User Agent Parser: Analyze Browser & Device Information
Our user agent parser instantly analyzes any user agent string to reveal browser, operating system, device type, and rendering engine information. See your own user agent with parsed details, or analyze any user agent string from logs or analytics.
User agent parsing is essential for web analytics, feature detection, browser compatibility testing, and identifying bots from real users. This tool uses the UAParser.js library for accurate, up-to-date device detection.
What Is a User Agent?
A user agent string is a text identifier sent by web browsers and other HTTP clients with every request. It typically includes information about the browser name and version, operating system, device type, and rendering engine. Servers use this information to serve appropriate content.
Example: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/120.0.0.0 indicates Chrome 120 on Windows 10 64-bit.
Information Extracted
Browser: Name (Chrome, Firefox, Safari, Edge) and version number.
Operating System: Windows, macOS, iOS, Android, Linux with version.
Device Type: Desktop, mobile, tablet, smart TV, game console, or wearable.
Device Details: Vendor (Apple, Samsung) and model when available.
Rendering Engine: Blink, Gecko, WebKit, or EdgeHTML.
CPU Architecture: x64, ARM, or other processor types.
Common Use Cases
Analytics: Understand which browsers and devices your visitors use.
Compatibility: Test how your site appears to different browsers/devices.
Bot Detection: Identify crawlers, scrapers, and automated traffic.
Debugging: Reproduce issues by understanding client configurations.
A/B Testing: Target specific browser or device segments.
FAQ
Why do many user agents say "Mozilla"?
The "Mozilla/5.0" prefix is a historical artifact. Back when Netscape Navigator was the dominant browser, servers often checked for "Mozilla" to serve modern content. Other browsers adopted this prefix for compatibility, and it persists today.
How reliable is user agent detection?
User agents can be spoofed, and some browsers share similar strings. It's reliable for analytics but shouldn't be used for security. For feature detection, prefer JavaScript APIs like Modernizr over user agent parsing.
What about privacy and user agent reduction?
Chrome and other browsers are reducing user agent information to improve privacy. The User-Agent Client Hints API is the modern replacement, providing the same information with user consent.