What websites know about your browser
Your User-Agent explained, device details and browser fingerprint: everything any website sees without asking. Nothing is sent to the server.
Client Hints
Screen
Language and time
Device
Privacy
Browser fingerprint
The fingerprint is a hash of the values on this page. It doesn't depend on cookies or incognito mode, so websites and ad networks use it to recognize your browser on the next visit.
Parse another User-Agent
Everything is detected in your browser. Nothing is sent to the server or stored.
What a website sees when you open it
- 1Open the pageeverything is detected automatically, no permissions or installs
- 2See the breakdownbrowser, system, screen, graphics card and fingerprint
- 3Copy the datawith one button, for support, a developer or comparison
What is a User-Agent
A string your browser sends with every request: browser name and version, engine, operating system and device type. Websites use it to decide which version of a page to show, and analytics tools to count who visits. Because of old compatibility rules almost every string starts with "Mozilla/5.0", which makes it hard to read without a parser.
Client Hints, the replacement for User-Agent
Chromium browsers are gradually trimming the User-Agent: the system version and phone model in it no longer change. A website can request the exact data separately through Client Hints: device model, system version and bitness. Firefox and Safari don't support Client Hints yet.
Browser fingerprint and how websites use it
Even without cookies a browser can be recognized by a mix of traits: screen, time zone, languages, graphics card, number of cores and exactly how the browser draws an image on a canvas. Together they form a fingerprint that rarely matches between different people. It is used by anti-fraud systems of banks and payment services, by ad networks for tracking and by websites hunting for multiple accounts.
You can't hide completely, but you can stand out less: Tor Browser and Brave add noise to the fingerprint, and Firefox has fingerprinting protection. Lots of extensions, on the contrary, make a browser rarer and easier to recognize.
FAQ
Didn't find an answer? Message us and we'll help.
It's shown at the top of this page. The "Copy" button copies the whole string, and "Copy all" also copies the breakdown, screen, graphics card and the rest of the data as one text.
In the User-Agent, Windows 10 and 11 look the same: "Windows NT 10.0". They can only be told apart through Client Hints, so in Chrome and Edge we show the exact version, and in Firefox "Windows 10/11".
Yes: in the browser's developer tools (device mode), with extensions or in settings. But the browser fingerprint won't change, and anti-fraud systems spot right away when the User-Agent doesn't match the other traits.
Most browsers have a rare fingerprint: the mix of screen, graphics card, fonts and time zone is shared by few people. The most alike are recent iPhones with Safari and Tor Browser with default settings.
It adds an invisible block with typical ad names to the page and checks whether the blocker hid it. We do the same. Some blockers ignore such bait, so the result isn't always accurate.
No. Everything is calculated in your browser and sent nowhere. We don't receive the string from the "Parse another User-Agent" field either.
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