Best Mobile Ad Sizes and Formate for 2026
Which mobile ad sizes should you focus on to maximize the impact and reach of your next mobile advertising campaign? Mobile advertising offers a variety of formats — including video, banner, interstitial, native, and rich media. This guide lists the main Google Display banner dimensions for desktop, mobile and responsive placements.
Around 56% of global internet traffic will originate from mobile devices. Mobile ads come in many different shapes and sizes, but did you know that some perform better than others. We analyzed total impressions from Google Ad Manager, AdSense, Ad Exchange, and our yield group partners across various mobile ad units.
Best Mobile Ad Sizes and Formats
This comprehensive data helped us identify the top-performing mobile ad types for publishers. To help you choose the best-performing ad sizes, we’ve identified the 10 most popular mobile ad sizes and ad formats to use in 2026 to boost your revenue.
300 x 250 pixels
This is one of the most popular mobile ad sizes. The rectangular unit is also called the HTML5 ad. The 300×250 mobile ad has dimensions with a width of 300 pixels and a height of 250 pixels. Medium rectangles allow advertisers to enhance their ad campaigns.
336*280
This ad type is similar to the 300*250 rectangle size with little difference. This ad size is similar to a 300×250 medium rectangle. The similarities between both mobile ad sizes make them popular among advertisers.
320×50 Mobile Leaderboard Ads
A 320×50 ad is a standard mobile display ad size and one of the most common mobile banner. This ad size helps to reduce the possibility of intrusive advertising. Therefore, this ad unit has a very high ad viewability rate.
728*90
The 728×90 Standard Leaderboard is a prominent horizontal ad format often placed at the top of web pages. Most of the news website and blogger use this Mobile Ad Sizes banner in website header. The 728 x 90 Leaderboard is a banner ad format that’s probably more commonly displayed on desktop.
336×336 Square
The 336×336 Square Format is a versatile ad size that fits seamlessly within content. These larger ads perform well in content-rich environments, where users are likely to engage with larger ad units.
Google lists 320 x 100 large mobile banners as one of the top five most deployed mobile ad sizes. This ad size is usually chosen automatically upon ad delivery on mobile devices. This ad size is typically appearing at the top or bottom of the screen.
- Affordable: Low-cost creation and running
- Wide reach: Visible on many websites
- Targeting: Customizable for audiences
- Trackable: Clear performance data
- Fast setup: Quick to design
- Brand boost: Improves visibility
- Flexible sizes: Fits all placements
- Retargeting: Re-engages past visitors
- Ignored: Often overlooked
- Low engagement: Fewer clicks
- Crowded: Competes with other ads
- Annoying: Overuse frustrates users
- Limited info: Conveys little detail
- Blocked: Stopped by ad blockers
- Small sizes: Limits creativity
- Overexposure: Causes banner fatigue
Why Mobile Ad Sizes Matter
Finding the appropriate ad size is not just a design choice; it is also a monetization choice. Mobile screens can differ significantly from one device to another, and responsive design. It is also important to consider industry standards.
Consolidated Table of Suitable Mobile Ad Formats and Sizes
| Mobile ad formats | Mobile ad Sizes |
| Mobile banner ads | 300*250, 320*50, 320*100, 300*50, 300*100 |
| Mobile interstitial ads | 320*480, 480*320, 300*400, 300*250, 320*50, 300*50 |
| Mobile video ads | 320*480 320*180 (instream video ads) 480*320 300*250 (outstream video ads) |
| Mobile native ads | 320*480 |
| Rich media ads | 320*480 (expandable ads) |
A few years ago, mobile banner ads were only displayed in banner format. With the majority of internet traffic now coming from mobile devices. Today, there are multiple display formats. Our experts help publishers find the most well-performing ad sizes and ad formats for their websites.
FAQs
What are the trends in mobile ad formats?
Mobile ad formats are shifting toward short-form video, interactive and shoppable units, privacy-safe contextual targeting.
Do Mobile Banner Ads Increase Sales?
Yes, a change of about 2% can be achieved when working with mobile banner ads.
Does ad size influence CPM and viewability?
Yes. Larger and more engaging formats like video ads or rich media units generally yield higher CPMs due to better viewability.
What is the most common mobile ad size?
The 320×50 mobile leaderboard remains the most widely used mobile ad size.
What is the best Google Display ad size?
For better reach, don’t rely on one size. Build a core set of banners, including 300 x 250, 336 x 280, 728 x 90, 300 x 600 and 320 x 100.
