What Is My User Agent? – Browser, OS & Device Detector
See the user agent string your browser sends to every website and what it means: browser, version, operating system, device type and rendering engine.
Your user agent is shown at the top with a copy button. Below it, the tool translates it into browser and version, operating system, device type (desktop, tablet or mobile) and engine, and adds your language, time zone and touch support. Paste any other user agent string to analyse it too.
How to use What Is My User Agent
- Open the page — your user agent is detected automatically.
- Read the browser, OS, device and engine summary.
- Click Copy to share the full string with a support team.
- Paste another user agent string into the box to analyse it.
- Compare client hints if your browser supports them.
What is a user agent?
Every time your browser loads a page, it sends a short text called the user agent. It names the browser, its version, the operating system and the rendering engine. Websites use it for statistics, to offer the right download or to work around bugs in specific browsers.
A typical user agent looks confusing because of history: nearly every browser still starts with "Mozilla/5.0" and mentions other browsers for compatibility. That is why a parser is useful.
How to read it
| Part | Example | Meaning |
|---|---|---|
| Mozilla/5.0 | — | Historical, present in almost all browsers |
| (Windows NT 10.0; Win64; x64) | — | Windows 10 or 11, 64-bit |
| AppleWebKit/537.36 | — | Engine family |
| Chrome/126.0.0.0 | — | Browser and version |
| Safari/537.36 | — | Compatibility token |
Edge adds "Edg/", Opera "OPR/", Samsung Internet "SamsungBrowser/". Firefox uses "Gecko" and "Firefox/".
Frozen and reduced user agents
To protect privacy, Chrome and other browsers now "freeze" parts of the string. Windows 11 still reports "Windows NT 10.0", and macOS versions are capped at 10.15.7. Minor version numbers are shown as zeros. Detailed values are available through client hints, which this page shows when your browser supports them — they reveal the real platform version and device model when a site asks.
When you need it
- Support teams often ask for it when reporting a bug.
- Developers use it to test how a site handles different browsers.
- It helps you check which browser version you are running.
Can a user agent be changed?
Yes. Browser developer tools can send a different one, and some extensions do it automatically. That is why websites should not rely on it for security. If the result here looks wrong, a privacy extension or device emulation may be active.
Your privacy
The user agent is sent to every site you visit anyway; this page only reads it in your browser and shows it to you — nothing is stored or logged. For your display details, see Screen Resolution. Decoding other technical strings? Try the JWT Decoder or URL Encode / Decode.
You may also find these free tools useful: Keyboard Tester, Gamepad Tester and Screen Resolution.
Frequently asked questions
What is my user agent?
It is shown at the top of this page. It is the text your browser sends to websites to identify itself.
Why does Chrome say Mozilla and Safari?
For historical compatibility. Almost every browser includes these tokens so older websites do not block them.
Why does Windows 11 show as Windows NT 10.0?
Browsers froze this value. Client hints can report the real platform version.
Can websites see my user agent?
Yes. Every browser sends it with each request. This page only shows it to you and stores nothing.
How can I change my user agent?
Use your browser’s developer tools (device emulation) or an extension. It does not change your real browser.
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