Top casinos with bonuses on second deposit · Page 4 of 15
Terms & Conditions apply · Play responsibly
Kaboo
Dive into an evolving adventure with Missions, Rewards, and a World beyond imagination
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- ✓ Kaboo is available in 2 languages: English and Norwegian
- ✓ Tested and certified by Casino Bonus Center · Rating: 4/5
- ✓ 13 Game Providers: NetEnt, Games Global, Playtech, QuickSpin, IGT Interactive, Ash Gaming, GTS, Blueprint Gaming, NextGen Gaming, ELK Studios, Thunderkick, Rabcat, and Play n GO
Terms & Conditions apply · Play responsibly
Villento Casino
Start Playing with Up to $1,000 in Free Bonuses
- ✓ Japanese players are accepted
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- ✓ Tested and certified by Casino Bonus Center · Rating: 4/5
- ✓ 39 Game Providers: Blue Ring Studios, Coin Machine Gaming, Nailed It!, Circular Arrow, OnAir Entertainment, Infinity Dragon, Flip Five Gaming, Switch Studios, Area Vegas, Games Global, Neko Games, Just for the Win, and others.
Terms & Conditions apply · Play responsibly
Casino Action
Jump into the Action with up to $1,250 in bonuses!
- ✓ Japanese players are accepted
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- ✓ Live Casino · Play against real croupiers at Casino Action
- ✓ Over $5.4 Million in Progressive Jackpots
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- ✓ Tested and certified by Casino Bonus Center · Rating: 4/5
- ✓ 39 Game Providers: Ino Games, Real Dealer Studios, Neon Valley, Nailed It!, Gameburger Studios, Infinity Dragon, Snowborn Games, SlingShot, Switch Studios, Games Global, Triple Edge, Buck Stakes, and others.
Terms & Conditions apply · Play responsibly
Cosmo Casino
Unlock 150 Jackpot Spins Today for Only $10!
- ✓ Japanese players are accepted
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- ✓ Over $5.4 Million in Progressive Jackpots
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- ✓ Tested and certified by Casino Bonus Center · Rating: 4/5
- ✓ 39 Game Providers: Snowborn Games, High Limit Studio, Circular Arrow, Barstruck, Triple Edge, Buck Stakes, Nailed It!, NorthernLights Gaming, Pragmatic Play, OnAir Entertainment, Area Vegas, Oros Gaming, and others.
Terms & Conditions apply · Play responsibly
Golden Tiger
Take $1,500 in Bonuses and Win Big with the Golden Tiger’s Luck
- ✓ Japanese players are accepted
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- ✓ Over $5.4 Million in Progressive Jackpots
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- ✓ Tested and certified by Casino Bonus Center · Rating: 4/5
- ✓ 39 Game Providers: Snowborn Games, Flip Five Gaming, Neko Games, SlingShot, Infinity Dragon, Blue Ring Studios, Pragmatic Play, Switch Studios, OnAir Entertainment, Gameburger Studios, Oros Gaming, Almond Gaming, and others.
Terms & Conditions apply · Play responsibly
OptimBet
Get an Optimal Start with $500 in Casino Bonuses and Premium Sports Offers
- ✓ OptimBet offers exclusive bonuses for CasinoBonusCenter visitors
- ✓ Japanese players are accepted
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- ✓ Tested and certified by Casino Bonus Center · Rating: 4/5
- ✓ 55 Game Providers: Pragmatic Play, Amusnet, Endorphina, Amigo, Habanero, OneTouch, Blueprint Gaming, Indigo Magic, Vibra Gaming, Atomic Slot Lab, Skywind, Synot Games, and others.
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ReloadBet
Online Sports and Casino Betting · $1,000 Welcome Bonus!
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- ✓ Live Casino · Play against real croupiers at ReloadBet
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- ✓ Over $19.9 Million in Jackpots by Games Global
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- ✓ Tested and certified by Casino Bonus Center · Rating: 3.9/5
- ✓ 56 Game Providers: NextGen Gaming, Tom Horn, Red Tiger, VIVO Gaming, QuickSpin, Spribe, IGT Interactive, Amusnet, King Show Games, Givme Games, NolimitCity, Oryx Gaming, and others.
Top 10 Online Casino Bonuses in Japan (December 2025)
Expert-Rated Real Money Casinos with Top Bonuses
Looking for the best online casinos in Japan? Our expert team has tested and reviewed hundreds of real money gambling sites to bring you the top 10 choices for December 2025. BitStarz, Zodiac Casino, and SnatchCasino lead our rankings, standing out for their extensive selection of high-paying slots, immersive live dealer tables, exclusive bonuses, and lightning-fast payouts.
Most Popular Online Casinos in Japan
Curious which brands stand out among Japanese players right now? Here are the top 3 most popular online casinos in the last 30 days—each trusted for their excellent bonuses, diverse games, and reliable payouts:
- Gday Casino – Ranked as the #1 most popular online casino among Japanese players this month. Check why Gday Casino is so popular in Japan
- JackpotCity Casino – Holds the second spot in popularity with Japanese players for December 2025. See Current Bonuses at JackpotCity Casino
- MrGreen – Currently ranked #3 among Japan’s most played online casinos. View Available Promotions at MrGreen
Browse our expert-ranked list below and claim your exclusive welcome bonuses today!
| Online Casinos Japan | Welcome Bonus |
|---|---|
BitStarz Claim up to ¥50,000 in Bonuses | Bonus of 100% up to ¥10,000 + 180 Free Spins |
Zodiac Casino 80チャンスは億万長者になるために! | 80 Free Spins |
SnatchCasino Casino Fun, Beach Vibes, Gangster Style | Bonus of 225% up to $1,000 + 100 Free Spins |
Casumo Daily slots tournaments | Bonus of 100% up to $400 |
InterCasino 50 Free Spins — No deposit required | Bonus of 100% up to $500 |
888Casino Get a Free Spin on the Wish Wheel | Bonus of 100% up to $1,000 |
Betsson Sportsbook, casino, live casino | Bonus of 100% up to $100 + 50 Free Spins |
Grand Mondial ジャックポットが当たる150回のチャンスをゲット | 150 Free Spins |
betsafe The best games, all in a safe place | Bonus of 100% up to $200 + 200 Free Spins |
EnergyCasino Triple-Powered Welcome Bonus | Bonus of 100% up to ¥25,000 + 400 Free Spins |
* Terms & Conditions Apply · Play responsibly
With nearly two decades of experience in the industry, CasinoBonusCenter.com has been analyzing and comparing online casinos since 2006. Our dedicated team of professionals has handpicked the most trusted casinos for Japanese players to ensure you get the biggest sign-up bonuses, top-tier games, and the most rewarding loyalty programs.
