped at £5 per spin for players aged 25 and over and £2 per spin for 18 to 24-year-olds.

Table games and the house edge

The house edge is the casino’s built-in advantage on a game. The lower it is, the longer your money tends to last. It varies a lot between games and even between versions of the same game:

• Roulette. European roulette has a single zero and a house edge of about 2.7%. American roulette adds a double zero, which almost doubles the edge to about 5.3%. If you have the choice, play European.
• Blackjack. Played with basic strategy (the mathematically best decision for every hand), blackjack has one of the lowest edges in the casino, often around 0.5% depending on the table rules. Guessing or playing on hunches costs far more.
• Baccarat. Betting on the banker has an edge of about 1.06% after the usual 5% commission. The tie bet looks tempting but has a much higher edge.

No betting system changes the house edge. Doubling up after a loss, for example, only changes how your results are spread, and it can empty a balance very quickly.

Live casino

Live casino games are played with a real dealer, real cards and a real wheel, streamed from a studio to your phone or computer. The rules and odds match the digital versions, but the pace is slower and you can see each round being dealt. Live games often count for less, or nothing, towards bonus wagering, so check the terms before you use bonus funds on them.

How casino bonuses work

Most UK casinos offer new customers a welcome bonus. The common types are free spins on a named slot, a matched deposit bonus (for example 100% up to £50), and no-wagering offers where any winnings are paid as cash. Before you claim one, check:

• Wagering. How many times you must play through bonus funds or winnings before you can withdraw. Since 19 January 2026 this is capped at 10x for UK-licensed sites. Our wagering requirements video explains how to work it out.
• Maximum bet. Most bonuses limit how much you can stake per spin while wagering. Going over it can void the bonus.
• Game weighting. Slots usually count 100% towards wagering, while table and live games may count for little or nothing.
• Time limits and caps. Free spins and bonus funds expire, and some offers cap how much you can win.

Since January 2026, UK operators also can’t offer mixed product promotions such as free spins for placing a sports bet. Our guide to the mixed product promotions ban explains what changed.

Because every casino game has a fixed house edge, there is no value betting at the tables. The only value is in bonuses with fair terms, and our guide to casino bonus value shows how to work out what a bonus is really worth.

Deposits, withdrawals and ID checks

UK casinos accept debit cards, e-wallets such as PayPal, bank transfers and some prepaid options. Credit cards have been banned for gambling in the UK since April 2020. Some bonuses exclude certain e-wallets, so check the terms before your first deposit.

Every UK-licensed casino must verify your age and identity, usually by checking your details electronically when you sign up and sometimes by asking for a photo ID or proof of address. Complete this early so your first withdrawal isn’t held up. Withdrawals normally go back to the method you deposited with, and timings range from a few minutes to several working days.

Safer gambling tools

Licensed casinos must offer tools that help you stay in control, and it’s worth setting them up before you play:

• Deposit limits cap what you can pay in each day, week or month.
• Reality checks and session limits remind you how long you have been playing.
• Time-outs lock your account for a short break.
• Self-exclusion through GAMSTOP blocks you from every UK-licensed gambling site for six months, a year or five years.

Many banking apps also let you block gambling payments. If you use one account for sports and casino, the same limits usually apply to both: see one sports and casino account for how that works.

Comparing casino offers

When you compare casino offers, weigh the effort against the reward. A no-wagering offer with a small deposit is usually lower risk than a large match bonus with 10x wagering. Check the qualifying deposit, the wagering, any cap on winnings and the time limit. Our offers page shows these side by side.

Unsure about a term? Our glossary of betting and gambling terms explains the jargon in plain English, and how we rate offers sets out how we check every deal we list.