When AdSense launched about a decade ago, people mostly accessed websites from their desktop or laptop computers. Fast forward today and all sorts of devices – mobile phones, gaming consoles, ebook readers and even televisions – are being used to connect to the Internet.
Web designers are therefore increasingly relying on a technique called Responsive Web Design where a single layout of the websites works across all devices, irrespective of the screen size or the resolution of the device.
Google AdSense ads are fixed-width but there’s a little workaround that can make your Google ads responsive. The idea is that if a visitor is reading your web page on a large desktop screen, they are served the large 728×60 or 336×280 units while if another visitor is viewing the same page on a smaller mobile screen, you can dynamically serve the 200×200 (or similar) ad unit.
Michel Wester of WebSonic.nl, an AdSense publisher from Netherlands, contacted the Google AdSense team for a confirmation and here’s the official response (in Dutch):
The rough Dutch to English translation is: