What is a pre-roll ad on CTV?

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Last updated: April 8, 2026

Quick Answer: A pre-roll ad on CTV (Connected TV) is a short video advertisement that plays before the main content on streaming platforms like Hulu, Roku, or smart TVs, typically lasting 15-30 seconds. These ads are targeted using data like viewing habits and demographics, with CTV ad spending projected to reach $29.24 billion in the U.S. by 2024. They differ from traditional TV ads by offering interactive features and precise measurement, and they first gained prominence around 2010 with the rise of streaming services.

Key Facts

Pre-roll ads on CTV usually last 15-30 seconds, with 15-second spots being the most common format.
U.S. CTV ad spending was estimated at $21.2 billion in 2022 and is forecast to grow to $29.24 billion by 2024.
Over 80% of U.S. households had a CTV device as of 2023, according to industry reports.
Pre-roll ads on CTV often include interactive elements like clickable overlays, introduced widely in the mid-2010s.
Targeting for CTV pre-roll ads uses data such as viewing history, device type, and location, with adoption accelerating post-2015.

Overview

A pre-roll ad on CTV is a video advertisement that appears before streaming content on internet-connected devices like smart TVs, streaming sticks (e.g., Roku, Amazon Fire TV), and gaming consoles. Emerging in the late 2000s with the growth of platforms like Hulu and Netflix, CTV pre-roll ads gained traction around 2010 as cord-cutting increased. By 2023, over 80% of U.S. households owned at least one CTV device, driving ad spend from $4.3 billion in 2018 to over $21 billion in 2022. Unlike traditional TV ads, CTV pre-rolls offer targeted, measurable campaigns, with formats evolving from simple videos to include interactive features post-2015. Key players include advertisers, ad tech companies like The Trade Desk, and streaming services such as Disney+ and Peacock.

How It Works

Pre-roll ads on CTV operate through a programmatic ecosystem: when a user selects content, an ad request is sent via an ad server to a supply-side platform (SSP), which auctions the ad slot in real-time. Demand-side platforms (DSPs) bid based on targeting criteria like demographics, viewing behavior, and location data. The winning ad, typically 15-30 seconds long, plays before the stream begins. Targeting leverages first-party data from streaming services and third-party data from ad tech firms, enabling precise audience segmentation. Measurement tools track metrics such as completion rates (often over 90%), viewability, and engagement via interactive overlays. Ads are delivered through video ad serving templates (VAST) and can be skipped or non-skipped, with most CTV platforms supporting both formats since the early 2020s.

Why It Matters

Pre-roll ads on CTV matter because they bridge the gap between traditional TV and digital advertising, offering high engagement in a growing medium. With CTV viewership surpassing linear TV in some demographics, these ads provide brands with scalable reach and better ROI through targeted campaigns. They drive significant revenue for streaming platforms, supporting ad-supported tiers like Hulu's or Paramount+'s. For consumers, they enable free or lower-cost content access, though ad frequency can impact user experience. In the broader ad industry, CTV pre-rolls are reshaping media buying, with projections suggesting they could account for over 20% of total video ad spend by 2025, highlighting their role in the shift toward data-driven advertising.