By Alex Rivera · Last updated: October 2026
Quick answer: Casino banner ads perform best when you cover the standard IAB sizes that carry most inventory (300×250, 728×90, 320×50, 160×600 and the 300×1050 portrait), keep files light, and lead with one clear message: a game, a feature or an offer with its key terms visible. Every banner should carry an age mark and responsible gambling messaging, run only in licensed markets, and be tested against fresh variants every few weeks.
Banners are the oldest format in online advertising, and they still matter for casinos and crypto casinos. They give you visual control, broad reach on gambling-friendly sites and simple placement-level optimization. This guide covers the sizes worth producing, where banners run, how to design them, what compliance requires and where to buy the traffic.
Casino banner ads: the IAB sizes that matter
The Interactive Advertising Bureau (IAB) publishes the standard ad sizes most publishers and ad servers support. Its New Ad Portfolio fixed-size specification lists the units below, with recommended maximum file weights for the initial load and the subsequent load, measured after compression.
| Unit (IAB name) | Size (px) | Max initial / subload (KB) | Typical casino use |
|---|---|---|---|
| Medium Rectangle | 300×250 | 150 / 300 | In-content and sidebar; the most widely supported size |
| Leaderboard | 728×90 | 150 / 300 | Top of page on desktop; brand and offer lines |
| Smartphone Banner | 320×50 or 300×50 | 50 / 100 | Mobile sticky and in-feed; short message only |
| Skyscraper | 160×600 | 150 / 300 | Desktop sidebars; vertical game imagery |
| Portrait | 300×1050 | 250 / 500 | Premium tall placements on desktop |
| Billboard | 970×250 | 250 / 500 | High-impact top-of-page placements |
| Super Leaderboard / Pushdown | 970×90 | 200 / 400 | Wide desktop headers |
If budget limits you to a few sizes, start with 300×250, 728×90 and 320×50. They cover desktop and mobile on most networks. Add 160×600 and the larger units once you know which placements perform. Some networks also sell sizes outside this list, such as 300×600 half-page units, so check your network’s inventory list before you design.
The IAB spec also gives animation guidance: animations should stop when complete, should not run when the ad is out of view, and should keep CPU use at or below 30%. For slower connections such as 3G, the IAB suggests file weights 30% below the recommended limits. Light, efficient banners are good for users and help the ad load before the visitor scrolls away.
Where casino banners run
Banner placements vary in visibility and intent. Knowing them helps you size, design and bid sensibly.
- Above the fold: leaderboards and billboards at the top of a page. High visibility, usually higher prices.
- In-content: 300×250 units between paragraphs. Good engagement on review, news and sports content.
- Sidebars: skyscrapers and tall units on desktop. Visible for longer as users scroll.
- Mobile sticky: 320×50 units fixed to the screen edge. Strong viewability, very limited space.
- In-app: standard banner sizes inside apps where gambling ads are permitted.
On a gambling ad network, you can usually target by placement or zone and see performance per site. That is where the real optimization happens. Our overview of CliqBetter ad formats explains how banners compare with native, push and pop.
Creative best practices for casino banners
A banner has a second or two to land. The best casino creatives do one thing clearly.
- One message per banner. A game, a feature (fast withdrawals, live dealer, crypto deposits) or an offer. Not all three.
- Readable at small sizes. Test the 320×50 version on a real phone. If the headline is hard to read, cut words.
- Clear call to action. “Play now”, “See games” or “Join” in a button shape with strong contrast.
- Visible brand. Logo on every frame of an animated banner, so the brand registers even if the user looks away.
- Honest offers. Show the key terms where space allows and repeat them on the landing page.
- Consistent landing page. The page should match the banner’s message, game and visual style.
- Localize. Use the local language, currency and payment methods for each geo.
For more angles to test, see our ideas for high-converting gambling ad creatives.
Compliance: 18+, responsible gambling and licensing
Casino banners are small, but the rules still apply in full. Compliance also protects your accounts with networks and publishers.
- Age mark: include 18+ (or 21+ where local rules require it) on every banner.
- Responsible gambling messaging: add a short safer gambling line or the relevant local helpline where space allows, and always on the landing page.
- Licensed markets only: Google’s gambling and games policy requires a valid local licence for each targeted region and landing pages that show an age warning, responsible gambling information, terms and the licensee name and number. Other networks and regulators have similar expectations.
- Prominent terms: the UK Gambling Commission’s advertising guidance requires significant terms to be shown prominently near the headline offer, unless the ad is too small, in which case they must appear on the landing and sign-up pages.
- No appeal to minors: the same guidance says gambling ads must not appeal strongly to under-18s, for example through youth culture, and must not feature anyone who is or seems under 25 gambling or playing a significant role.
- Responsible placement: the Gambling Commission also requires that digital ads are not placed on sites offering unauthorised copyright content.
Testing casino banner ads
Testing is what separates a banner campaign that slowly gets cheaper from one that slowly gets more expensive.
- Test one variable at a time: headline, image, offer or CTA.
- Run tests per size. A winning 300×250 may not win at 320×50.
- Judge on cost per first deposit, not just CTR. A clickbait banner can raise clicks and lower deposits.
- Refresh creatives every few weeks, or as soon as CTR on a placement starts to slide.
- Track by placement so you can build whitelists of sites that deposit and blacklists of those that do not.
Our tips to improve conversion rates in iGaming ads go further on the landing page side.
Static, animated or HTML5?
Casino banners come in three common builds. Each has a place, and most campaigns benefit from testing at least two.
| Build | Pros | Cons | Good for |
|---|---|---|---|
| Static (JPG/PNG) | Light, fast, accepted everywhere | One frame to tell the story | Mobile sizes, simple offers, quick tests |
| Animated GIF | Several frames, broad support | Heavier files, limited colors | Showing a game, then the offer, then the CTA |
| HTML5 | Smooth animation, sharp text, dynamic content | Build time, file weight and CPU limits | Premium placements, live odds or jackpot feeds |
Whichever build you choose, keep the IAB weight and animation guidance in mind. An animated banner that ends on a frame without the logo or the CTA wastes the impression.
Pricing models for banner traffic
Banner traffic is usually sold on CPM, sometimes on CPC, and on some networks on CPA. CPM gives you the most control over placements and the most risk, because you pay whether or not anyone clicks. CPC shifts part of the risk to the network. CPA ties cost to an agreed action such as a first deposit, but typically needs reliable postback tracking and enough volume. Many advertisers test on CPM or CPC to find placements that deposit, then scale those. Whatever the model, compare sources on cost per first deposit rather than on the headline CPM or CPC rate, because a cheap impression that never converts is the most expensive kind. Keep campaigns split by geo and device so one market does not hide another.
Pre-launch checklist for casino banner campaigns
- Brand is licensed in every geo the campaign targets.
- Core sizes produced: 300×250, 728×90 and 320×50, plus any larger units your network sells.
- Each file is within IAB weight guidance and tested on a real phone.
- Every banner shows an age mark and, where space allows, a safer gambling message.
- Offer terms appear near the headline or, for small sizes, on the landing page.
- Landing page matches the banner and shows terms, age warning, RG links and licence details.
- Click IDs pass through to your tracker; registration and FTD postbacks are firing.
- At least two creative variants per size are ready for testing.
Where to buy casino banner traffic
Mainstream ad platforms restrict gambling ads, so many casinos and affiliates buy banners through networks that specialize in iGaming. When comparing them, ask:
- Does the network accept casino and crypto casino advertisers in my geos, and does it check licences?
- Which IAB sizes does it carry, and how much inventory is there per size and geo?
- Can I target by geo, device and placement, and see placement-level reports?
- Which pricing models are offered: CPM, CPC or CPA?
- Does it support S2S postbacks so I can optimize on first deposits?
- What creative and compliance review does it apply to ads?
For a shortlist, see our roundups of the best iGaming display ad networks and the best iGaming ad networks across all formats.
Mistakes to avoid
- Designing only for desktop. Much casino traffic is mobile; small sizes need their own design.
- Overloading the banner. Too much text, too many offers and too many frames cut clarity.
- Heavy files. Banners over the IAB weight guidance load slowly and may be rejected by publishers.
- Missing age marks or terms. This risks rejection, compliance action and lost trust.
- Never refreshing creatives. Fatigue raises costs even when nothing else changes.
- Running unlicensed geos. Always confirm the brand is licensed where the banner runs.
Advertise with CliqBetter
CliqBetter is an ad network built only for iGaming. Casinos, crypto casinos, sportsbooks and affiliates can buy display banners alongside native, push and pop traffic on CPM, CPC or CPA, with geo, device and placement targeting. Start self-serve, or talk to us about managed plans from $10,000 per month.
Frequently asked questions
Start with 300×250, 728×90 and 320×50, which cover most desktop and mobile inventory. Add 160×600 and larger units such as 970×250 or 300×1050 once you know which placements perform. All of these appear in the IAB’s fixed-size ad specification.
The IAB recommends a maximum initial load of 150 KB for 300×250 and 728×90 units and 50 KB for 320×50 smartphone banners, measured after compression. For slower connections, it suggests going 30% below those limits.
In practice, yes. Most regulators and ad networks expect an age mark and responsible gambling messaging, and some markets require 21+. Landing pages should also show age warnings, terms and licence details.
Not always. Animation can draw attention, but it adds file weight and can distract from the message. Test both, keep animations short, stop them when complete and keep the logo visible on every frame.
Mainstream platforms restrict gambling ads, so many advertisers use iGaming-focused ad networks. Choose one that accepts your geos, checks licences, offers placement targeting and supports postback tracking.