Banner Sizes: 2021's Most Effective Banners

Last updated on June 2nd, 2021

One of the most important things to consider when creating banners for Display Advertising is which sizes to use. The banner size can have a major effect on how ads perform – and the right choice can in fact boost your ad effectiveness.

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To help you out we’ve collected data from 4.8 billion ad impressions on millions of sites to bring you the most up to date statistics on banner usage for 2020.

If you want to know which banners are the most commonly used across the web, this guide is for you.

The top Banner Sizes sorted by how frequently they’re used

Common Web Banner Sizes

The Interactive Advertising Bureau (IAB) has created standardized guidelines on banner sizes, which work across all advertising networks, including the Google Display Network (GDN).

If you want to learn more about the different sizes and how common they are, you will find the 15 most important formats in a handy chart below – together with how common they are, to make it easier for you to plan your campaign.

You will also find a specific section for mobile ads below the first table.

Standard Banner Sizes

Size (Px)NameGlobal FrequencyWeightExample
300×250Medium Rectangle40%
160×600Wide Skyscraper12%
300×600Half Page5%
336×280Large Rectangle
234×60Half Banner
120×240Vertical Banner
970×90Large Leaderboard
200×200Small Square
180×150Small Rectangle

Mobile Banner Sizes

Size (Px)NameGlobal FrequencyWeightExample
320×50Mobile Leaderboard12%
320×320Mobile Full Page Flex1%
320×100Large Mobile Banner
200×200Small Square

As you can tell from this list there’s quite a few sizes to choose from when picking your ads – but the good news is that the absolute majority of impressions are made up of only 4 sizes! Read on to learn more about which banners to focus on in your display advertising.

Which ad sizes are the most popular?

Our research shows thatthe different banner sizes are very unevenly distributed in their usage, with 4 variations dominating the digital advertising world.

89% of all ad impressions are made up of these 4 sizes:

300×250 Medium Rectangle 40%728×90 Leaderboard 25%320×50 Mobile Leaderboard 12%160×600 Wide Skyscraper; 12%

Mapped out the distribution of global ad inventory looks like this:

Global Banner Inventory Distribution

When planning your display campaigns it could be wise to focus on these four sizes.

Mobile Banner statistics

If you haven’t already shifted your advertising efforts to a mobile-first focus it’s definitely a good time to start thinking about it.

Mobile has passed desktop as the main device used for browsing, delivering 63% of all internet traffic in 2017.

Mobile ads can be displayed both when you’re browsing the web but also directly in apps.

Of the different ad sizes available for mobile, one format clearly stands out among the rest; the 320×50 Mobile Leaderboard.

Read on to learn more about this format.

Mobile Leaderboard (320×50)

The 320×50 banner is by far the most widely used ad for mobile, both in browsers and in apps. In fact, our research shows that:

12% of all global ad inventory is made up of the Mobile Leaderboard.

If you want to maximize your ad reach in 2018 I highly recommend having a few of these formats in your inventory.

What does a 320×50 Mobile Leaderboard look like?

Displayed at the bottom of apps and embedded in content it looks like this:

Mobile Leaderboard

This format is heavily used within apps, often displayed as a banner at the very bottom of the screen.

Here’s an example of in-app usage of the Mobile Leaderboard:

In-app Mobile Leaderboard

Apps are quickly becoming one of the most common ways people consume content, and if you want to be able to reach potential customers while they’re browsing apps, this is the main format to use.

Another format that works well on both mobile and desktop is the 300×250 Medium Rectangle. This is the most widely used banner size of all global inventory, with 40% of total reach.

Want to know more about this type of ad? Keep reading!

Medium Rectangle Ad (300×250)

No Display Ad campaign is complete without the Medium Rectangle. This standard banner has 40% of global inventory and is by far the most important inventory in your advertising arsenal.

The reason it’s so popular is that it works well on both mobile and desktop.

What does the 300×250 Medium Rectangle Ad look like?

On a desktop setting the Medium Rectangle looks like this:

300×250 Medium Rectangle Ad
Where is the Medium Rectangle used?

This banner is often embedded in content like text articles. It’s usually perceived as less intrusive than bigger formats.

The Medium Rectangle performs well both as a text version or an image ad.

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Here’s an example of an in-content ad that follows the GDN guidelines:

300×250 in-app Medium Rectangle Banner

On mobile devices this format acts as a page-break for long pieces of content and if it’s well designed it creates a natural addition to websites that users don’t see as intrusive.

Implementations and best practices of the Medium Rectangle Banner

Because of the unique size and shape of the Medium Rectangle Ad – and it’s widely spread usage, Google has issued specific guidelines for this type of banner.

It’s important to note that if you fail to follow the rules set up by Google they may decide to remove your ad from the Google Display Network, which covers around 2 million websites and reaches up to 90% of all internet users.

If you want to read the full set of guidelines you can find them under the Google AdMob guidance on the Medium Rectangle Ad.

Simplified, the ad guidance for the 300×250 banner dimension look like this

300×250 GDN Policy

Ad mimicking app contentAds must be clearly distinguishable from app content Ad overlapping with app contentThe ads cannot cover the content of the app Ad on screens with no contentDon’t place ads on “dead-end”-screens, meaning there must be a way to exit out of the screen without clicking the ad. Ad adjacent to interactive elementsAvoid accidental clicks on the banner by not placing it in too close proximity to other interactive parts of an app, like a navigational menu or a chat box. Custom close or dismiss buttons Close buttons should not overlap or be adjacent to the ad, since this causes a lot of accidental clicks

As a rule of thumb ads should be easily distinguishable from the general app content. If users understand that they’re looking at an ad, you should be in the clear.

The 300×250 banner should definitely be part of your banner inventory – as it works very well on both desktop and mobile, and covers a huge part of global inventory.

The next banner on the list is the 728×90 Leaderboard. With 14% of global inventory this is an important ad to use in your campaigns. Keep reading if you’re interested in learning more about this banner size.

Leaderboard Banner (728×90)

Also known as a Horizontal Banner, this is the 2nd most common ad size among global inventory, with 25% of global impressions. This banner combined with the Medium Rectangle and the Mobile Leaderboard should cover most of your Display Advertising needs.

The 728×90 Leaderboard is part of the IAB standard banner sizes, and works well on the Google Display Network.

What does a 728×90 banner look like?

On a desktop browser the ad is displayed like this:

728×90 Leaderboard Banner
Where is the Leaderboard Banner used?

The horizontal banner is usually displayed at the very top of websites – but sometimes also shows up at the bottom.

“Above the fold” ads tend to deliver better than banners at the bottom of a page – simply because fewer users scroll all the way to the bottom of a website, and when they get there they may feel like they are already done with the content and are less likely to click on to something else.

Example of a Leaderboard ad

Below is an example of a well designed Leaderboard Banner:

Flygbussarna Leaderboard Banner

The last types of ads we’ll take a closer look at are the Wide Skyscraper, and the Skyscraper formats. These are not mobile friendly, and their reach is in decline, but are still widely used for desktop browsing.

Wide Skyscraper (160×600)

Sometimes called a Standing Banner, this is the more common of the two Skyscraper banners with 12% of global inventory.

There is a thinner version of this ad, simply called Skyscraper, with the size 120×600 that is aimed at websites that cannot accommodate the Wide Skyscraper, but when choosing between the two, the Wide Skyscraper is your safest bet.

More sites use this banner size than the thinner Skyscraper and it’s placed along the sidebar of a website. About 12% of global ad inventory is made up of the Wide Skyscraper whereas only 0.2% consists of the thinner Skyscraper.

What does a 160×600 banner look like?

The Wide Skyscraper looks like this:

Wide Skyscraper Banner
Where is the Wide Skyscraper used?

The Wide Skyscraper is usually used along sidebars on websites and converts well both as text ads and image ads.

Example of a Wide Skyscraper ad
A Wide Skyscraper Banner from Marshall on Buzzfeed

Buzzfeed’s entire business is ad-based and they have perfected the use of display ads in strategic locations. You can find a Wide Skyscraper on the right side of their main page.

As mobile has overtaken desktop as the main device for browsing the Skyscraper is becoming less and less relevant. I still recommend having one in your inventory for desktop and tablet devices, but if you have limited resources for creating banners your focus could be better spent on other formats.


Display advertising is very much alive and well in 2018, and to create a successful campaign you don’t need a huge stable of inventory.

You can successfully cover both your desktop and mobile reach by starting with with 4 varieties of ads, and expand as you start seeing results.

If you focus on these 4 dimensions you’ll cover over 89% of global inventory:

300×250 – Medium Rectangle Ad320×50 – Mobile Leaderboard728×90 – Leaderboard Banner160×600 – Wide Skyscraper

It’s important to keep mobile in mind when creating your Display Campaign. The majority of internet traffic nowadays comes from mobile and ads should be created to accommodate this.

The 300×50 Mobile Leaderboard displays well both in apps and in web browsing on mobile, and the Medium Rectangle works on both mobile and desktop.

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There are specific guidelines for the Medium Rectangle ad and it’s important to keep these in mind when creating ads for the Google Display Network. The guidelines can be found here.

Now that you know a bit more about banner sizes, it’s time to get creative! The next guide will show you have to get started with our 5 steps to creating the perfect banner. Don’t miss out!

Do you know anyone that could use some help with creating banners? Share this article and maybe you’ll get a cookie!

Do you want to learn more about programmatic advertising? Have a look at our ultimate guide: What is programmatic advertising?