Notice: There is no legacy documentation available for this item, so you are seeing the current documentation.
Notification Icon Image – If you are setting up the small image or notification icon the size for both Mobile and Desktop will be – 192px X 192px. It should be a square image and solid as well. This is how a notification icon looks like –
Large Image Notification for Desktop – The size for Desktop would be 360 px X 180 px. This feature only works above the chrome 52 version. This is how the notification with a large image looks like –
Large Image Notification for Mobile – The size for mobile is slightly different, it is 360px X 80px.
When you are setting up the account your logo size should be 256X256px.
This is available under Settings > Site Settings > Installation Settings > Update Site Logo