IAB Standard Banner Ad Sizes: A Practical Guide for Modern Display Campaigns
Digital display advertising looks chaotic from the outside: hundreds of placements, different devices, and a maze of formats. Underneath that apparent chaos sits a surprisingly tidy backbone: IAB standard banner ad sizes.
Get these sizes right and campaigns run smoother. Media plans become easier to negotiate, creative production costs drop, and reporting stays consistent across publishers. Get them wrong and you face rejections, last‑minute redesigns, and underperforming placements.
This guide walks through the key IAB standard banner ad sizes, how they map to real inventory, and how to choose a focused set that works across web and mobile.
What the IAB Standard Banner Ad Sizes Actually Are
The Interactive Advertising Bureau (IAB) created a common language for display ads. Instead of every publisher inventing its own dimensions, the industry converged on a set of standard banner ad sizes measured in pixels.
These sizes matter for three reasons:
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Compatibility – Ad servers, SSPs, and DSPs expect specific width × height pairs.
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Scale – The most common IAB standard banner ad sizes give access to the most inventory.
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Efficiency – Designers can build a predictable set of masters instead of custom layouts for each site.
A practical example: a performance marketer running a retargeting campaign on Google Display & Video 360 and a direct buy with a news publisher. If the creative set includes the core IAB standard banner ad sizes, the same files can run on both channels with minimal friction.
The IAB has updated its recommendations over time. Older formats such as the 468×60 “full banner” still exist but no longer drive much volume. Modern campaigns focus on a more compact, high‑impact set of units.
Core IAB Standard Banner Ad Sizes for Desktop
Desktop display inventory still matters, especially for B2B, productivity, and long‑form content sites. The following IAB standard banner ad sizes cover most desktop impressions on major ad networks and direct publisher deals.
728×90 – Leaderboard
The 728×90 leaderboard is one of the most recognizable IAB standard banner ad sizes. It typically appears at the top of a page, just below the site header.
Where it shows up
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Homepage mastheads on news sites
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Forum header placements
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Top slots on blogs and editorial pages
Why it works
The width lets a brand stretch across the layout without overwhelming content. For example, a software company promoting a free trial can place a simple headline, product logo, and a single call‑to‑action button. The ad stays readable even on large monitors.
Practical tip
Use a clear hierarchy: logo on the left, concise value statement in the middle, and a high‑contrast button on the right. Avoid tiny legal text that becomes unreadable at scale.
300×250 – Medium Rectangle (MPU)
The 300×250 medium rectangle, often called an MPU, is a workhorse unit. It is one of the most requested IAB standard banner ad sizes across both desktop and mobile web.
Where it shows up
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Right‑rail placements on article pages
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Embedded within content blocks
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Below video players as companion banners
Why it works
The shape handles both image‑heavy and text‑heavy creatives. A streaming service, for instance, can feature key art, a short show description, and a watch‑now button without feeling cramped.
Practical tip
Design for both static and animated variants. Static JPGs are useful for strict publisher specs, while HTML5 versions allow subtle animation that draws attention without distracting from the page.
160×600 – Wide Skyscraper
The 160×600 wide skyscraper runs vertically along the side of a page. It remains a popular IAB standard banner ad size for desktop layouts with a persistent sidebar.
Where it shows up
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Right‑hand sidebars on news and finance sites
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Community platforms with long scroll threads
Why it works
The vertical format supports storytelling. A travel brand can use cascading visuals: destination photo at the top, offer details in the middle, and a booking prompt at the bottom. As users scroll, the ad stays in view longer than a horizontal unit.
Practical tip
Use vertical progression intentionally. Place the most important message near the top for quick scanners, then add supporting details further down for users who linger.
300×600 – Half Page
The 300×600 half page is one of the larger IAB standard banner ad sizes and commands high viewability.
Where it shows up
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Mid‑page right‑rail placements
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High‑impact units on editorial sites
Why it works
Publishers often price this format at a premium because it holds attention. For example, an automotive brand can feature a full vehicle image, key specs, and a financing teaser without crowding.
Practical tip
Avoid the temptation to fill every inch with text. Treat it like a mini landing page: strong hero image, short headline, and one clear next step.
970×250 – Billboard
The 970×250 billboard is a large, eye‑catching format used on many premium sites.
Where it shows up
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Top of homepages
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Section fronts for business, sports, or entertainment
Why it works
The billboard dominates the fold on many displays, making it ideal for brand campaigns. A consumer electronics launch can showcase product photography, a tagline, and a feature highlight in a layout that feels more like a hero banner than a traditional ad.
Practical tip
Use responsive layout within the creative. Keep the core message centered so it still looks balanced when cropped or partially obscured on narrower viewports.
Essential Mobile IAB Standard Banner Ad Sizes
Mobile traffic now represents a majority of page views for many publishers. The IAB standard banner ad sizes for mobile focus on smaller, more flexible formats that adapt to different screen widths.
320×50 – Mobile Leaderboard
The 320×50 mobile leaderboard is among the most widely supported IAB standard banner ad sizes on smartphones.
Where it shows up
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Top or bottom of mobile web pages
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In‑app banner placements
Why it works
It occupies a small slice of the screen, reducing disruption while still being visible. A food delivery app, for instance, can promote a discount code with a short headline and a clear install button.
Practical tip
Prioritize legibility. At this size, two short lines of copy are usually the upper limit. Focus on one benefit and one action.
320×100 – Large Mobile Banner
The 320×100 large mobile banner doubles the height of the standard mobile leaderboard.
Where it shows up
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High‑impact placements at the top of mobile pages
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Sticky units pinned to the bottom of the viewport
Why it works
The extra height allows stronger visuals and clearer calls to action. A financial services brand can include a logo, a promotional rate, and a simple value statement without sacrificing font size.
Practical tip
Use the vertical space to separate elements. Group logo and headline together, then place the button with comfortable padding. Crowded layouts feel spammy on small screens.
300×250 on Mobile
Although originally a desktop format, the 300×250 unit is now a core part of mobile inventory.
Where it shows up
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In‑feed positions between article paragraphs
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Below the main content as a post‑article unit
Why it works
On a phone, a 300×250 can fill most of the visible area, making it highly noticeable. An e‑commerce brand can feature a product carousel, price points, and a shop‑now button in a compact, scroll‑friendly block.
Practical tip
Design with touch in mind. Ensure tap targets are large enough and avoid placing key elements too close to the edges, where accidental touches often occur.
Less Common but Still Useful IAB Standard Banner Ad Sizes
Beyond the core formats, several additional IAB standard banner ad sizes appear frequently enough to justify inclusion in a broader creative set, especially for brand campaigns and direct publisher deals.
970×90 – Large Leaderboard
The 970×90 large leaderboard extends the classic 728×90 to better fit wide screens.
Example use
A cloud services provider running a thought‑leadership campaign on a technology news site can use this format for a prominent, yet not overwhelming, presence above the fold.
Tip
Reuse layout elements from the 728×90 but allow more breathing room around the headline and button.
468×60 – Full Banner
The 468×60 full banner is an older IAB standard banner ad size that still appears on legacy properties.
Example use
Long‑tail forums and niche communities sometimes reserve this size in header or footer placements. It can be useful for broad reach campaigns that accept lower‑impact inventory.
Tip
Treat it as a scaled‑down version of a leaderboard. Keep messaging extremely concise and avoid dense imagery.
250×250 – Square Pop‑Up / Square Banner
The 250×250 square occasionally appears in sidebars or as overlay units.
Example use
A casual gaming portal might use this size as a house ad promoting new titles, with room for a character visual and a play‑now prompt.
Tip
Center the composition. Squares can feel unbalanced if text and imagery lean heavily to one side.
How Many IAB Standard Banner Ad Sizes Do You Really Need?
Producing every possible format is rarely efficient. A lean, carefully chosen set of IAB standard banner ad sizes can cover the vast majority of impressions without overloading design and trafficking teams.
A practical starting bundle for most campaigns includes:
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300×250 (desktop and mobile workhorse)
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728×90 (desktop leaderboard)
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160×600 or 300×600 (one tall unit for desktop)
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320×50 (baseline mobile banner)
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320×100 (high‑impact mobile banner)
For a performance‑driven e‑commerce campaign, this compact set often delivers more than 90% of available inventory across major ad exchanges.
For brand campaigns with premium publishers, add:
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970×250 (billboard)
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970×90 (large leaderboard)
That extended set allows participation in custom sponsorships and homepage takeovers without bespoke dimensions.
When planning, match IAB standard banner ad sizes to channels:
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Programmatic display – Focus on 300×250, 728×90, 320×50, 320×100.
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Direct publisher buys – Add 300×600, 970×250, and any site‑specific high‑impact units.
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In‑app – Prioritize 320×50, 320×100, and 300×250.
A B2B SaaS marketer, for example, might run 300×250 and 728×90 on LinkedIn Audience Network, 300×600 and 970×250 on a tech news site, and 320×50 on mobile apps, all from one coordinated creative set.
Design Best Practices for IAB Standard Banner Ad Sizes
Knowing the dimensions is only half the equation. Effective use of IAB standard banner ad sizes depends on smart creative decisions that respect the constraints of each format.
Keep Copy Tight and Hierarchical
Each unit should communicate a single core message.
Example
A cybersecurity vendor promoting a free assessment in a 300×250 unit:
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Headline: “Uncover Hidden Security Gaps”
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Subline: “Free 30‑minute assessment”
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Button: “Book Now”
The hierarchy is obvious even at a quick glance.
Design for Readability First
Legibility often beats visual flair. On small IAB standard banner ad sizes like 320×50, decorative fonts and busy backgrounds quickly become a problem.
Practical rules
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Use high contrast between text and background.
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Keep body copy above 12–14 px on most units.
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Avoid more than two font families in a single creative.
A retail brand running a flash sale banner at 320×50, for instance, should favor a bold, plain font and a solid background over complex patterns.
Align Animation With Attention Spans
HTML5 animation can increase engagement, but only when used with intent.
Effective pattern
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Frame 1 (0–2 seconds): Brand and offer.
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Frame 2 (2–4 seconds): Key benefit.
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Frame 3 (4–6 seconds): Clear call to action.
A language learning app running 728×90 units can cycle through three short frames showing “Learn Faster”, “Daily 10‑minute lessons”, and “Start Free Trial” without overwhelming the viewer.
Plan for File Size and Load Time
Ad servers and exchanges enforce strict file‑size caps, often in the 150–300 KB range for HTML5 units.
Practical example
A publisher might reject a 300×600 creative that exceeds the limit, delaying the campaign. Compressing imagery, limiting the number of frames, and avoiding heavy script libraries keeps banners within spec.
Trafficking and QA: Making IAB Standard Banner Ad Sizes Work in the Real World
Even well‑designed creatives can fail if trafficking and quality assurance are rushed.
Map Sizes Correctly in the Ad Server
Each line item or ad group should be explicitly mapped to the IAB standard banner ad sizes it supports.
Example
In Google Ad Manager:
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Define ad units with allowed sizes (e.g., 300×250 and 300×600 for a right‑rail slot).
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Upload creatives tagged with those exact dimensions.
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Ensure responsive placements only accept matching sizes.
Misaligned mappings cause blank impressions or distorted ads.
Test on Real Devices and Browsers
Preview tools help, but they do not catch everything.
Practical workflow
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Load test pages on a 13‑inch laptop, a 24‑inch monitor, and at least two smartphone sizes.
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Check that 728×90 units render correctly at different zoom levels.
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Verify that 320×50 and 320×100 creatives do not overlap navigation bars or content.
A publisher‑direct campaign that passes this simple check avoids embarrassing layout issues that hurt both performance and brand perception.
Monitor Performance by Size
Different IAB standard banner ad sizes often behave very differently in terms of click‑through rate, viewability, and conversion.
Example
An online education provider might see:
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300×600: highest viewability, strong assisted conversions.
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300×250: strongest click‑through rate.
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320×50: large volume but lower engagement.
Armed with this data, budget can shift toward the units that drive results instead of treating all sizes as interchangeable.
FAQ: IAB Standard Banner Ad Sizes
What are the most important IAB standard banner ad sizes to start with?
For most campaigns, prioritize 300×250, 728×90, 160×600 or 300×600, 320×50, and 320×100. This set covers the majority of desktop and mobile inventory across major networks.
Are older formats like 468×60 still worth using?
The 468×60 full banner appears mostly on legacy or long‑tail sites. It can add incremental reach for broad campaigns but rarely delivers the impact of larger, more modern IAB standard banner ad sizes.
How many versions of each size should a campaign run?
A practical approach is to create 2–3 variants per size: one brand‑heavy version, one offer‑driven version, and one test concept. Rotate and optimize based on performance data rather than relying on a single static creative.
Do IAB standard banner ad sizes apply to social platforms?
Most social networks use their own aspect ratios and specifications. However, some placements, such as audience network inventory, accept standard IAB sizes like 300×250 and 320×50. Always check the platform’s current spec sheet.
How often do IAB standard banner ad sizes change?
Core dimensions change slowly. New formats appear over time, especially for rich media and high‑impact units, but the main IAB standard banner ad sizes—300×250, 728×90, 160×600, 300×600, 320×50, and 320×100—have remained stable for years.
Understanding and using IAB standard banner ad sizes effectively turns a messy ecosystem into a manageable framework. With a focused set of formats, disciplined design, and careful QA, display campaigns gain reach, consistency, and performance without unnecessary complexity.
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