Free User Agent Parser

What is a User Agent String?

A User Agent (UA) string is a header sent by web browsers to web servers with every request. It contains details about the browser type, version, engine (such as WebKit or Gecko), operating system (Windows, macOS, Linux, iOS, Android), and device type (mobile, desktop, tablet). A user agent parser reads this long string of text and parses it into organized, understandable details.

Developer Debugging and Compatibility Check Use Cases

Web developers use a parse user agent tool to troubleshoot browser-specific compatibility issues. If users report layout bugs, developers can inspect their user agent strings to identify their exact browser version and operating system. This information is also useful for analytics engines, helping companies understand what devices visitors use to optimize their site experience.

Important Security and Limitations Note

While a browser user agent checker is highly useful, remember that user agent strings can be spoofed or modified. Browsers, crawlers, and scrapers can alter their user agent headers to mimic other systems. Therefore, do not rely on user agents for critical security verification. All parsed output on this page is escaped before rendering, protecting you from malicious scripts hidden inside fake user agent headers.