User Agent Parser

Parse and analyze user agent strings to identify browser, operating system, and device information.

Your User Agent:

User Agent String:

About User Agents

A User Agent is a string that web browsers and other HTTP clients send to identify themselves to web servers. It contains information about the browser, operating system, and device.

User Agent Structure

A typical user agent string contains several components:

Mozilla/5.0 - Historical compatibility token (present in most browsers)
Platform - Operating system and architecture (e.g., Windows NT 10.0; Win64; x64)
Engine - Rendering engine (e.g., AppleWebKit/537.36, Gecko/20100101)
Browser - Browser name and version (e.g., Chrome/120.0.0.0, Firefox/121.0)

Common Rendering Engines

Blink - Chrome, Edge, Opera, Brave (based on WebKit)
WebKit - Safari, older Chrome
Gecko - Firefox
Trident - Internet Explorer
EdgeHTML - Legacy Microsoft Edge

Why User Agents Matter

Content Negotiation: Servers can deliver different content based on browser capabilities
Analytics: Track browser and device usage statistics
Compatibility: Detect and work around browser-specific issues
Security: Identify potentially malicious bots or scrapers

User Agent Spoofing

User agents can be easily modified or "spoofed" by users or browser extensions. This is commonly done to:

Access websites that block certain browsers
Test how sites appear to different browsers
Enhance privacy by hiding browser/device information
Bypass bot detection (though this may violate terms of service)

Note: User agent strings are becoming less reliable for detection as browsers implement privacy features that reduce or freeze the information they share. Modern web development should rely on feature detection rather than user agent sniffing.

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