What Is My User Agent? See and Decode Your UA String
Your user-agent string
Browser
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Rendering engine
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Operating system
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Device type
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Your browser sends a user-agent string with every page it requests — and this page shows you yours the moment it loads. Below the raw string you get a plain-English breakdown: which browser and version you run, its rendering engine, your operating system, and whether you look like a desktop, mobile, or tablet visitor. You can also paste any other user-agent string to decode it.
How it works
- 1 Your user agent shows automatically When the page loads, the raw user-agent string your browser sends appears in the box, already parsed into browser, engine, OS, and device type below.
- 2 Copy it with one click Press Copy to put the full string on the clipboard — handy for bug reports, support tickets, or testing configurations.
- 3 Paste any UA string to decode it Replace the text in the box with any user-agent string — from a server log, an email header, or another device — and the breakdown updates as you type. Press My User Agent to get your own back.
Your data stays private
All processing happens entirely in your browser. No files, text, or data are ever sent to our servers. You can disconnect from the internet and this tool will still work.
Frequently asked questions
- What is a user-agent string?
- It is a short text label your browser attaches to every HTTP request, identifying the browser, its version, the rendering engine, and the operating system. Web servers read it to adapt content — or just log it.
- Why does my user agent say Mozilla when I use Chrome?
- History. Early websites served advanced features only to Netscape ('Mozilla'), so every later browser claimed to be Mozilla to avoid being served a stripped-down page. Chrome's UA still lists Mozilla, AppleWebKit, and Safari — the actual browser is the Chrome/xx token.
- Can websites identify me by my user agent?
- Not on its own — thousands of people share your exact string. But combined with screen size, timezone, fonts, and other signals it contributes to browser fingerprinting. Modern browsers freeze parts of the UA to reduce this.
- Can I change or fake my user agent?
- Yes. Chrome, Firefox, and Edge DevTools let you override it per tab (Network conditions in Chrome), and extensions can switch it permanently. Sites will then treat you as the browser you claim to be — useful for testing mobile layouts.
- Why do different sites show me a different user agent?
- Some browsers send a reduced UA to some sites, and Client Hints can replace parts of it. VPN and privacy extensions also rewrite the string. This tool shows exactly what your browser reports to JavaScript via navigator.userAgent.
- Is my user-agent string sent to a server here?
- No. The string is read and parsed entirely in your browser with JavaScript — nothing is uploaded, logged, or stored. It works offline once the page is loaded.
From the blog
What Your User Agent Says About You (and Why It Lies) How to read a user-agent string, why every browser claims to be Mozilla, and when faking your UA is genuinely useful. Read the post →Related tools
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