A tracking pixel is a snippet (JavaScript or image beacon) placed on a site or app that fires when a user takes an action, sending data to an ad platform for attribution and audience building. Pixels depend on browser storage — pair with Conversion API and consent mode for resilient measurement.
Platform naming: Meta Pixel, Google tag (gtag/GTM), LinkedIn Insight Tag, TikTok Pixel.
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Last verified Jun 5, 2026