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Your browser's fingerprint

A code made from the details below. Any site can work out the same code and recognise your browser by it, even after you delete cookies or open a private window.

Language and place

Languages: Shows which languages you read, in order of preference.
Time zone: Narrows down where you are, even behind a VPN.

Your device

Browser and system: Your browser, its version and your operating system.
System version: Some browsers give the exact system version when a site asks.
Device model
Platform
Graphics chip: The exact graphics chip often gives away the model of your computer or phone.
Processor cores
Memory (approximate)
Screen: Size and sharpness differ from device to device.
Window size
Colours
Touch screen

Your settings

Colour theme
Reduced motion: An accessibility setting. Settings like this can hint at a health condition.
Higher contrast
Cookies allowed
Do Not Track: A request not to be tracked. Most sites ignore it.
Global Privacy Control: A newer signal that some privacy laws require sites to respect.

Hidden signatures

Canvas drawing: This page drew a small picture out of sight. Each device draws it slightly differently, so the result works like a signature. Some browsers change it on purpose every time.
Installed fonts: Fonts show which programs are installed, for example Microsoft Office or design software.

Connection

Connection speed
Page you came from: Sites usually see which page sent you. Links from Lockwell don't reveal it.
IP address: Every website also sees your IP address, which shows your internet provider and roughly where you are. This page can't show it: that would need a server that records it.

Try it: what autofill gives away

Saved names, addresses and phone numbers are handy. But a page can contain fields you can't see, and your browser may fill those in too. Start typing in the name field and choose one of your browser's suggestions.

This form goes nowhere. What was filled in is shown only here and is erased when you clear it or leave the page. Bank cards are not part of this demonstration.

To protect yourself, turn off address autofill in your browser's settings, or use a password manager that fills in only when you ask.

What websites can't see without asking

Your browsing history and your other open tabs.
Files on your device, unless you choose one yourself.
Passwords you saved for other sites.
Your camera, microphone and exact location, until you allow them.
What you copied, unless you paste it.

Runs in your browser. Nothing is sent or saved.

Good to know

None of the details above needs your permission. Each is harmless alone, but together they form a fingerprint that recognises your browser on different sites, even without cookies.

These values are read by this page and shown only to you. They are not sent or saved.

You can reduce what sites learn: keep your browser updated, use a browser with fingerprinting protection such as Firefox, Brave or Tor Browser, and remove extensions you don't need.