I'm running a blog about European Internet startups (in English). In the right sidebar I placed a small square (200x200) with image ads. Now, I'm planning to make the sidebar a little bit wider and place a square (250x250) there. I'm aware of the fact, that a medium rectangle (300x250) would be better - since it seems to be the more common format with more ad inventory (more competition / higher cpm). My problem: The medium rectangle would be too wide and doesn't fit to the overall-layout of the site.
Now my question: Is it worth it to change the small square to a square? I mean: Is there more ad invertory (+more competition) in the tech-space for the square then for the small square (or maybe less). Has anyone here already made some ​​experiences he/she could share?
Hi, When i made changes in adsense format in page, i tested for one week the change i wanted, in this way i had a better ideea about how it affects the traffic and revenue. Depends of the page layout, and also of website visitors.
I think it really does depend on the website and setup. I have some of those smaller squares set up in the right-hand navigation, and they perform well. On another site it performs badly (this is also taking into account any difference in traffic levels). Usually bigger is better, but not always. You have to ask yourself how much work is involved to change your site.