I'm targeting an Adsense campaign on a series of specific websites. How can I check the available banner sizes they have? Up to now, what I used to do is to used my browser developer tools (F12), or screencap the page, open it in Photoshop and check the size. But sometimes the sizes I find don't match any standard format: for example, I'm seeing now a 632x60 banner, and another one with 300x90, which don't match anything in Google's Display Ads formats.
How to check available Adsense sizes in a website?
google;google adsense