All tools Toolbox

What does this website know about me?

You have not clicked anything, entered anything or allowed anything. Even so, this page is about to show which device you use, where you are and how full your battery is. Not because this page does anything special — but because every website can.

On your own device

Scan this code with your phone and open the same page there.

The values differ from those on this screen — different device, different fonts, different fingerprint. In a talk, this very comparison is the moment it clicks. And the self-tests further down work better on a phone anyway: a desktop computer has no location or motion sensors.

None of this is stored. Everything below runs in your browser and is gone as soon as you close the window. There is no database behind it, no analysis and no sharing. What the server saw is shown first — it has nothing more.

What the server saw when you opened the page

Your browser sends this information with every single page request, to every website. Opened on 09.10.2026 06:25:56.

Your IP address 216.73.217.63 A public IPv4 address. Your provider knows which connection had it at this moment and must disclose that under a court order. Commercial services map it to a city or region — usually roughly, sometimes surprisingly precisely. Without a VPN it appears in the logs of every site you visit.
Connection encrypted (HTTPS) The content is protected in transit. Your provider can still see that you visited this page.
Browser identifier Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com) Name and version of your browser and operating system. Often enough on its own to single you out within a small group.
Accepted formats */* Which content types your browser can handle.
Compression gzip, br, zstd, deflate Which compression methods your browser understands.
Referring page https://secureit.icu/en/tools/spurenleser The page you came from. With search engines, this used to include your search term.

Examine yourself

So far nothing has happened that does not happen on every website. The following tests go further — so each one starts separately and only when you click. What each test does is explained beforehand. Several trigger a prompt from your browser; declining is always a correct answer and is counted as such here.

Here too: the results stay in your window. They are not sent, stored or counted.

What to take away

  • Consent only covers part of it. The cookie banner deals with cookies. Almost everything above works without a cookie.
  • A private window helps less than you think. The fingerprint stays the same.
  • In a company, uniformity is a protection. Where everyone has the same equipment, nobody stands out. A private computer used for working from home, on the other hand, is almost always unique.
  • Permissions are the real boundary. Location, camera, microphone and clipboard require a prompt. If you habitually click them away, you give up the only point where you still get to decide.

This page is the opener I use in training sessions. What comes next is described with the prices.

Set up in an hour, trained in a week.

Create a free account, add your team, unlock the course. You only pay when you start. Would you rather see what a test email looks like first? The self-test is free.

Add your team Test it yourself first