Google Display Ad Sizes: Every Supported Dimension

Google supports 20 image ad sizes on the Display Network, but most campaigns only need a handful of them. The workhorses are 300x250 (inline rectangle), 336x280 (large rectangle), 728x90 (leaderboard), 300x600 (half-page), and 320x100 (large mobile banner). Every uploaded image ad must be a GIF, JPG, or PNG and must come in under 150KB. Animated GIFs are capped at 30 seconds and 5 frames per second. Below is the full verified list, the file rules, and the separate asset specs for responsive display ads.

The sizes that carry most campaigns

If you are building a display set from scratch and want coverage without producing all 20 dimensions, start here. These five cover desktop in-content, desktop sidebar, desktop top-of-page, and mobile in-app inventory between them, which is where the bulk of Display Network impressions live.

• 300x250 (inline rectangle): the single most widely accepted display size. Runs in-content on desktop and mobile.
• 336x280 (large rectangle): a bigger in-content unit, desktop-heavy.
• 728x90 (leaderboard): the standard desktop banner across the top of a page.
• 300x600 (half-page): a tall sidebar unit with a lot of creative real estate.
• 320x100 (large mobile banner): the mobile unit worth building, twice the height of a standard 320x50.

Add 160x600 and 320x50 if you want a wider net. Building all seven by hand is exactly the tedious part, which is why an ad resizer that recomposes one creative into every dimension in a single pass is worth more here than on any other network.

The full list of Google Display ad sizes

Every dimension Google accepts for uploaded image ads, grouped the way Google groups them.

Google groups these as squares and rectangles, skyscrapers, leaderboards, and mobile. The placement column above is practical guidance on where each unit tends to run, not a Google guarantee: publishers decide which sizes they accept on any given page.

File format and file size rules

These limits are strict and they reject ads, so check them before you upload.

• Accepted formats: GIF, JPG, and PNG.
• Maximum file size: 150KB per image ad. This is the rule that catches people out, because a photographic 970x250 billboard can blow past 150KB easily. Compress hard, and prefer flat color and clean type over busy photography at large dimensions.
• Animated GIFs: animation must be 30 seconds or shorter. Looping is allowed as long as the animation stops after 30 seconds. Animation must not exceed 5 frames per second.

The 150KB ceiling is a real design constraint, not a formality. Creative built with a strong single subject, high contrast, and large readable type compresses well and reads well at 320x50. Creative built as a photo collage will fail both tests.

Responsive display ads: a different spec entirely

Responsive display ads do not use the fixed sizes above. Instead you upload assets and Google assembles and resizes the ad to fit available inventory. The asset requirements are:

Note the file size gap: responsive display assets get 5120KB, while uploaded image ads get 150KB. They are separate systems with separate rules, and mixing them up is a common source of rejected uploads.

Those same 1200x1200 and 1200x628 files are also what a Search campaign image asset takes, with one catch that trips up display advertisers constantly: Search image assets forbid any digitally added text, logo, or graphic overlay, so a display banner cannot be reused there. The full Google Ads image size and image asset specs cover that split, along with the account eligibility conditions that hide the option entirely.

The text side of a responsive display ad:

• Short headlines: at least 1, up to 5, each 30 characters or fewer.
• Long headline: 90 characters or fewer.
• Descriptions: at least 1, up to 5. The editor enforces the length as you type.
• Business name: required, and it appears in the ad exactly as you enter it, so check the spelling and capitalization.

Writing five distinct short headlines and five distinct descriptions is the same discipline that makes search ads work. If you want the underlying logic, the rules in our guide to responsive search ads best practices transfer almost directly: variety beats repetition, and near-identical assets give the system nothing to optimize.

Should you upload image ads or use responsive display ads?

Use both, for different reasons. Responsive display ads give you the widest possible reach because Google can fit them into almost any slot, and they take far less production work. Uploaded image ads give you exact control over the composition at every size, which matters when brand precision is non-negotiable or when a specific layout is doing the selling.

The practical setup for most advertisers: run responsive display ads for coverage, and add uploaded image ads in the top five sizes where you want the design to be exactly what you designed. Producing both from the same creative direction is straightforward with a display ad maker that builds every dimension from one product input, and the same run can produce your search assets through the Google Ads generator.

What are the most common Google display ad sizes?

The most common Google display ad sizes are 300x250 (inline rectangle), 728x90 (leaderboard), 336x280 (large rectangle), 300x600 (half-page), and 160x600 (wide skyscraper) on desktop, plus 320x50 and 320x100 on mobile. These sizes have the broadest publisher support, which is why they are the standard starting set for a new display campaign.

What is the best size for a Google display ad?

If you build only one Google display ad, build 300x250. It is the inline rectangle, it is accepted by more publishers than any other unit, and it runs on both desktop and mobile. If you can build two, add 728x90 for desktop top-of-page. Three, add 320x100 for mobile. Coverage comes from the set, not from any single size.

What file size and format do Google display ads need?

Uploaded Google display image ads must be GIF, JPG, or PNG, and no larger than 150KB per file. Animated GIFs must run 30 seconds or less at no more than 5 frames per second, and any loop must stop by 30 seconds. Responsive display ad image and logo assets follow a different rule: up to 5120KB each.

How many display ad sizes should I make?

Make five to seven. The top five (300x250, 336x280, 728x90, 300x600, 320x100) cover the majority of the inventory most advertisers will ever see, and adding 160x600 and 320x50 rounds out desktop rail and mobile. Producing more than that yields diminishing returns unless you are buying premium placements directly.

GDN banner sizes and other names for the same specs

Google ad sizes go by several names, which makes searching for them confusing. "GDN sizes" and "GDN banner sizes" refer to the Google Display Network, which is the same inventory the sizes above cover, so a search for GDN ad specs and a search for Google display ad sizes return the identical dimension list. "Google ads banner size" and "Google ad image sizes" are the same thing again. Whatever the query, the five that carry most campaigns are 300x250, 336x280, 728x90, 300x600, and 320x100, and the full supported list is in the table above. There is no separate GDN spec to learn; it is one set of dimensions under a few different labels.

Google display ad sizes in cm and inches

Display ad sizes are defined in pixels, not physical units, so strictly there is no fixed centimetre equivalent: the same 300x250 ad is physically larger on a 24 inch monitor than on a phone. The conversion below uses the CSS reference standard of 96 pixels per inch, which is what browsers assume and what design tools default to when you set up a web document. It is the right number to use when a brief asks for display sizes in cm, or when you are laying artwork out in a print-oriented tool like InDesign or Illustrator and need the artboard to match.

Two warnings if you are working from the centimetre column. Do not build the artwork at those physical dimensions in a 300 DPI print document and export it: you will get a file roughly three times the pixel dimensions Google expects and, more to the point, far past the 150KB limit. Set the document to 96 PPI, or simply work in pixels and ignore the physical units entirely, which is what most display designers do. And if a brief asks for a mockup of three display sizes in cm, which is a common exercise on marketing courses, the leaderboard at 19.26 x 2.38 cm, the square at 6.61 x 6.61 cm and the mobile banner at 8.47 x 1.32 cm are the three the question is usually reaching for.

Design rules that survive the resize

The hard part of display is not the spec sheet, it is that the same idea has to work at 970x250 and at 320x50. A layout that breathes in a billboard becomes unreadable mush in a mobile banner. A few rules that hold across every size:

1. One message. A single headline, a single call to action. There is no room for a second idea at 320x50.
2. Type first. Set the headline at the smallest size, then scale up. If it reads in a mobile banner it will read anywhere.
3. Logo present, logo small. It has to be there; it does not have to dominate.
4. High contrast. Display ads sit inside other people\'s page designs, so your unit has to hold its edges.
5. Recompose, do not crop. A 300x600 is not a cropped 300x250. Each ratio needs its own arrangement of the same elements.

That last rule is where most manual display production dies. Recomposing one concept across seven dimensions, keeping the logo, the headline, and the product all legible in each, is genuinely slow work by hand. Generating on-brand AI ad creative for every dimension in one pass removes it.

Is 720x810 a standard ad size? How to check any dimension

No. If a dimension is not on the list above, the Google Display Network will not accept it as an uploaded image ad, and there is no tolerance or rounding. This trips up a lot of teams who receive assets from a designer or a brand agency built to whatever size the layout happened to need. The check is simple: match the exact pixel dimensions against the 20 supported sizes, and if there is no match, the asset has to be recomposed rather than scaled, because scaling a 720x810 file to 300x250 changes the aspect ratio and squashes everything in it.

A few near-misses come up often enough to name. 300x250 is supported but 250x300 is not, since orientation matters. 336x280 is supported and 336x250 is not. 970x250 and 970x90 are both fine, while 970x180 is not, though 930x180 is. That 930x180 unit, sometimes labeled a top banner, is a desktop placement rather than a mobile one, as are all three of the 970-wide leaderboards. The only sizes intended for phone screens are 300x50, 320x50, and 320x100.

If you are working from a set of assets in non-standard dimensions, the fastest path is to regenerate rather than crop. An ad resizer that recomposes the layout for each supported dimension keeps the logo and the headline legible, which manual cropping to a smaller box rarely does.

What are AdMob ad sizes, and are they the same as display ad sizes?

They are related but no longer the same question. AdMob serves the in-app inventory that a Display Network campaign can reach, and it used to be defined by a short list of fixed banner constants that mirrored the web sizes: 320x50, 320x100, 300x250, 468x60, and 728x90. Google has since moved its own guidance away from fixed sizes toward anchored adaptive banners, which are requested at the width of the device and sized by Google to suit it. Large anchored adaptive banners go further, allowing a taller unit of up to 20 percent of screen height, between 50 and 150 density-independent pixels.

What that means for you as an advertiser rather than an app publisher is straightforward. You do not build to an adaptive size, because the publisher's app requests it. You build the standard uploaded image sizes, and 300x250 plus 320x50 and 320x100 are the three that pick up most in-app inventory. Responsive display ads cover the rest, since Google generates the in-app layouts from your assets automatically.

Where display fits in the campaign

Display is a volume and retargeting channel, so it rewards two things: enough creative variety to avoid burnout, and landing pages worth sending the click to. The creative side is a production problem you can automate. The destination side is a content problem, and teams that pair display with a steady pipeline of landing pages and articles the campaign can point at tend to get more out of the same media budget, because the ad has somewhere specific and relevant to land.

Once the sizes are right and the pages exist, the remaining variable is creative iteration: producing enough distinct versions to find the one that works. If you want a broader view of the tools that do this, see our comparison of the best AI ad generator options and where each one actually fits.

Ready to produce every Display Network dimension from one product URL, correctly sized and under the file limits? Start with the display ad maker and get the full set in a single pass.