What does any site see about you?
Your IP and provider, browser, language, time zone, screen and graphics card: every website gets this the moment you open it, without asking. See how unique it makes you and whether WebRTC gives away your real IP behind a VPN.
Every site you open gets this address with each request, and can look up the provider and the approximate place in a second. No permission is needed.
Even without cookies, a site can combine small details of your browser into a fingerprint and recognise you on the next visit.
IP and provider
IP address, provider, country and city, IPv6.
WebRTC leak
Whether the browser reveals another IP address than the one sites see, for example your real one behind a VPN.
Browser and device
Browser, system, processor cores, memory, privacy signals.
Language and time
Languages, time zone, date and number formats.
Screen
Resolution, pixel density, colours, theme.
Graphics and fingerprints
Graphics card (WebGL), canvas and audio fingerprints, installed fonts.
DNS leaks are not tested here
To find out which DNS server turns site names into addresses for you, a test has to make your browser look up random one-time names under its own domain, and that domain’s DNS server has to note who asked. fof.lol is a static site without a server of its own, so such a test cannot be done honestly here, and we would rather say so than show a guess.
If you use a VPN, check DNS on a dedicated page such as dnsleaktest.com or browserleaks.com/dns. With the VPN on, you should see only your VPN provider’s DNS servers, not those of your internet provider.