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Browser Fingerprint Test
See what sites can learn about your browser without cookies, and why a VPN does not change it.
Free tools that run in your browser. Nothing you type, open or create is uploaded to NerdBible or anyone else.
Your browser fingerprint ID
Reading what this browser shares. Nothing leaves your device.
What a site can read without cookies
How to make your fingerprint less useful to trackers
- A VPN changes your IP address, not your fingerprint. Every value above stays the same with a VPN switched on, so a site that fingerprints can still recognise this browser.
- Firefox: turn on privacy.resistFingerprinting in about:config, or use Strict tracking protection, which blocks known fingerprinting scripts.
- Brave adds small random noise to canvas, WebGL and audio readings, different for each site, so the hashes stop matching from one site to the next.
- Tor Browser makes every user look as alike as possible: same window sizes, same fonts, same time zone. Blending in is the most effective defence.
- Fewer extensions and fewer custom fonts. Unusual add-ons and fonts make a browser stand out. A plain, up to date browser is harder to single out than a heavily customised one.
- Clearing cookies or using a private window does not change a fingerprint. Try this page in a private window: the ID usually stays the same.
Everything on this page is computed in your browser by the script on the page. Nothing is sent to our server or anyone else, and nothing is stored. We cannot tell you how rare your fingerprint is, because that needs a large database of other people's browsers, which we do not keep. The ID can change after a browser or graphics driver update, and browsers that add random noise (Brave, Firefox with resist fingerprinting, Safari in some modes) may show a new ID each time. For your IP address and connection details, see What's My IP.
How to use it
- Open the page. The test runs straight away in your browser.
- Read the fingerprint ID at the top and the list of components underneath, each with what it reveals.
- Press Run again, or open the page in a private window, to see whether the ID stays the same.
- Try the tips at the bottom, then come back and compare.
Questions
What is a browser fingerprint?
A set of details your browser shares with every site, such as screen size, time zone, fonts and graphics card, combined into one identifier. It can recognise a returning browser without any cookies.
Does a VPN hide my fingerprint?
No. A VPN hides your IP address and encrypts traffic between you and the VPN server, but your browser still reports the same screen, fonts, graphics card and other details.
Which parts identify me the most?
In general the canvas, WebGL and audio readings, the graphics card name and the list of installed fonts carry the most detail, because they depend on your exact hardware, drivers and software. Time zone, language and screen size narrow things down further.
Is my fingerprint sent anywhere by this page?
No. The page has no network code: the readings and the hash are computed on your device and disappear when you close the tab.
Why did my ID change?
Browser updates, new fonts, a different monitor, a zoom change or a graphics driver update all change some readings. Some browsers also add deliberate random noise, which is a good sign for your privacy.
About this tool
About the browser fingerprint test
Websites can recognise a browser without cookies by combining dozens of small details it shares freely. This test collects the same details a tracking script would, explains what each one reveals, and combines them into a single fingerprint ID so you can see how stable it is.
It reads your user agent and client hints, languages, time zone, screen size, processor threads, memory and touch support. It then runs the techniques trackers rely on most: a hidden canvas drawing, a WebGL drawing and graphics card name, an audio signal rendered silently, and a check for around fifty common fonts.
- Private by design: every reading and the SHA-256 hash are computed in your browser. Nothing is sent or stored.
- Honest about limits: we do not claim a uniqueness score, because that needs a database of other people's browsers.
- Practical: run it again in a private window, or after changing a setting, and compare the ID.
A VPN hides your IP address but leaves every one of these values untouched. The tips under the results explain what does help, from Firefox's fingerprinting protection to Brave and Tor Browser.
Related tools
- What's My IP & BrowserYour IP address, location and what your browser tells every site you visit.
- WebRTC Leak TestChecks whether your browser exposes your real IP behind a VPN.
- Has My Password Leaked?Checks a password against known breaches without ever sending it.
- Link CleanerRemoves tracking codes from links before you share them.