
In general, wider ad formats tend to outperform the taller ads. This is because the wider ads are much easier on the eye.
According to Google, the following ad formats result in the highest number of clíck-throughs:
- 336×280
- 300×250
- 160×600
Tim Carter of AskTheBuilder.com increased his revenues by 20 percent after placing the large rectangle (336×280) in the upper left corner, positioned within his articles.
Source:Cracking the Google Adsense Code By Kim Roach






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