JPEG ads account for 42% of online banners in U.S.

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Reston, Va.—JPEG display ads are the most common online ads in the U.S., accounting for 42.4% of the impressions, according to the Ad Metric Creative Summary report released Tuesday by comScore. The report also found that leaderboard-style banner ads (728-by-90 pixels) were the most common size of online display ads.

“We’ve witnessed a strong resurgence in the display ad market over the past several months, with the number of impressions up 15% versus a year ago and average CPMs also continuing to rise,” Jeff Hackett, comScore senior VP, said in a statement. “One of the several drivers of strength in this market has been the innovation occurring with respect to ad units, as larger and more engaging creative ad formats are employed.”

The report also found that Flash and rich-media ads accounted for 40.3% of all display ads viewed.

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