Ad Formats
Author: Alise Zaiceva 6 minute read
#Ad Types #Mobile Ad Optimization
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10 Best Mobile Ad Sizes and Ad Formats for 2024

Publishers often wonder which mobile ad sizes are the best for website monetization. This is especially important since we live in a mobile-driven world. 

According to the latest Statista data, there were 4.2 billion mobile internet users in 2021 and the number is expected to reach 5 billion by 2025.  

There are many different types of mobile ads, but how do you know which ones will work the best for your website?

We pulled a report from the total impressions from the Google Ad Manager server, AdSense, Ad Exchange, and yield group partners in our network to find out what were the 10 most requested mobile ad sizes and ad formats for publishers in 2024.

To help you choose the best-performing ad sizes, we’ve identified the 10 most popular mobile ad sizes and ad formats that you should be focusing on in 2024. 

300×250 Medium Rectangle

A 300×250 is the most popular mobile ad size in the advertising industry and Setupad clients. The 300×250 mobile ad has dimensions with a width of 300 pixels and a height of 250 pixels. 

The majority of advertisers design their ad creatives for this ad size. Therefore, publishers can access the largest pool of advertisers with this ad size. 

It performs best when placed between paragraphs of text or at the end of an article. It’s also a lightweight ad unit, which means it won’t impact your website’s loading speed.

300×250 Ad Example

Our experts find that the best-performing ad formats for 300×250 ad units are mobile banner ads and mobile interstitial ads. See both examples below.  

  • Mobile Banner Ad

Mobile banner ads are the most widely used ad type. Essentially, this rectangular ad unit that can be either static or animated (also known as an HTML5 ad). 

300x250 size
  • Mobile Interstitial 

Interstitial ads are full-screen ads that fill the entire screen of a mobile device. However, the size of the ad creatives can differ, for example, 300×250 or 300×600. 

From our experience, interstitial ads tend to generate high eCPMs and CTRs for publishers. Our recent case study showed that web interstitial ads increased the publisher’s ad revenue by 42%.

300x250 interstitial ad example

Related Article: What are Interstitial Ads and Should You Use Them?

336×280 Large Rectangle

A 336×280 is an ad size that has dimensions of 336 pixels wide by 280 pixels tall. Many sources claim that the IAB has delisted this ad size; however, major SSPs, like GoogleAdx, Magnite, and AdForm still use it, and it’s one of the most popular ad sizes in the industry.

This ad size is similar to a 300×250 medium rectangle. Hence, 336×280 also works best when placed between paragraphs of text or at the end of the article.

336×280 Ad Example

  • Mobile Banner Ad
336x280 banner ad example
  • Mobile Interstitial 
336x280 interstitial ad example

320×50 Mobile Leaderboard Ads

A 320×50 is an ad unit with dimensions of 320 pixels in width and 50 pixels in height. Mobile leaderboard, also known as mobile banner, is one of the most popular ad sizes for mobile. It’s designed to fit the width of the mobile screen (e.g., iPhone, Android, Google Pixel). 

320×50 Ad Example

The most popular 320×50 ad example is a mobile anchor ad, an overlay ad that remains in view as the user scrolls through the page. Therefore, this ad unit has a very high ad viewability rate. 

  • Mobile Anchor Ad
320x50 banner ad example

320×100 Large Mobile Leaderboard

A 320×100 large mobile banner ad has dimensions of 320 pixels in width and 100 pixels in height. A 320×100 is quite a small mobile ad size but is known as a large mobile leaderboard.

It is twice the height of the standard mobile leaderboard. Like its smaller counterpart, it has a great ad viewability rate and performs well across mobile devices.

large vs standard mobile leaderboard

320×100 Ad Example

  • Mobile Anchor Ad
320x100 banner ad example

336×336 Square 

A 336×336 ad size is 336 pixels wide and 336 pixels tall. This ad size is larger than regular rectangles and has become increasingly popular lately. 

336×336 Ad Example

  • Mobile Banner Ad
336x336 banner ad example

300×600 Double Rectangle 

A 300×600 ad is called a double rectangle because it covers most of the mobile screen. It has dimensions of 300 pixels in width by 600 pixels in height. It’s distinct from all other mobile ad sizes because of its tallness. 

This ad size isn’t as popular as the other ones in this list but it is one of the fastest-growing ad sizes by impressions.

It’s commonly called “half page” because it covers most of the mobile’s screen guarantees to draw users’ attention to the ad. 

300×600 Ad Example

  • Mobile Banner Ad
300x600 banner ad example
  • Mobile Interstitial 
300x600 interstitial ad example

360×300 Medium Rectangle

A 360×300 ad unit is 360 pixels wide and 300 pixels tall. For many publishers, this ad size delivers the best results and has even been dubbed the most popular ad size in Google AdX.

One possible reason why this size performs so well is that it’s not only popular on mobile but on desktop as well. Some advertisers don’t choose whether they want to be shown only on desktop/mobile/tablet. And yet, this ad size is popular on all devices.

360×300 Ad Example

  • Mobile Banner Ad
360x300 mobile ad size

360×120 Mobile Leaderboard

A 360×120 ad unit is 360 pixels wide and 120 pixels tall. This ad size is typically used for banner ads on mobile devices, often appearing at the top or bottom of the screen. Mobile Leaderboard is designed to be unobtrusive yet still visible enough to catch the viewer’s attention.

360×120 Ad Example

  • Mobile Banner Ad
360x120 mobile ad size

Bonus Sizes

320 x 480 Display Ads

A 320×480 ad unit is 320 pixels wide and 480 pixels tall. This ad size isn’t as popular as other standard banner sizes for mobile. However, it’s sometimes used for rich media ads, such as expandables and interstitials, mobile apps, and games. 

320×480 Ad Example

  • Mobile Expandable Ad

Expandable ads are rich media ads that expand when users click or hover on them. After some time, the ad will retract back. They’re popular in both mobile web and app environments. 

320x480 expandable ad example

320×180 Video Ads

320×180 video ad size is 320 pixels wide and 180 pixels tall. It has a 16:9 aspect ratio, which, alongside 4:3, is the most popular aspect ratio for video ads

This ad size is usually chosen automatically upon ad delivery on mobile devices. Advertisers can upload higher resolution video files, typically in the default formats like: 640×480, 640×360, or 1920×1080. 

Sophisticated ad platforms, like Google Ad Manager, then transcode these video files into smaller versions to fit different devices, apps, and video players in the best way possible. Therefore, for mobile devices, the actual video size is 320×180.  

320×180 Ad Example

  • Video Instream Ad 

Instream video ads are either pre-roll, mid-roll, or post-roll ad placements within the video. There has to be video content on your mobile site for this placement to work.

320x180 instream video example


It’s important to consider where to position your ad placements so they don’t cause accidental clicks or lead to a bad user experience. 

Our experts help publishers find the most well-performing ad sizes and ad formats for their websites and optimize them to reach maximum ad revenue. 

Sign up today and unlock your full monetization potential! 

About Alise Zaiceva
Alise is a content marketing manager at Setupad. She’s passionate about content and helping publishers scale their businesses through powerful digital marketing strategies. In her free time, she expands her knowledge of tech.

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