Banner Ad Sizes: Visual Guide to Standard Display Ads
Here are all the standard banner ad sizes in one place. Every size is shown to scale, so you can see how big it really is. Filter by device or shape, then click a size to see it at real size and read where it works best.
Best performing ad sizes
Google recommends five sizes as top performers, because they have the most advertiser demand. Start with these and add others only when your layout needs them.
| Size | Name | Best placement |
|---|---|---|
| 300×250 | Medium rectangle | In content, sidebar, mobile |
| 336×280 | Large rectangle | In content on desktop |
| 728×90 | Leaderboard | Header and above content |
| 300×600 | Half page | Sticky sidebar |
| 320×100 | Large mobile banner | Below header on mobile |
Desktop vs mobile ad sizes
On desktop you have room for wide and tall units, such as 970×250 billboards and 300×600 half pages. On mobile, however, the screen is usually 360 to 430 pixels wide. Therefore mobile layouts rely on 300×250 in content and 320×50 or 320×100 anchor ads. Read more in top banner ad sizes for mobile devices.
Tips for choosing ad sizes
- Use multi-size slots. Let 300×250 and 336×280 compete in the same place, and 728×90 with 970×90.
- Reserve the space. Give each slot a fixed min-height so the page does not jump when the ad loads. This protects your Core Web Vitals.
- Think about viewability. A smaller ad that is seen earns more than a big ad at the bottom of the page.
- Design your own creatives. Make banners in any size with our free online banner maker.
- Measure the result. Compare sizes by eCPM with the CPM calculator.
Frequently asked questions
What is the most common banner ad size?
300×250, the medium rectangle. It works on desktop and mobile, fits in content and sidebars, and almost every advertiser has creatives for it.
Which ad sizes earn the most?
Google lists 300×250, 336×280, 728×90, 300×600 and 320×100 as top performers. Large units like 300×600 and 970×250 often have high CPMs because they are very visible.
What is the best ad size for mobile?
300×250 inside content and 320×100 or 320×50 as a banner or sticky anchor ad. Avoid units wider than the screen.
What size is a leaderboard ad?
A standard leaderboard is 728×90 pixels. The large leaderboard is 970×90 and the mobile leaderboard is 320×50.
Should I use multi-size ad slots?
Yes. Allowing several sizes in one slot, for example 300×250 and 336×280, lets more advertisers compete. As a result fill rate and CPM usually go up.