Online slots are popular in Romania for three reasons: players already knew slot machines from one of Europe’s densest land-based hall networks, online versions offer far more themes and features than a hall cabinet, and licensed operators compete with bonuses. In 2026 the legal frame is strict. Only operators with an ONJN Class 1 license may offer online slots, every game must come from a Class 2-licensed supplier, and winnings are taxed under art. 110 of the Fiscal Code.
This post first appeared in May 2022 as a player-facing explainer. We have kept its structure and added the 2026 market and regulatory picture for operators and studios. For licensing costs and procedure, see the Romania gambling license guide.
How online slots work
A legal online slot in Romania runs on the game provider’s server, not on the player’s device. The core is a random number generator (RNG): for every spin it produces a number, and each possible reel result is mapped to a range of numbers. Changing the stake, playing faster or repeating the same bet has no effect on the next result, and two players on the same game receive independent outcomes.
In Romania that RNG is not taken on trust. The game, the RNG and the operator’s platform must be certified by a testing laboratory recognized by ONJN, and laboratories themselves need a Class 2 license. Studios must also register their source code, so a certified build can be compared with the one that is live.
Themes, effects and variety
Romanian players inherited a taste for classic fruit machines and card-symbol games from the land-based halls, and those themes still sell. Online play adds what a cabinet cannot: hundreds of titles in one lobby, treasure-hunt and mythology themes, bonus rounds, multipliers, gamble features that double a win, and sound and animation designed for a phone screen. Variety keeps players from tiring of one game; the number of lines, volatility and feature mix vary from title to title.
Where to play slots legally in Romania
The 2022 post gave players three tests. They still apply, with sharper legal edges.
Legal online slots
ONJN is the only authority that licenses gambling in Romania. An online casino offering slots to Romanian players must hold a Class 1 license for remote gambling and an annual operating authorization. Players can check the operator and its domain in the ONJN Class I register; on 5 October 2026 it listed 28 license rows covering 92 domains. A site that is not there is unlicensed, and ONJN’s blacklist of unauthorized domains held 2,881 entries on 25 September 2026. See how sites get blacklisted.
A broad slots portfolio
A large catalog signals a serious operator, but in Romania it also signals a compliant supply chain. Licensed operators may contract only Class 2-licensed suppliers, and since Law 107/2024 a supplier that serves an unlicensed site accessible from Romania risks a RON 150,000–200,000 fine and revocation of its license. Studios that want shelf space in Romanian lobbies need their own license first.
Bonuses
Bonuses remain the main acquisition tool, and most carry wagering requirements and other conditions. The advice from 2022 stands: read the terms before claiming. Operators should note that bonus advertising is now restricted. Bonuses may be promoted only on the operator’s own sites and premises, licensed affiliates’ sites, or to players who opted in, and audiovisual gambling ads may not use public figures or influencers since October 2025.
The market in 2026
Two trends have reshaped Romanian slots since 2022.
Online overtook land-based. H2 Gambling Capital figures reported in May 2026 put online gambling at about 71% of the Romanian market, up from 52% in 2023. The Court of Accounts recorded RON 7.3 billion of online gambling revenue in 2023. Industry estimates put online casino, which is dominated by slots, at roughly a third of online activity, with sports betting the larger share; these estimates vary by source.
Slot halls are shrinking. The number of land-based slot machines fell from about 80,000 to about 36,000 in two years, after Law 107/2024 closed venues in towns under 15,000 residents and OUG 7/2026 gave local councils the power to authorize or ban gambling halls. Some displaced demand moves online, to licensed sites and to the black market. We cover the land-based side in OUG 7/2026 and slot machines.
What a slot studio needs to enter Romanian lobbies
Popularity on the player side creates demand on the supply side. A studio, aggregator or remote game server provider that wants its slots in Romanian casinos needs four things in place.
- A Class 2 license for the production and distribution of gambling software, held in the studio’s own name. Aggregators need one for the aggregation activity, and every studio they distribute must be licensed as well.
- Certified games. Each title, its RNG and its return-to-player configuration must be certified by a laboratory recognized by ONJN. Certificates issued for other markets help but are not automatically accepted.
- Source-code registration. Builds supplied to Romanian operators must be registered and retained, so that the certified version can be matched to the one running live. Registering proprietary software with ORDA, the Romanian Copyright Office, keeps the IP position clear.
- A clean distribution list. The studio must be able to show that it does not supply operators that accept Romanian players without a Class 1 license, directly or through an aggregator. Contract clauses and geo-blocking evidence are what ONJN and operators ask for.
With those in place, a studio can be live with Romanian operators within weeks of its license appearing on the ONJN register.
What applies now (2026)
- Operator cost. A Class 1 online operator pays at least €1,280,000 a year in fixed charges: a €300,000 license fee, a 30% GGR authorization fee with a €480,000 minimum, and a €500,000 responsible-gambling contribution (Law 141/2025, from 1 August 2025), plus a €5,000,000 guarantee for casino games.
- Supplier cost. A Class 2 license for a slot studio or aggregator costs €10,500 once and €35,000 a year, with no GGR tax; see the Class 2 (B2B) license page.
- Player tax. Winnings are taxed at source: 4% up to RON 10,000, RON 400 plus 20% of the part between RON 10,000 and RON 66,750, and RON 11,750 plus 40% above that.
- Player protection. Only adults may play; a bill to raise the age to 21 was pending in the Chamber of Deputies in September 2026. Operators must honor the national self-exclusion database under ONJN Order 79/2025. See the ban on minors.
Conclusion
Slots are popular in Romania because the habit was already there and online play made it more varied and more convenient. The legal market has narrowed to a few dozen licensed operators fed by licensed studios, and the cost of entry at both levels is set by statute. For players, the 2022 rule still applies: never bet more than you can afford to lose. For studios and operators, check the license before the lobby.
Planning to supply or operate slots in Romania? Our gambling consulting services cover Class 2 game certification, source-code registration and the Class 1 route.