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Browser Fingerprint Test

By Vathanakone Prakosay · Updated on · 5 min read

In short

This browser fingerprint test shows the values your browser hands to every website without asking: a canvas fingerprint, screen size, CPU cores, languages, time zone and more. Trackers combine these values into a browser fingerprint that can identify you without cookies. The test runs only in your browser and stores nothing.

Browser fingerprint testruns in your browser

This test sends no request to anyone. It only reads values your browser already gives to every website, and it does not create, save or share a fingerprint ID. Nothing runs until you click. Results stay in your browser; we do not store or receive them. Checks marked ↗ send one request to a third party (see Privacy, section 3.3).

    How does this browser fingerprint test work?

    The test reads values through the same JavaScript interfaces that any website can use, and shows them to you. It is fingerprint testing in the open: you see the data, nobody else gets it.

    Many sites that call themselves a "fingerprint tester" are services that collect fingerprints for fraud checks or tracking. This page is different: it sends nothing, saves nothing and gives you no identifier.

    What does each value reveal?

    Each value is common on its own. The combination is what makes a browser fingerprint unique.

    ValueWhy trackers use it
    Canvas hashDepends on your operating system, fonts and graphics stack. One of the strongest single attributes (Laperdrix et al., 2019).
    Screen and pixel ratioSeparates phones, laptops and monitors with different screen resolution.
    CPU cores, device memoryNarrows down the hardware.
    Languages and time zonePoint to your region, even behind a VPN.
    User agentNames the browser version and operating system.
    Do Not Track, GPCPrivacy signals; switching them on can itself make you stand out.

    How unique is a browser fingerprint?

    It depends on who you compare with. In the EFF's 2010 study, 83.6% of 470,161 browsers had a unique fingerprint, but the visitors were privacy-aware volunteers (Eckersley, 2010). A 2018 study of 2,067,942 fingerprints from a large French website found that only 33.6% were unique (Gómez-Boix et al., 2018). The same study found that a non-unique fingerprint can become unique when only a few values change.

    This test cannot tell you how unique you are, because it does not compare your values with other visitors. That would require collecting fingerprints, which we do not do. The EFF's Cover Your Tracks project measures uniqueness against its own dataset; check its terms before you use it.

    Does a VPN or incognito mode stop browser fingerprinting?

    No. A VPN changes your IP address, not the values in this list. Private browsing deletes cookies after the session, but your canvas hash, screen and fonts stay the same. Browser fingerprinting works without cookies, which is why trackers use it.

    How can I reduce my browser fingerprint?

    The best protection makes many browsers look the same or adds noise to the values.

    Run the browser fingerprint test before and after a change. Values that read "not shared" or change on every run show that your protection works.

    Is browser fingerprinting legal?

    In the EU, fingerprinting for tracking usually needs your consent. The Article 29 Working Party stated in 2014 that the ePrivacy consent rule applies to device fingerprinting (Article 29 WP, 2014). Fraud prevention and security can be treated differently.

    Related tests

    Your time zone is part of the fingerprint and can contradict your VPN location: check it with the timezone leak test. For the background, read Browser fingerprinting explained and the canvas fingerprinting guide.

    FAQ

    How can I check my browser fingerprint?

    Click "Show my browser fingerprint" above. The test lists the values your browser shares with every website. It runs locally and sends nothing.

    Can incognito mode prevent browser fingerprinting?

    No. Incognito mode deletes cookies and history after the session. The values in a browser fingerprint, such as screen size and canvas output, stay the same.

    Do VPNs stop fingerprinting?

    No. A VPN hides your IP address. Your browser still shares the same fingerprint values.

    Can I prevent fingerprinting by using several browsers?

    Partly. Each browser has its own fingerprint, so sites cannot easily link them. But some values come from your hardware and operating system and can match across browsers.

    Does SpeedIQ store my fingerprint?

    No. The browser fingerprint test runs only in your browser. It sends no request and stores nothing.

    More checks on SpeedIQ

    Sources