How does tracking technology follow your trail around the web, even if you’ve taken protective measures?

Cover Your Tracks shows you how trackers see your browser. It provides you with an overview of your browser’s most unique and identifying characteristics.

Only anonymous data will be collected through this site.

Most web browsers leak your identity and your browsing history, but some browsers are more leaky than others.

The goal of PrivacyTests.org is to understand in detail: what data is each web browser leaking? Which web browsers offer the best privacy protections?

PrivacyTests.org is an open-source initiative that subjects popular web browsers to a suite of automated tests. These tests are designed to audit web browsers' privacy properties in an unbiased manner.

The results of the tests are made public to help users make an informed choice about which browser to use, and to encourage browser makers to fix leaks of private user data.