What is my user agent?
The user agent string tells websites which browser and device you appear to be using. It is sent automatically with Hypertext Transfer Protocol requests.
User-Agent string
FAQ
A user agent is a text string your browser sends with every request. It describes the browser, engine, and often OS or device so websites can adapt content or diagnose compatibility issues.
- Chrome/Edge:DevTools (F12) → Cmd/Ctrl+Shift+P → “Show network conditions” → uncheck “Use browser default” and pick a UA.
- Firefox:about:config → general.useragent.override (create as string).
- Safari:Develop menu → User Agent.
- Extensions:can also set a custom UA.
- Clear the override to restore the default.
No. Browsers always send a User-Agent header. You can only change its contents, not remove it entirely.
Browsers reduce detail to limit fingerprinting and compatibility hacks. You may see generic tokens even though your real browser version is newer.
It is sent to every site you visit and is not a secret. Avoid pasting a full user agent into public posts if you are worried about fingerprinting.