Browser & System Info

Why any of this is visible

A browser volunteers a certain amount about itself so that sites can work properly: which languages you read, whether your system prefers a dark page, how many touch points the screen has. Some of it is sent with every request, and the rest can be asked for in a line of code. None of it is a secret, and none of it is something this page had to dig for.

Seeing it in one list is uncomfortable in a useful way. Each answer on its own is unremarkable; together they are what advertising companies combine into a "fingerprint". The difference between this page and one of those is what happens next: here, nothing.

Three things that are true of this page

1. 1

   Everything here is what your browser tells any website you visit. Seeing it on ScreenTail changes nothing about what you reveal elsewhere.

2. 2

   Nothing is sent anywhere. There is no server to send it to: the page runs entirely in your browser, and closing the tab ends it.

3. 3

   Your IP address is not shown, because finding it would mean asking another company's server — which is exactly the kind of request this site does not make.

Reading the answers

"Not reported" means the browser did not answer, not that the answer is zero or no. Several of these questions are deliberately unanswered in some browsers, and one — the user-agent string — is increasingly frozen or trimmed on purpose, so a version number inside it can be out of date by design. Processor cores and device memory are rounded before they are offered, precisely so that they identify fewer people.

"Do not track" is a request rather than a control. Most browsers stopped sending it because no site was obliged to honor it, and a browser that still sends it cannot make anyone comply.

For the numbers about the screen rather than the browser, see Screen Resolution. What this site itself does and does not collect is set out on the Privacy Policy.