What are the IAB standard ad sizes?

The IAB Universal Ad Package defines four core sizes: 300×250 (Medium Rectangle), 728×90 (Leaderboard), 160×600 (Wide Skyscraper), and 970×250 (Billboard). These are supported by virtually all publishers.

What is the most common display ad size?

The 300×250 Medium Rectangle is the most common display ad size, supported by virtually all publishers across desktop and mobile.

What ad sizes should I use for mobile?

For mobile campaigns, use 320×50 (Mobile Banner), 320×100 (Large Mobile Banner), 300×250 (Mobile Rectangle), and 320×480 (Interstitial).

Ad Size Guide — Complete IAB Standard Ad Sizes | AdWire

Ad Size Guide

Complete reference of IAB standard ad sizes across display, mobile, video, CTV, and native formats. Use this guide when building creatives or configuring ad inventory.

IAB Display11 formats

Name	Dimensions	Preview	Notes
Medium Rectangle	300 × 250	300×250	Most common display ad size
Leaderboard	728 × 90	728×90	Top of page, wide banner
Large Leaderboard	970 × 90	970×90	Wider version of leaderboard
Billboard	970 × 250	970×250	Large top-of-page ad
Half Page	300 × 600	300×600	Tall sidebar ad
Wide Skyscraper	160 × 600	160×600	Narrow sidebar
Skyscraper	120 × 600	120×600	Standard skyscraper
Large Rectangle	336 × 280	336×280	Larger medium rect
Square	250 × 250	250×250	Square format
Small Square	200 × 200	200×200	Compact square
Button	120 × 90	120×90	Small button ad

Mobile5 formats

Name	Dimensions	Preview	Notes
Mobile Banner	320 × 50	320×50	Standard mobile leaderboard
Mobile Large Banner	320 × 100	320×100	Larger mobile banner
Mobile Rectangle	300 × 250	300×250	Mobile medium rectangle
Interstitial	320 × 480	320×480	Full-screen mobile ad
Vertical Rectangle	240 × 400	240×400	Tall mobile ad

Video3 formats

Name	Dimensions	Preview	Notes
In-Stream Video (16:9)	640 × 360	640×360	Standard video ad aspect ratio
In-Stream Video (4:3)	640 × 480	640×480	Classic TV aspect ratio
In-Stream Video (Full HD)	1920 × 1080	1920×1080	Full HD video creative

CTV2 formats

Name	Dimensions	Preview	Notes
Connected TV (1080p)	1920 × 1080	1920×1080	CTV/OTT standard resolution
Connected TV (4K)	3840 × 2160	3840×2160	4K Ultra HD for CTV

Native1 formats

Name	Dimensions	Preview	Notes
Native (Fluid)	Fluid	fluid	Responsive native ad unit

IAB Standard Ad Sizes Explained

The Interactive Advertising Bureau (IAB) maintains standard ad unit sizes to ensure consistency across publishers and ad servers. The IAB's "Universal Ad Package" (UAP) defines four sizes supported by virtually all publishers:

300 × 250 (Medium Rectangle)
728 × 90 (Leaderboard)
160 × 600 (Wide Skyscraper)
970 × 250 (Billboard)

Choosing the Right Ad Size

For maximum reach across the programmatic ecosystem, build creatives in the four UAP sizes first. Mobile-first campaigns should include 320×50 and 300×250. Video and CTV campaigns use 16:9 aspect ratios at various resolutions.

Best Practices

Provide creatives in multiple sizes to maximize fill rates
Keep initial file size under 150KB for display, under 2.2MB for video
Use HTML5 creatives instead of static images for richer experiences
Test creatives across devices and viewports before launching

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