Understanding ACR: The hidden content tracking feature on smart TVs

ACR, which stands for Automatic Content Recognition, is a feature built into most smart TVs from major brands like Samsung, LG, Vizio, and Sony. It works by periodically capturing small snapshots of the video or audio playing on the screen and comparing them against a massive database. This process allows the TV to identify the exact show, movie, or advertisement being watched, regardless of whether the source is a streaming app, cable box, gaming console, or Blu-ray player.

Television manufacturers and third-party partners use this captured data for several purposes, primarily targeted advertising. Companies sell this viewing information to advertisers to deliver targeted ads directly on the TV or to track ad performance. Additionally, ACR is used to provide content recommendations based on viewing history across all inputs, and to help certain applications synchronize content with a user's mobile phone.

Because ACR essentially functions as a tracking and data collection tool, many users choose to disable it. Once enabled, the TV monitors all on-screen content—including media played through HDMI-connected devices like PCs or gaming consoles—and transmits that information back to the manufacturer or its partners. To turn off this tracking, users can locate the feature in their TV's Settings menu, where it is often listed under names such as "Viewing Information Services" (Samsung), "Live Plus" (LG), "Viewer Access Logging" or "Smart Interactivity" (Vizio), and ad personalization settings under "Google Assistant" (Sony/Google TV).