Your staff are recognised
Ad networks and data brokers use fingerprints to link visits from the same computer across websites – without cookies and in private windows too.
What your browser gives away
Any website can recognise you without cookies. Below is what this page can see about you right now. Everything is worked out in your own browser: we send and store nothing.
Your browser fingerprint
This code is worked out only from the properties of your device and browser. No cookies or stored data are used.
Try it yourself
- Remember the code.
- Open this page in a private window, or clear your cookies and come back.
- The same code means any website can recognise you the same way.
If the code changed, your browser adds random noise to fingerprints. Safari, Brave and Firefox's private windows do this, for example – which is good. The code also changes if you open the page on another screen, because the screen is one of the signals.
What this page worked out about you
All signals
Each line on its own is fairly harmless. Together they make a fingerprint that is often unique.
| Signal | What the browser said | Identifying power |
|---|
* Not used for the code, because these change over time or in a private window.
Everything above was worked out in your browser and stays there. Check for yourself: your developer tools' network view (F12 → Network) shows only this page's own files.
How unique am I?
We can't give you an exact figure: that would mean comparing your fingerprint with other visitors' and keeping them. We don't do that.
Large studies have found that, depending on the sample, between a third and nine in ten desktop browsers are unique: 84% in EFF's Panopticlick (2010), 89% in AmIUnique (2016) and 34% in a 2018 study of two million browsers on a French website.
How to protect yourself
- Use a browser that spoils fingerprints: Safari, Brave, or Firefox with strict tracking protection.
- Keep extensions and extra fonts to a minimum: each one makes you easier to tell apart.
- Keep your browser up to date: old versions are rare and so easier to recognise.
- For very sensitive browsing use Tor Browser: it tries to make every user look the same.
What it means for a company
Attackers use the same technique
Phishing pages check the visitor's fingerprint: security researchers and automated scanners see a harmless page, victims see the real trap.
So do defenders
Banks and web shops use fingerprints to stop fraud. When someone logs in to your account from an unfamiliar device, they notice.
Tracking needs consent
If your website uses fingerprints to track visitors, European law requires consent for it, just as it does for cookies.
Do your staff know what their browser gives away?
We help small companies understand how trackers and attackers work, and put in place protections that actually help.