User Agent Parser – Detect Browser, OS & Device
Free user agent parser. Analyse any user agent string to detect browser, version, operating system, device type and engine instantly.
User agent parser – Free Online Tool
Our free User Agent Parser reads any user agent string and tells you which browser, operating system, device and rendering engine it belongs to. It also detects your own user agent automatically.
What is User agent parser?
A user agent is a text string that every browser sends to websites with each request. It describes the browser name and version, the operating system and sometimes the device model.
Raw user agent strings are long and confusing — for example they often mention “Mozilla” even for Chrome. A parser breaks them into clear, readable details.
How to use the User agent parser
- Open the tool to see your own user agent, or paste another one.
- Click submit to parse it.
- Review the detected browser, OS, device and engine.
- Use the details for debugging or analytics.
Key features
- Detects browser, version, OS and device type
- Recognises mobile, tablet and desktop
- Auto-detects your current user agent
- Free and instant
Common use cases
- Debugging browser-specific website bugs
- Analysing visitors in server logs
- Identifying bots and crawlers such as Googlebot
- Providing details to tech support
Frequently asked questions
Why do all user agents mention Mozilla?
For historical compatibility reasons, nearly all browsers include “Mozilla/5.0” at the start.
Can a user agent be faked?
Yes. Users and bots can change their user agent, so it should not be used for security decisions.
Is user agent the same as IP address?
No. The user agent describes software; the IP address identifies a network connection.
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