What your browser tells every website
Every time you open a web page, your browser shares a handful of technical details so the site can render correctly. None of this requires a login or special permission — it is part of how the web works. This page simply reads those details with standard browser APIs and displays them back to you, so you can see exactly what is visible to the sites you visit.
The most identifying piece is the user agent: a single line of text that names your browser, its version and your operating system. From it, this page parses a friendly summary like "Chrome 124 on Windows". Alongside that it reads your screen resolution (the total pixels on your display), the available screen (the screen minus system bars), and the live window / viewport size (how big the browser content area is right now).
Reference note: values come from your browser's navigator, screen and Intl APIs. A user agent is a best-effort hint, not a guarantee — browsers can freeze, shorten or spoof it, so a parsed browser name is occasionally approximate.
What each detected field means
| Field | What it means |
|---|---|
| Browser | The name and version of the program you use to browse — e.g. Chrome 124, Firefox 126, Safari 17. |
| Operating system | The system your device runs, such as Windows, macOS, Linux, Android or iOS. |
| Screen resolution | The full width × height of your display in pixels (screen.width × screen.height). |
| Available screen | The usable screen area excluding fixed system bars like the taskbar (screen.availWidth × screen.availHeight). |
| Window / viewport | The current size of the browser content area (innerWidth × innerHeight); updates as you resize. |
| Device pixel ratio | Physical pixels per CSS pixel. 1 is standard; 2–3 indicates a high-density / Retina display. |
| Color depth | Bits used per pixel for color, typically 24 (about 16.7 million colors). |
| Language | Your browser's preferred language (navigator.language), e.g. en-US. |
| Time zone | Your local time zone as reported by Intl.DateTimeFormat, e.g. Europe/Vilnius. |
| Cookies enabled | Whether your browser currently accepts cookies (navigator.cookieEnabled). |
| Do Not Track | Whether you have enabled the optional Do Not Track preference. |
| Online status | Whether the browser currently believes it has a network connection. |
| Touch support | Whether the device reports a touchscreen. |
| Logical CPU cores | Number of logical processors available (navigator.hardwareConcurrency). |
| Device memory | Approximate RAM in gigabytes, when the browser exposes it (navigator.deviceMemory). |
| User agent | The raw identification string your browser sends to every site. |
Frequently asked questions
- What is my browser and version?
- Your browser is the program you use to view websites — Chrome, Firefox, Safari or Edge — and the version is the specific release number. This page reads it from the data your browser shares and shows it at the top of the results.
- What is my screen resolution?
- Screen resolution is the total number of pixels your display can show, written as width by height, for example 1920 × 1080. This page reports it from your screen settings, along with the available area that excludes system bars.
- What is the difference between screen resolution and window size?
- Screen resolution is the full size of your monitor in pixels. Window size (the viewport) is how much of that screen the browser content area uses right now, which is smaller when the window is not maximized. This page shows both and updates the window size live.
- What is a user agent?
- The user agent is a short text string your browser sends to every website to identify itself, including the browser name, version and operating system. This page shows the raw string with a button to copy it.
- What is device pixel ratio?
- Device pixel ratio is how many physical screen pixels make up one CSS pixel. A value of 1 is a standard display; 2 or 3 is a high-density or Retina display, where text and images look sharper.
- Do you store or upload my information?
- No — everything here is detected locally in your browser and shown only to you. Nothing is sent to a server, logged or stored. Your public IP is not shown because that would need a server, which we intentionally do not use.