Google announced on Google+ that they will now automatically convert eligible Flash ads to HTML5 format, this way the ad can be displayed on more devices.

Google said they are “introducing a way to automatically convert Flash ads to HTML5, giving advertisers better access to the portion of Google Display Network inventory that is HTML5-only.”

How do you know if your Flash ad is eligible? You can use Google’s Swiffy tool and if that tool converts your Flash ad then Google will auto-convert your Flash ads.

Google explains in their help center:

Forum discussion at Google+ & WebmasterWorld.