Privacy Badger is a browser extension that stops advertisers and other third-party trackers from secretly tracking where you go and what pages you look at on the web.

If an advertiser seems to be tracking you across multiple websites without your permission, Privacy Badger automatically blocks that advertiser from loading any more content in your browser. To the advertiser, it’s like you suddenly disappeared.

Privacy Badger differs from traditional ad-blocking extensions in two key ways. First, while most other blocking extensions prioritize blocking ads, Privacy Badger is purely a tracker-blocker.

The extension doesn’t block ads unless they happen to be tracking you; in fact, one of our goals is to incentivize advertisers to adopt better privacy practices. Second, most other blockers rely on a human-curated list of domains or URLs to block. Privacy Badger is an algorithmic tracker blocker – we define what “tracking” looks like, and then Privacy Badger blocks or restricts domains that it observes tracking in the wild. What is and isn’t considered a tracker is entirely based on how a specific domain acts, not on human judgment.