Display Banners

What it is

The classic IAB-sized display unit — 300x250, 728x90, 160x600, 320x50, 468x60 — with mobile and desktop variants and always-on advertiser demand from Tier-1 and Tier-2 brands. The format the rest of the industry got built on top of, and the one most likely to be written off prematurely.

The comparative framing

Banner is the unit comparison reviews are most condescending toward, usually for reasons that do not survive contact with the math. Three matchups worth running.

• Banner vs native. Native wins on engagement per impression by a wide margin; banner wins on inventory breadth and always-on demand. In Q2 2024 parallel-buy testing across a Tier-1 EU campaign, native delivered roughly 3.5x banner CTR but on a 60 percent smaller addressable inventory pool. For a brand with strict reach floors and matched-pacing constraints, banner is still the unit that hits the reach number.
• Banner vs in-page push. Banner is the always-on background; in-page push is the consideration interruption. The advertiser who needs both is the advertiser who has split their funnel correctly. Treating them as substitutes is the methodology error.
• Banner vs interstitial. Interstitial gives full-screen impact at a frequency cap; banner gives partial-screen presence at no cap. For retargeting and brand-awareness, banner is structurally correct. For app-install and high-impact moments, interstitial.

Where banner is the wrong call

• Single-format performance campaigns with tight CPA goals and no other touchpoint. Banner is most powerful as part of a mixed unit plan, less powerful as the only unit.
• Verticals where consideration-stage creative is required and 300x250 does not give the canvas. Finance offers above £10K AOV are an example; banner is a touchpoint, not the conversion unit.
• Mobile-first publishers in markets where in-page push has already won the equivalent inventory. Several major Tier-2 LATAM publishers I have benchmarked moved their inventory mix toward in-page push between 2023 and 2025, and banner CPMs have softened in step.

Specs

• Pricing models: CPM and CPC. CPM is the format’s native pricing; CPC works when the advertiser has a clean attribution path and discount on auction friction.
• Devices: Mobile and desktop, with mobile inventory carrying the majority of the addressable pool in 2025.
• Geo coverage: 240+ countries claimed. The format is the closest thing to true global parity in display, because the unit is standardised at the IAB layer.
• Anti-fraud: Multi-layer filtering and ML scoring on every impression. Banner is the format where viewability measurement (IAS, DoubleVerify, Moat) has had the longest to mature; the data is more reliable than for newer formats.

Methodology in the appendix.