AdSense offers a variety of ad formats to make it easier for you to integrate them in your website's lay out. However, formats are not equally effective and some are known to be more CTR friendly than others.
According to our experiments, it seems that the Google AdSense team is right when they say that larger ad formats generate higher CTRs .
We especially advise you to use the following formats:
- 336*280
- 300*250
- 728*90
- 160*600
Needless to say that this rule is true as long as ads and content are harmoniously integrated as discussed next.