Explainer1 min readUpdated July 2, 2026
What your browser reveals about you
Short answer
Every site you visit can read details your browser shares automatically: user agent, screen and window size, language, timezone, and hardware hints. Combined, these form a fingerprint that can identify you even without cookies.
More than your IP address
Websites do not need cookies to learn about you. Your browser hands over technical details on every request and via JavaScript — and together they are surprisingly identifying. Seeing exactly what is exposed is the first step to understanding your privacy.
What is visible
- User agent — browser, version, and operating system
- Screen and window size, and pixel density
- Language and timezone
- Installed fonts and available hardware hints (cores, memory)
- Graphics capabilities and supported media formats
- Whether you have Do Not Track or reduced-motion set
Try it: Your Device, ExactlySee exactly what your browser exposes — read locally, never sent anywhere.Open tool
This is browser fingerprintingIndividually these details are harmless, but combined they form a fingerprint that is often unique enough to track you across sites without any cookies. That is why the list matters more than any single item.
How to reduce your exposure
- Use a mainstream browser and configuration so you blend in with the crowd
- Keep your browser updated; anti-fingerprinting defenses improve over time
- Consider privacy-focused browsers or extensions that resist fingerprinting
- Clean tracking parameters from links you share — see how to clean tracking parameters