No trackers, cookies or permissions. Every site you open can see everything below. Here it is only shown: the check runs in your browser, nothing is stored or sent — see for yourself in the Network tab.
whoami --you
# server — sees it in every request
ip:216.73.217.176# IP address: reveals your ISP and rough location. This site doesn't store it — far from every site can say that.
user_agent:Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)# Browser, its version and OS — in every request.
accept_language:none# Languages from your browser settings. This site picked the page language from them.
referer:none# The page you came from, if your browser sent it.
do_not_track:none# The “do not track” signal. It's a polite request, not a block: most sites ignore it.
client_hints:none# Chromium browsers report the platform and device type in separate headers.
# script — learns it without permission
platform:# OS and browser as seen by a script — sometimes more precise than the User-Agent string.
languages:# All languages from your settings, in order.
timezone:# Your time zone gives away your region even behind a VPN.
screen:# Screen resolution, scaling and colour depth — a big part of the fingerprint.
hardware:# CPU core count and approximate memory.
gpu:# Your GPU model via WebGL — one of the most distinguishing traits.
fonts:# Installed fonts reveal your OS and software. A few dozen popular ones are checked here.
canvas:# The same drawing comes out slightly differently on different GPUs, drivers and fonts. The image hash is almost unique.
webrtc:# Local IP via WebRTC. Modern browsers hide it behind a random .local address.
prefs:# Dark mode, reduced motion, touch screen.
connection:# Network type and speed — if the browser reports them.
Why it matters
On their own these details are harmless. Together they form a browser fingerprint: in the EFF Panopticlick study, the combination was unique for more than 80% of browsers. A fingerprint isn't stored on your device, can't be cleared with cookies, and lets ad networks recognise you across sites.
How to protect yourself
Tor Browser — all users look the same: window size, fonts, time zone.
Firefox: enable privacy.resistFingerprinting in about:config. Brave and Mullvad Browser protect you by default.
uBlock Origin blocks known tracking scripts and a VPN hides your IP — but not your time zone or fingerprint.
Fewer extensions and unusual fonts — fewer differences from everyone else.