What Is My User Agent? See Your Browser and Device Details
YOUR USER AGENT
What is a user agent?
A user agent is a short text your browser sends to every website. It names the browser, its version, the operating system and sometimes the device, so sites can send pages that fit.
Support teams often ask for it when you report a website problem. Copy it above and paste it into your message.
Reading a user agent string
| Part | Example | Meaning |
|---|---|---|
| Mozilla/5.0 | Mozilla/5.0 | Historic prefix kept for compatibility |
| Platform | (Windows NT 10.0; Win64; x64) | Operating system and CPU |
| Engine | AppleWebKit/537.36 | Rendering engine |
| Browser | Chrome/120.0 | Browser and version |
| Mobile marker | Mobile Safari | Phone version of the page |
Why your user agent matters
- Websites choose mobile or desktop layouts.
- Download pages offer the right version for your system.
- Analytics count browsers and devices.
- Some sites block outdated browsers for security.
Modern browsers are reducing the detail in user agents for privacy, using User-Agent Client Hints instead.
Can you change your user agent?
Yes. Developer tools in Chrome, Edge and Firefox let you switch to another device or browser for testing. Extensions can change it permanently, but some sites may then show the wrong layout.
Client hints are replacing user agents
Browsers like Chrome and Edge now send a reduced user agent string and share details through Client Hints instead. Websites ask for specific information, like the platform or device model, when they need it. That improves privacy, but it means some older tools show less detail than they used to. Our tool shows what your browser shares with every site.
Fix “browser not supported” messages
- Update your browser to the latest version.
- Turn off any user agent switcher extension.
- Try another browser like Chrome, Firefox, Edge or Safari.
- On a phone, request the desktop site from the browser menu if the mobile version is limited.
User agents on phones, TVs and consoles
It isn’t just browsers that send a user agent. Smart TVs, games consoles, streaming sticks and apps all identify themselves to the servers they talk to. That’s how streaming services decide whether to offer 4K, and how websites pick a mobile or desktop layout. If a TV app refuses to play in high quality, an outdated device or app version is often the reason.
Frequently Asked Questions
What is my user agent?
It is shown at the top of this page, along with your browser, operating system and device type.
Is a user agent personal information?
It does not name you, but combined with other data it can help identify a device.
Why does my user agent say Mozilla?
For historical compatibility. Almost every browser includes it.
Can websites see my user agent?
Yes. Your browser sends it with every request.
Does the user agent show my IP?
No. Check your IP with our What Is My IP tool.
Last verified: November 2026.