Best Free Tools to See What Your Browser Reveals About You
Every website receives information from your browser. Some of it is basic. Some of it can contribute to fingerprinting.
A browser privacy checker shows what your browser exposes right now.
What websites can see
Depending on the page and browser settings, sites may see:
- IP address
- user agent
- screen size
- language
- timezone
- WebGL details
- canvas signals
- fonts
- permissions
- device type
- referrer data
None of this means every site is doing something harmful. It means your browser is not invisible.
Cookies vs fingerprinting
Cookies store data in the browser. Fingerprinting uses combinations of browser and device signals to recognize patterns.
Blocking cookies helps. It does not erase every signal.
Why privacy tools receive browser data
A privacy checker can only show what your browser sends by reading those signals. That is why simple mirrors are useful: they make invisible data visible.
Tools to compare
Common tools in this space include BrowserLeaks, EFF Cover Your Tracks, AmIUnique, BrowserScan, Iphey, Fingerprint.com, Scrapfly, and Browser X-ray.
Compare them by:
- signal depth
- clarity of explanation
- whether results are easy to understand
- whether the tool itself explains data handling
- whether it separates cookies from fingerprinting
Practical steps to reduce exposure
- keep browsers updated
- limit extensions
- review site permissions
- use privacy-focused browser settings
- block third-party cookies where appropriate
- avoid logging into everything in the same browser profile
Open Browser X-ray to see what your browser exposes right now: /tools/browser-x-ray.html.
Frequently asked questions
What can a website see about my browser?
A lot: your IP address, user agent, screen size, language, timezone, WebGL and canvas fingerprints, installed fonts, and permission states. Together these can form a fairly unique fingerprint even without cookies.
What is the difference between cookies and browser fingerprinting?
Cookies are small files a site stores on your device that you can clear. Fingerprinting derives an identifier from your browser's characteristics, screen, fonts, GPU, which you can't simply delete. Fingerprinting works even in private mode.
Do browser privacy checkers themselves receive my data?
By design they read the same signals your browser exposes to any site. A privacy mirror like Browser X-ray runs entirely in your browser and sends nothing to a server, the point is to show you the exposure, not collect it.