Most Popular Online Casinos in August

GambleZen Casino

Discover Nature’s Hidden Treasures with €3,625 in Your Backpack

Sign-up Bonus:

50

Free Spins

No deposit required

Terms & Conditions apply ·  Play responsibly

GambleZen Casino

Discover Nature’s Hidden Treasures with €3,625 in Your Backpack

  • 50 Free Spins · No deposit required
  • Bonus Code: GZ50
  • Exclusive No-deposit Bonus – Available in Bulgaria and Selected Countries
  • 200% Bonus up to €500 + 100 Free Spins with your first deposit (New customers)
  • Bonus available on your second and third deposit
  • GambleZen Casino offers exclusive bonuses for CasinoBonusCenter visitors
  • Bulgarian players are accepted
  • Accepts Bitcoin and other cryptocurrencies
  • Play instantly in your browser – No installation required
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Live Casino · Play against real croupiers at GambleZen Casino
  • Available in multiple languages, including English
  • Tested and certified by Casino Bonus Center · Rating: 4.2/5
  • Popularity: This offer has been claimed by 468 visitors so far this month.
  • 86 Game Providers: Platin Gaming, Ezugi, Onlyplay, OctoPlay, Fugaso, Pragmatic Play, LiveGames, XProGaming, KA Gaming, Evolution Gaming, Betsolutions, Playtech, and others.

KingSpin Casino

Join the Boss’s Inner Circle with a Tripled Starting Balance!

Welcome offer:

200% Bonus up to

€300

+ 50 Free Spins

Bonus on first deposit

Terms & Conditions apply ·  Play responsibly

KingSpin Casino

Join the Boss’s Inner Circle with a Tripled Starting Balance!

  • 200% Bonus up to €300 + 50 Free Spins with your first deposit (New customers)
  • Bonus available on your second and third deposit
  • Bulgarian players are accepted
  • Accepts Bitcoin and other cryptocurrencies
  • Play instantly in your browser – No installation required
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Live Casino · Play against real croupiers at KingSpin Casino
  • Available in multiple languages, including English
  • Rating: 3.8/5
  • Popularity: This offer has been claimed by 263 visitors so far this month.
  • 43 Game Providers: Gamomat, BF Games, StakeLogic, BRAGG, Relax Gaming, Leap Gaming, Red Rake, Blue Guru Games, ReelPlay, Skywind, Fantasma, Swintt, and others.

Rollino

Enter the Fairground with an Exclusive Bonus up to €6,000!

Sign-up Bonus:

20

Free Spins

No deposit required

Terms & Conditions apply ·  Play responsibly

Rollino

Enter the Fairground with an Exclusive Bonus up to €6,000!

  • 20 Free Spins · No deposit required
  • Exclusive No-deposit Bonus – Available in Bulgaria and Selected Countries
  • 200% Bonus up to €3,000 + 100 Free Spins with your first deposit (New customers)
  • Bonus available on your second and third deposit
  • Rollino offers exclusive bonuses for CasinoBonusCenter visitors
  • Bulgarian players are accepted
  • Play instantly in your browser – No installation required
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Live Casino · Play against real croupiers at Rollino
  • Online sports betting
  • Available in multiple languages, including English
  • Tested and certified by Casino Bonus Center · Rating: 4.1/5
  • Popularity: This offer has been claimed by 165 visitors so far this month.
  • 85 Game Providers: 1X2gaming, Platipus, Red Rake, Spinmatic, VIVO Gaming, High 5, Amatic, Pragmatic Play, Playbro, ThunderSpin, Barbara Bang, Thunderkick, and others.

Merlin Casino

Feel the Spell of Big Wins with Wager-Free Bonuses, Free Spins & Daily Promotions

Sign-up Bonus:

20

Free Spins

No deposit required

Terms & Conditions apply ·  Play responsibly

Merlin Casino

Feel the Spell of Big Wins with Wager-Free Bonuses, Free Spins & Daily Promotions

  • 20 Free Spins · No deposit required
  • Bonus Code: SPINS20
  • 120% Bonus up to €240 + 100 Free Spins with your first deposit (New customers)
  • Bonus available on your second and third deposit
  • Merlin Casino offers exclusive bonuses for CasinoBonusCenter visitors
  • Bulgarian players are accepted
  • Accepts Bitcoin and other cryptocurrencies
  • Play instantly in your browser – No installation required
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Live Casino · Play against real croupiers at Merlin Casino
  • Online sports betting
  • Available in multiple languages, including English
  • Rating: 3.9/5
  • Popularity: This offer has been claimed by 160 visitors so far this month.
  • 125 Game Providers: Wizard Games, Peter and Sons, Betsolutions, Aviatrix, Yggdrasil Gaming, Eurasian Gaming, Nemesis, SpinLogic, Red Rake, Mr Slotty, UpGaming, Fazi Interactive, and others.

Miami Club Casino

Claim 20 free spins, plus a €4,000 bonus on your first deposit!

Sign-up Bonus:

20

Free Spins

No deposit required

Terms & Conditions apply ·  Play responsibly

Explore bonuses at Miami Club Casino

Miami Club Casino

Claim 20 free spins, plus a €4,000 bonus on your first deposit!

  • 20 Free Spins · No deposit required
  • 400% Bonus up to €4,000 with your first deposit (New customers)
  • Bonus available on your second and third deposit
  • Miami Club Casino offers exclusive bonuses for CasinoBonusCenter visitors
  • Bulgarian players are accepted
  • Accepts Bitcoin and other cryptocurrencies
  • Play instantly in your browser – No installation required · Optional game downloads available
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Miami Club Casino is available in English
  • Tested and certified by Casino Bonus Center · Rating: 3.1/5
  • Popularity: This offer has been claimed by 144 visitors so far this month.
  • Game Providers: WGS Technology and DragonGaming

Ripper Casino

Kick back with all your favourite games!

Free Bonus:

$10

No deposit required

Terms & Conditions apply ·  Play responsibly

Explore bonuses at Ripper Casino

Ripper Casino

Kick back with all your favourite games!

  • $10 free! No deposit required
  • Bonus Code: TOOEASY
  • 150% Bonus up to $1,500 with your first deposit (New customers)
  • Bonus Code: RIPPER150
  • Bonus available on your second and third deposit
  • Bulgarian players are accepted
  • Accepts Bitcoin and other cryptocurrencies
  • Play instantly in your browser – No installation required
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Ripper Casino is available in English
  • Tested and certified by Casino Bonus Center · Rating: 3.1/5
  • Popularity: This offer has been claimed by 140 visitors so far this month.
  • 20 Game Providers: QuickSpin, SpinOro, Playtech, Rival, BGaming, Pragmatic Play, Mascot Gaming, Yggdrasil Gaming, Arrows Edge, Wazdan, NolimitCity, Habanero, and others.

Slots Capital

Get €100 Free with Your First €25 Deposit!

Sign-up Bonus:

15

Free Spins

No deposit required

Terms & Conditions apply ·  Play responsibly

Explore bonuses at Slots Capital

Slots Capital

Get €100 Free with Your First €25 Deposit!

  • 15 Free Spins · No deposit required
  • Bonus Code: CAPITAL15SPINS
  • 400% Bonus up to €100 with your first deposit (New customers)
  • Bonus Code: FIRST100FREE
  • Bonus available on your second and third deposit
  • Bulgarian players are accepted
  • Accepts Bitcoin and other cryptocurrencies
  • Play instantly in your browser – No installation required · Optional game downloads available
  • Mobile-friendly games · Enjoy playing on smartphones and tablets
  • Slots Capital is available in English
  • Tested and certified by Casino Bonus Center · Rating: 2.9/5
  • Popularity: This offer has been claimed by 139 visitors so far this month.
  • Game Providers: DragonGaming, Saucify, Arrows Edge, Qora Games, and Rival

Top 10 Online Casino Bonuses in Bulgaria (August 2025)

Expert-Rated Real Money Casinos with Top Bonuses

Looking for the best online casinos in Bulgaria? Our expert team has tested and reviewed hundreds of real money gambling sites to bring you the top 10 choices for August 2025. SnatchCasino, Zodiac Casino, and Grand Mondial 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 Bulgaria

Curious which brands stand out among Bulgarian 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:

  1. GambleZen Casino – Ranked as the #1 most popular online casino among Bulgarian players this month. Check why GambleZen Casino is so popular in Bulgaria
  2. SpinCity – Holds the #2 spot in popularity with Bulgarian players for August 2025. See Current Bonuses at SpinCity
  3. Sloto Cash – Currently ranked #3 among Bulgaria’s most played online casinos. View Available Promotions at Sloto Cash

Browse our expert-ranked list below and claim your exclusive welcome bonuses today!

Online Casinos BulgariaWelcome Bonus

Casino Fun, Beach Vibes, Gangster Style

Bonus of 225% up to €1,000 + 100 Free Spins

80 chances to be a millionaire for €1

80 Free Spins

Get 150 chances to become a millionaire

150 Free Spins

€3,625 in Bonuses + 350 Free Spins

Bonus of 200% up to €500 + 100 Free Spins

Casino & Sportsbook Built for Winners

Bonus of 100% up to $1,000 + 100 Free Spins

30 Free Spins for Bulgarian Players!

Bonus of 200% up to €300 + 100 Free Spins

An adventure-packed online сasino!

Bonus of 100% up to €300 + 100 Free Spins

Get ready for a wild ride!

Bonus of 100% up to $5,000

Get 100 Chances to be a Millionaire!

100 Free Spins

150 Chances to Win One Million Euros

150 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 Bulgarian players to ensure you get the biggest sign-up bonuses, top-tier games, and the most rewarding loyalty programs.