The YouTube homepage masthead is a 970x250 pixel in-page creative that runs the full width of the YouTube homepage below the navigation bar for 24 hours.
There are two masthead ad formats:
- Standard: Loads as a 970x250 pixel ad unit. For more information, see Homepage masthead unit.
- Expandable: Loads as a 970x250 pixel ad unit, and expands to 970x500 when a user clicks on it. For more information, see Homepage expandable masthead unit .
This guide explains everything you need to know about the process of launching a YouTube masthead.