What Is My Browser
Instantly see the browser, version, operating system and engine you are using right now, plus your screen, language, time zone and a checklist of the web features your browser supports. Everything is detected locally on your device.
Details
Your user-agent string
Web feature support
Check another user-agent string
How to use the What Is My Browser
- Open the page – your browser, version, OS and engine are detected immediately; nothing to install or click.
- Review the details table for screen size, language, time zone, hardware and preference settings.
- Scroll to Web feature support and use the Supported / Missing filter to see what your browser can and cannot do.
- Press Copy report (or download it) to paste the information into a bug report or a message to IT support.
- Check another user agent by pasting any UA string into the box at the bottom and pressing Check user agent.
What your user-agent string means
A user-agent (UA) string is a line of text your browser sends with every request. It looks cryptic because browsers copied each other's tokens for compatibility over 30 years. Here is a typical Chrome UA split into its parts:
| Token | Meaning |
|---|---|
Mozilla/5.0 | Historic compatibility token sent by every modern browser |
(Windows NT 10.0; Win64; x64) | Operating system and CPU: Windows 10 or 11, 64-bit |
AppleWebKit/537.36 (KHTML, like Gecko) | Engine heritage; Blink forked from WebKit and still reports this frozen value |
Chrome/130.0.0.0 | Browser and major version (minor parts are reduced to zeros) |
Safari/537.36 | Another compatibility token |
Edg/130.0.0.0 | Added by Microsoft Edge after the Chrome token; Opera adds OPR/ |
Because the UA string is being "reduced" for privacy, Chromium browsers now offer User-Agent Client Hints (navigator.userAgentData). A site can ask for high-entropy hints such as the full version list, platform version and CPU architecture. This tool asks for them, which is how it can tell Windows 11 (platform version 13 or higher) from Windows 10.
Browsers and their engines
| Browser | Engine | UA token to look for |
|---|---|---|
| Google Chrome, Chromium | Blink + V8 | Chrome/ |
| Microsoft Edge | Blink + V8 | Edg/ |
| Opera | Blink + V8 | OPR/ |
| Samsung Internet | Blink + V8 | SamsungBrowser/ |
| Brave, Vivaldi | Blink + V8 | Brave looks like Chrome (detected via navigator.brave), Vivaldi adds Vivaldi/ |
| Mozilla Firefox | Gecko + SpiderMonkey | Firefox/ and rv: |
| Apple Safari | WebKit + JavaScriptCore | Version/… Safari/ without Chrome/ |
| Any browser on iPhone/iPad | WebKit | CriOS/ (Chrome), FxiOS/ (Firefox), EdgiOS/ (Edge) |
Why the feature checklist matters
Web apps increasingly depend on APIs that are not available everywhere. If a site says "your browser is not supported", the checklist shows which capability is missing. Common examples:
- WebGL / WebGPU – needed for 3D maps, games and in-browser AI. A "not supported" result often means hardware acceleration is disabled in the browser settings or the graphics driver is blocklisted.
- WebAssembly – powers photo editors, video converters and PDF tools that run locally. All current browsers support it.
- Service Worker – required for installable web apps (PWAs) and offline mode. It is hidden in some private-browsing modes.
- Cookies and storage – if these show as missing, sign-ins and saved settings will not stick. Check that you are not blocking all cookies for the site.
- Web Bluetooth, WebUSB, Web Serial – used by device setup pages; only Chromium-based desktop browsers implement them.
Tip: when you contact technical support, press Copy report and paste the result. It contains everything a support agent usually asks for – browser, version, OS, screen size and enabled features – in one go.
Frequently asked questions
How do I find out which browser version I have?
This page shows it at the top as soon as it loads, for example Chrome 130 or Firefox 131. The full version number is in the Browser card and the details table. You can also open the browser's About page (in Chrome: Settings > About Chrome) which also checks for updates.
Why does it say Windows 10/11 instead of my exact Windows version?
Every browser reports Windows 10 and Windows 11 with the same user-agent token (Windows NT 10.0). Chromium-based browsers can share a precise platform version through User-Agent Client Hints, and when they do this page shows Windows 10 or Windows 11 exactly. Firefox and Safari do not share it, so the tool says Windows 10/11.
Why is my macOS version shown as 10.15.7?
Safari, Chrome and Firefox freeze the macOS version in the user agent at 10.15.7 for privacy, even on newer releases. When Client Hints are available the real version is shown instead; otherwise the page labels the value as frozen.
Is any of my information sent to a server?
No. All detection runs in JavaScript inside your browser and nothing is uploaded or stored. The report only leaves your device if you copy or download it yourself.
What is a rendering engine?
It is the part of a browser that turns HTML and CSS into pixels. Chrome, Edge, Opera, Brave and Samsung Internet use Blink, Firefox uses Gecko and Safari uses WebKit. On iPhone and iPad every browser uses WebKit, so Chrome for iOS reports the WebKit engine.
Why does a feature show as not supported?
Either your browser version does not implement it yet, it is turned off by a setting or policy, or it requires a secure context (HTTPS) or special headers. For example SharedArrayBuffer needs cross-origin isolation and Web Bluetooth is only available in Chromium browsers.
Can websites see all of this information?
Most of it, yes. Any site can read your user agent, screen size, language, time zone and supported features with JavaScript. This page simply shows you what is visible, which is useful for troubleshooting and for understanding browser fingerprinting.