You can upload image ads with the following dimensions:
The size limit for an image ad is 150 kilobytes.
File type should be “.jpeg“, “.jpg“ or “.png“.
Supported formats:
...
Size (Px)
...
Name
...
300×250
...
Medium Rectangle
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300×600
...
Half Page
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970×250
...
Billboard
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336×280
...
Large Rectangle
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250×250
...
Square
Most popular dimension:
300×250 Medium Rectangle - About 40% of advertisers use this format.The article is now available here: https://n.rich/en/knowledge-base/image-display-ads-requirements