High-impact display is the trade's name for display advertising that is bigger, more interactive or more prominently placed than the standard rectangles and strips that fill most web pages. The category covers formats such as page skins, homepage takeovers, top scrollers, mid-page scrollers, interstitials, expandable units and full-width billboards. No standards body defines it. Adnami, a Danish vendor of such formats, describes high impact as "scalable, non-standard digital advertising" that uses rich media to stand out from banners. The category exists because standard banners are easy to ignore and cheap to buy, and publishers and brands want a product that commands the screen, earns measurable attention and justifies a higher price.

How the formats work

A standard display ad, such as a 300x250 medium rectangle or a 728x90 leaderboard, occupies a fixed slot. High-impact formats break that contract in one of three ways.

The first is size. Billboards such as the 970x250 unit, half-page 300x600 units and full-width units edge to edge on mobile take up far more of the viewport than a banner. The second is behaviour. A top scroller loads above the article as a full-screen canvas and scrolls away as the reader moves down. A mid-scroller, sometimes called an interscroller, opens a window in the article through which a fixed creative is visible as the text passes over it. Expandable units grow when tapped or clicked. Interstitials fill the screen between pages. The third is placement. A skin wraps the publisher's page in branded wallpaper on both sides of the content column, and a takeover gives one advertiser every major placement on a page, usually a homepage, for a set period.

Delivery is more complicated than for a banner. A banner can be served into any slot that accepts its size. A skin or a scroller needs code that manipulates the page itself, so it depends on a publisher integration, typically a tag or a template supplied by a specialist vendor such as Adnami, Kargo, Seedtag, YOC or GumGum.

On the programmatic side, most high-impact inventory moves through private marketplace deals rather than the open auction. The buyer receives a deal ID from the publisher or vendor, the demand-side platform (DSP) bids into that deal, and the vendor's rendering code builds the format around the winning creative. When Kargo's high-impact formats became available through Amazon DSP worldwide in September 2025, the integration required no extra setup from advertisers. The complexity stays with the seller.

Creative specifications follow from the formats. The IAB Tech Lab's New Ad Portfolio, published in July 2017, set initial and subload weight limits of 250 kilobytes and 500 kilobytes for the 4x1 billboard and the 2x1 half page, and up to 300 kilobytes and 600 kilobytes for the largest full-page units. Animation and auto-play video are capped at 15 seconds, and interstitials need a close button of at least 50x50 density-independent pixels from the moment they appear.

Measurement also bends. The Media Rating Council (MRC) counts a display impression as viewable when 50 per cent of its pixels are on screen for one continuous second. For units of 242,500 pixels or more, roughly a 970x250 billboard, sellers may apply a reduced 30 per cent threshold if they disclose it, as PPC Land's viewability explainer sets out. Large formats therefore reach viewable status more easily, which complicates comparisons.

Origins and evolution

The idea that bigger online ads perform better is nearly as old as the banner. On December 11, 2002, the Interactive Advertising Bureau (IAB) announced its Universal Ad Package, four sizes (160x600, 300x250, 180x150 and 728x90) that dropped the 468x60 banner, according to ClickZ. Greg Stuart, then IAB chief executive, said of the banner: "If it dies, we're not going to be crying for it." The IAB later dated that update to 2003, when the package was finalised.

The next push came in 2011. On February 28, 2011, the IAB named six Rising Stars display units: the Portrait (300x1050), the Slider, the Billboard derived from the YouTube masthead, the Filmstrip (a 300x3000 canvas viewed through a 300x600 window), the Pushdown and the Sidekick. Peter Minnium, who led the initiative, argued the industry would only reach brand budgets "if the creative community and the brands they represent are inspired by the canvas they are given." On February 26, 2012, the units entered the IAB Standard Ad Unit Portfolio, with the IAB citing research that users were 2.5 times more likely to interact with a Rising Stars unit than a standard one.

The 2017 New Ad Portfolio reversed course in part. It replaced fixed sizes with flexible aspect ratios, introduced the LEAN principles (Light, Encrypted, AdChoices supported and Non-invasive), and placed Rising Stars "in transition" towards delisting. It banned pop-ups, auto-expansion and scroll-over overlays but allowed user-initiated expansion and interstitials at content breaks. High-impact formats survived largely outside the formal standard, built and sold by vendors.

Regulation by browser came next. The Coalition for Better Ads, launched on September 15, 2016, published standards on March 22, 2017 that prohibited experiences such as pop-ups, prestitials with countdowns, large sticky ads and full-screen scrollover ads, with Chrome filtering non-compliant sites from February 15, 2018, as covered in PPC Land's Coalition for Better Ads explainer. Those rules drew the boundary between high-impact formats that the market accepts and intrusive ones that browsers will block.

Why it matters for marketers

The case for high-impact display rests on attention. In a May 2022 eye-tracking study across the UK and the Nordics, Adnami and Lumen Research reported that high-impact formats were viewed for roughly two to four times as long as most other units, according to ExchangeWire. Adnami's desktop Topscroll delivered 5,476 seconds of attention per 1,000 impressions, and skins delivered 2,181, about ten times a standard banner. A September 2025 YOC and Lumen comparison recorded 5,634 attention per mille (APM) for an interactive mobile format against 244 for standard mobile banners and 5,178 for a 15-second television spot, as PPC Land's attention per mille explainer records.

Those numbers support pricing. Publishers use attention data to argue that high-impact units deserve premium rates, and the International News Media Association reported in April 2022 that some publishers had sold high-impact ads at ten times programmatic rates.

The formats also travel across screens. Vendors increasingly package web formats with connected television (CTV) placements. Hearst News picked Magnite as preferred partner for high-impact web exit-intent and CTV pause formats in April 2026, and Google's YouTube Masthead, the origin of the IAB Billboard, became buyable through Instant Reserve in Display & Video 360 in December 2022.

Limitations and disputes

Most performance evidence comes from companies that sell the formats. Adnami has claimed high-impact ads perform "up to 45 times better" than standard display and ten times better on average, while its study with Lumen reported Topscroll results of up to 72 times standard display in some cases. None of these figures is audited. YOC's own documentation, updated in April 2026, calls APM "not a standardized KPI."

Comparisons are also uneven. A full-screen unit is compared with a 320x250 banner, yet the two differ in size, viewability threshold, price and frequency, so a multiple of attention seconds does not show a multiple of value. Lumen's own Amazon Ads work, reported by PPC Land in October 2026, found that about a quarter of the highest-attention campaigns produced no lift in purchase intent.

User experience is the persistent objection. The line between a high-impact scroller and a prohibited full-screen scrollover is thin, and the Coalition for Better Ads added two desktop and two mobile web experiences to its list on January 14, 2026. Heavy creative also costs page performance. Chrome began publishing ad count, ad density and ad weight metrics for publishers on September 15, 2026, and a single large unit can raise ad density without changing ad count.

Rich media describes creative technology, meaning ads with video, animation or interaction. A rich media ad can sit in a standard 300x250 slot, so it is not high-impact by placement, though most high-impact units use rich media.

IAB standard ad units are the fixed or flexible sizes the IAB publishes. High-impact display is defined against them, though some standard units, such as the 970x250 billboard and the 300x600 half page, are often sold as high-impact.

Takeover is one high-impact format, in which a single advertiser owns all major placements on a page or app for a fixed period. Every takeover is high-impact display, but not every high-impact ad is a takeover.

High-impact out-of-home uses the same phrase for a different medium. In outdoor and digital out-of-home (DOOH) advertising, "high impact" describes large, prominent sites such as city-centre spectaculars. When Open Media put 42 UK screens into VIOOH's programmatic platform in March 2026, its executives spoke of "high-impact spectacular sites." That sense concerns location and screen size, not web formats.

Recent developments

The term is moving beyond the web page. Kargo, which extended its formats to Amazon DSP in 2025, joined ChatGPT as an ad tech partner on May 5, 2026, though it had not said which formats run there. Google's Ad Manager added focused banner ads that blur article text beneath an inline banner in a March 9, 2026 beta, turning a standard slot into a pause in reading. AdSense expanded full-screen vignette triggers to six from February 2026. On the CTV side, the IAB Tech Lab finalised signals for six formats, including pause, overlay and squeezeback units, on July 22, 2026, which let buyers separate those placements in OpenRTB bid requests. Display has no equivalent signal yet, and as of October 2026 high-impact web units are still largely identified by deal ID rather than by a standard field.

Timeline

  • December 11, 2002 - IAB announces the Universal Ad Package of four larger sizes, finalised in 2003.
  • February 28, 2011 - IAB names six Rising Stars display units, including the Billboard, Portrait, Filmstrip and Pushdown.
  • October 4, 2011 - IAB publishes early Rising Stars engagement results at MIXX.
  • February 26, 2012 - Rising Stars units join the IAB Standard Ad Unit Portfolio, its first update since 2003.
  • September 15, 2016 - Coalition for Better Ads launches at Dmexco.
  • March 22, 2017 - First Better Ads Standards list prohibited desktop and mobile web experiences.
  • July 2017 - IAB Tech Lab publishes the New Ad Portfolio and LEAN principles; Rising Stars placed in transition.
  • February 15, 2018 - Chrome begins filtering ads on non-compliant sites in North America and Europe.
  • May 10, 2022 - Adnami and Lumen publish eye-tracking results comparing high-impact and standard display.
  • December 2022 - YouTube Masthead becomes buyable through Instant Reserve in Display & Video 360.
  • September 3, 2025 - Kargo high-impact formats go live globally on Amazon DSP.
  • January 14, 2026 - Coalition for Better Ads adds two desktop and two mobile web experiences.
  • March 9, 2026 - Google Ad Manager launches focused banner ads in beta.
  • April 21, 2026 - Hearst News names Magnite preferred partner for high-impact web and CTV formats.
  • July 22, 2026 - IAB Tech Lab finalises signals for six CTV ad formats.
  • September 15, 2026 - Chrome publishes experimental ad density and ad weight metrics in CrUX.

Summary

Who. Publishers and specialist vendors such as Adnami, Kargo, Seedtag, YOC and GumGum build and sell the formats. Brands and agencies buy them, usually through private marketplace deals, and attention firms such as Lumen measure them.

What. Display advertising that exceeds the standard banner in size, behaviour or placement, including skins, takeovers, scrollers, interstitials, billboards and expandable units, typically built with rich media.

When. Larger formats were championed from the IAB's 2002 Universal Ad Package and formalised in the 2011 Rising Stars units. Vendor-built formats dominated after the 2017 New Ad Portfolio, and attention data has driven the market since about 2022.

Where. Publisher websites and apps on desktop and mobile, increasingly packaged with CTV placements. The same phrase is used separately in out-of-home for prominent large-format sites.

Why. Standard banners attract little attention and low prices. High-impact formats aim to capture more of the screen and more seconds of attention, letting publishers charge more per ad, at the cost of user-experience risks and vendor-reported evidence.