Youtube Preview Ad Format Youtube Preview Ads should not be a stranger in today's society. Youtube is the second largest search engine in the world and it helps you to reach new customers and increase brand awareness. A video advert is a pre-roll advert that is shown to your customers before they start watching the video. Viewers can skip the video if it's not to their liking, which helps to protect the user experience. *Please contact us for a free consultation before booking.