What Does Your Browser Reveal?

Why any of this matters

None of the values above required a permission prompt. Your browser publishes them to make pages render correctly — a site needs your screen size to lay out a page, and your language to pick a translation. The privacy problem is not any single value. It is the combination.

Screen resolution narrows you to a few percent of visitors. Add time zone and you are down to a fraction of a percent. Add installed fonts, graphics hardware and browser version, and the result is frequently unique — a fingerprint that follows you across sites with no cookie involved, and which clearing your history does nothing to reset.

What actually reduces your fingerprint

• Use a browser that resists it. Tor Browser makes every user look identical by design. Firefox and Brave ship meaningful protections by default.
• Leave the window at its default size. An unusual window size is a surprisingly strong identifier.
• Be sparing with extensions. Each one you add that changes the page is another distinguishing signal.
• Block third-party cookies. Every major browser now supports this, and it stops the simplest form of cross-site tracking.
• Treat a VPN as address protection only. It hides your IP address; it changes nothing above this line.

The counter-intuitive part: aggressive customisation can make you easier to track. A rare configuration stands out. Blending into a large crowd of default installations is the stronger play.

Do Not Track and Global Privacy Control

Do Not Track was a polite request that sites were free to ignore, and almost all of them did. It is effectively dead. Global Privacy Control is its successor and carries real legal weight in some jurisdictions, where it counts as a formal opt-out of the sale of personal data. Both are reported above.