User Agent Parser - Detect Browser, OS & Device Online
Detect the browser, OS, engine and device type from any User-Agent string.
| Property | Detected Value |
|---|---|
| Browser | Unknown |
| Operating System | Unknown |
| Rendering Engine | Unknown |
| Device Type | Desktop |
âšī¸ Detection is heuristic (regex-based) and may not be 100% accurate for every User-Agent string.
What is a User Agent Parser?
A User Agent Parser reads the User-Agent string that every browser sends with each request and identifies the browser, its version, the operating system, the rendering engine and the device type. It turns a long, cryptic string into a clear, structured summary you can actually use.
Why Use a User Agent Parser?
Raw User-Agent strings are hard to read and easy to misinterpret. A parser instantly breaks them down so you can debug device-specific issues, analyze traffic, and understand which platforms your users are on.
- Identify browser name and version
- Detect operating system and version
- Recognize the rendering engine
- Tell mobile, tablet and desktop apart
- Debug cross-browser and device issues
- Inspect your own current User-Agent
Common User Agent Parser Use Cases
Bug Reproduction
Reproduce browser-specific bugs from support tickets.
Analytics
Understand which browsers and devices visitors use.
Responsive QA
Confirm device detection for responsive layouts.
Log Analysis
Decode User-Agents found in server access logs.
Bot Detection
Spot unusual or crawler User-Agent strings.
Feature Targeting
Decide which platforms to test and support.
User Agent Parser for Developers
Our user agent parser is designed for:
- Frontend developers
- QA engineers
- Backend developers
- DevOps engineers
- Web analysts
- Support engineers
- Security engineers
- Product managers
đĨ Video Guide
â FAQs
What is a user agent parser?
A user agent parser reads a browser's User-Agent string and identifies the browser, its version, the operating system, the rendering engine, and the device type.
What is a User-Agent string?
A User-Agent string is text a browser sends with each request to describe itself, including browser and OS details, used by servers to tailor responses.
Does it detect my own user agent?
Yes. The tool can prefill your current browser's User-Agent so you can inspect it instantly, and you can paste any other string too.
What can it detect?
It detects the browser name and version, operating system and version, layout engine, and whether the device is mobile, tablet, or desktop.
Is my data sent to a server?
No. Parsing happens entirely in your browser. Nothing is uploaded or stored.
How accurate is user agent parsing?
User-Agent strings are heuristic and can be spoofed or frozen by browsers, so detection is a best-effort estimate rather than a guarantee.
Is this tool free?
Yes. It is completely free with no registration required.
Which browsers support this tool?
It works on Chrome, Firefox, Safari, Edge, and all modern browsers.