As of February 1, 2016, the method for calculating the HTML5 ad size follows the preliminary guidance of the IAB for ads with and without additional assets.
Calculating Size for Ads with Workspaces Only
The size of an HTML5 ad equals the total size of all assets in the ad’s compressed Workspace. Compression is automatically applied, reducing the size of each asset type to the compressed size.
Calculating Size for Ads with a Workspace and Additional Assets
Ads that contain additional assets are calculated exactly as ads with Workspaces only; however, there is one exception. If the ad has an additional asset that is larger than the largest video in the Workspace, that asset is included in the calculation instead of the largest video.
The following table describes how ad size is calculated according to the different ad types.
|Ad Type||Ad Size Calculation|
|Regular ads with no videos||The ad size is the size of the Workspace and the largest Additional Asset (if one exists).|
|Rich Media ads with a video||All the ad’s non-video assets, plus the largest video in the Workspace. If there are additional assets, and one of them is larger than the largest Workspace video, it will replace that video in the calculation.|
|Dynamic Creative ads||The ad size will be the sum of the ad's non-video assets, plus the largest video in the Workspace.|
- Ads that were created before February 1, 2016 are counted according to the old calculation method, whether or not they are attached to a campaign.
- When ads that were created before February 1, 2016 are copied to create new master ads, the resulting master ads are counted according to the old calculation method.