Recommended Ad Sizes
We recommend that publishers use standard IAB ad sizes, since most advertisers already have ads created at standard sizes.
Our most popular ad sizes with advertisers are 728×90, 300×250, and 125×125. If you’d like to create custom sizes, go for it! Any size can be selected when the ad zone is created in your BuySellAds account.
For even more flexibility and custom options, we recommend checking out Publisher Pro, which allows endless customization. You can learn more here.