Judged on the largest welcome offer by face value.
Ties are declared, with the tie-break named.
VerdictThe best online casino for the biggest bonus is Casumo. Casumo's welcome bonus is the largest in pounds: 50% of your first deposit up to £100.
Best for the biggest bonus
Casumo
Casumo's welcome bonus is the largest in pounds: 50% of your first deposit up to £100. To take all of it you would deposit £200 and stake £1,000 within seven days, at £5 a bet or less, after opting in.
How we judged it
This award is decided on the largest welcome offer by face value. Nothing else is taken into account, and commission plays no part.
Ladbrokes Casino. Ladbrokes' 500 spins are worth £50 at face value, with no wagering, if all ten days are claimed.
When to choose something else
Biggest is not best. Coral and PlayOJO score higher on their offers because their terms are easier to meet.
Face value and real value
The biggest bonus is the one with the highest ceiling in pounds. Face value is not what it is worth: a matched bonus must be wagered, and on average the house edge takes about 40% of a bonus at 10x on 96% slots. What is left is still the largest of the five if you deposit enough.
A worked example
Deposit £200 at Casumo and receive £100. Stake £1,000 within seven days at £5 a bet or less. On average that costs about £40 and leaves about £60. Deposit £20 instead and the same sums are £10, £100 and about £6.
What to check yourself
Work out the stakes before the size tempts you. Casumo's full £100 needs £1,000 of stakes in seven days, about £143 a day. A £20 deposit earns £10 and needs £100 of stakes, about £14 a day, which is the gentlest way to try a matched bonus.
Significant terms: 18+. New customers only. Opt-in required. 50% deposit bonus up to £100 on first deposit. Minimum deposit £20. 10x wagering on the bonus amount. Maximum bet or spin £5. Bonus valid for 7 days. Game, play and payment method restrictions apply. Full T&Cs apply. BeGambleAware.org
Read the Casumo reviewLicence: Recro Limited, UKGC account 61549. Offer checked 5 October 2026.
Scores are desk-based: they draw on each casino's published terms, the public register and recent independent reviews, not on real-money accounts. Where scores tie we say so and name the tie-break. Offer terms dated 5 October 2026. How we score. 18+. Free help: 0808 8020 133 or safer gambling.
Frequently asked questions
What is the best online casino for the biggest bonus?
Casumo, on the largest welcome offer by face value.
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