User-Agent Parser
Parse user-agent strings to detect browser, operating system, device, and rendering engine. All processing in your browser.
Browser
Operating System
Device
Rendering Engine
Bot Detection
How to Use User-Agent Parser
Auto-detected or paste UA
Your current user-agent is loaded automatically, or paste any UA string.
Instant analysis
The browser, OS, device, and engine are identified instantly.
Copy results
Copy the full analysis or individual components as needed.
What is a User-Agent?
A user-agent string is an HTTP header that browsers and applications send to websites to identify themselves. It contains information about the browser name, version, operating system, and device. Websites use this to serve appropriate content and track usage.
User-Agent Components
Browser
The application name and version (Chrome 120, Firefox 121, etc.)
Operating System
The underlying OS and version (Windows 11, macOS 14, etc.)
Device Type
Form factor: desktop, mobile, tablet, or other
Rendering Engine
The underlying engine (Blink, Gecko, WebKit, Trident)
Frequently Asked Questions
The parser uses pattern matching against known browser, OS, and engine signatures in the UA string to identify components. Results are best-effort since UA strings can be spoofed.
Yes. The parser identifies common bots, crawlers, and spiders by matching known patterns like Googlebot, Bingbot, and others.
The tool automatically detects and displays your current browser's user-agent string when the page loads.