Overview
The User-Agent Detector reads and parses your browser’s User-Agent string, extracting and displaying detailed information including browser name and version, operating system and version, device type (Desktop, Mobile, Tablet), rendering engine, and CPU architecture. It also shows all relevant navigator properties available in the current browser environment.
How to Use
The tool runs automatically on load — no input required. The main card at the top shows Browser, OS, Device Type, and Engine with large labeled badges. Below that, the full raw User-Agent string is displayed in a monospace box with a copy button. The Navigator Properties table lists all accessible navigator object values including platform, language, cookieEnabled, onLine status, hardware concurrency (CPU threads), and device memory. A compatibility note explains any properties not available in the current browser.
Background & Context
The User-Agent string was introduced in the early days of the web so servers could serve different content to different browsers. Netscape Navigator established the original format in the 1990s. However, User-Agent sniffing is now widely discouraged because the strings became extremely complex over time as browsers impersonated each other for compatibility — for example, all modern browsers include ‘Mozilla/5.0’ despite not being Mozilla products. Google Chrome is deprecating User-Agent in favor of the more structured User-Agent Client Hints API (navigator.userAgentData), which provides structured, privacy-preserving browser information.
