What Are Interstitial Ads? Best Practices for Publishers

An interstitial ad is a full-screen ad that appears at a natural pause point, like between two pages of a website, between levels in a game, or while navigating between screens in an app/web, rather than sitting alongside content the way a banner does. Because they take over the whole screen, interstitials are hard to miss, which makes them one of the highest-viewability formats available.   That same intensity cuts both ways: it's why interstitials perform so well, and why Google holds them to stricter rules than almost any other ad format.

How do interstitial ads actually work?

When a user hits a natural transition point, the app or site sends an ad request to the ad server or mediation platform. That request typically runs through a real-time auction, sometimes across multiple demand sources at once through header bidding, and the winning creative is rendered full-screen, usually preloaded in advance so it appears instantly rather than causing a visible delay. The "natural transition point" part matters more than it sounds. An interstitial shown mid-article or mid-task interrupts what the user is actively doing. One shown between articles, or between game levels, fits into a pause the user was already taking.

Google's rules for interstitial ads

This is the section most guides skip, and it's the one with the most direct impact on both revenue and search visibility. Google's Better Ads Standards specifically flag intrusive interstitials as an ad experience that can get a site's ads filtered in Chrome, or in more serious cases, penalized in search.

• Frequency capping -  Google recommends showing no more than one interstitial per hour, per subdomain, to a given user. Beyond that, it starts to count as an intrusive experience
• A visible close button -  Except for pure video interstitials, users need a clear, immediately visible way to exit. Hiding or delaying the close button is a common cause of policy violations
• No accidental click traps - The close button itself is usually rendered by the ad platform's SDK, Google's Ad Manager, Prebid, or the creative rather than something publishers design by hand. But Google still holds the publisher responsible for how it behaves on their site or app: a close button that's too small, too close to the ad's clickable area, or delayed to bait a mistaken tap gets treated as invalid activity, which is why it matters to choose demand partners and SDK configurations that handle this correctly, not just assume the default is compliant.
• Exemptions exist -  Non-advertising interstitials, like cookie consent banners or age verification prompts, aren't subject to these same restrictions, since they're not monetized placements

Publishers who ignore these rules don't just risk a worse user experience, they risk Google actively suppressing ad serving on the offending pages or app screens.

Best practices for placement and timing

• Trigger on natural breaks, not mid-content -  Between articles, between game levels, or between distinct app screens are all natural points. Halfway through a video or an article is not
• Preload the creative - Loading the ad in advance avoids the blank-screen delay that frustrates users during the transition. Unlike in-content ad units, interstitials are an out-of-page format, they overlay the screen rather than inserting into the page's normal layout, so they don't cause Cumulative Layout Shift (CLS) the way a late-loading in-content ad can. The real cost of a slow-loading interstitial is a jarring blank pause at the transition point, not a Core Web Vitals penalty.
• Space them out deliberately -  Even within Google's frequency cap, showing an interstitial every single time a user takes an action gets old fast, and retention drops faster than revenue rises
• Test placement by user segment -  First-time visitors, returning users, and highly engaged users often tolerate interstitials differently. A single fixed rule for everyone usually underperforms a tested one

Web interstitials vs. in-app interstitials: what's different

The core concept is the same, but the implementation and rules diverge:

	Web interstitials	In-app interstitials
Common triggers	Between page loads, on exit intent	Between game levels, after completing an action
Frequency guidance	Roughly one per hour, per subdomain	Set by the publisher, though similar restraint applies
Close requirement	Immediately visible, except video	Immediately visible, except video
Main risk	Chrome ad filtering under Better Ads Standards	App store policy violations and user churn

In-app interstitials tend to be integrated through an SDK from a mediation or header bidding partner, since there's no page "header" to place code in the way there is on the web.

How interstitials affect revenue

Interstitials generally carry a higher eCPM than standard banner formats, largely because full-screen placement drives strong viewability and engagement. But that revenue potential depends entirely on running them within the frequency and UX guidelines above. A setup that pushes interstitials too aggressively often sees short-term revenue gains followed by declining retention, which erodes long-term impression volume anyway. Running interstitials through a header bidding setup, so multiple demand sources compete for each interstitial impression rather than one fixed-price network filling it, tends to produce a more consistent eCPM than relying on a single source. We cover that setup in more detail in our guide on header bidding for publishers.  

FAQs

1. What are interstitial ads?

Full-screen ads shown at natural transition points, like between pages, articles, or app screens, rather than alongside content the way banners are.

2. How often can I show interstitial ads without violating Google's policies?

Google recommends no more than one interstitial per hour, per subdomain, per user. Showing them more frequently risks being flagged as an intrusive ad experience.

3. Do interstitial ads need a close button?

Yes, except for pure video interstitials. The close button needs to be immediately visible and easy to tap accurately, not delayed or placed too close to the ad's own clickable area.

4. Are interstitial ads better for revenue than banner ads?

They typically carry a higher eCPM due to strong viewability, but only when frequency and placement stay within guidelines. Overusing them tends to hurt retention, which reduces total impression volume over time.

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