User Agent Parser
Parse and analyze user agent strings to identify browser, OS, device, and engine information. Free online UA parser.
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How to Use This User Agent Parser
- Your current browser's User-Agent string is automatically loaded.
- Optionally paste a different User-Agent string to analyze.
- Review the parsed results showing browser, engine, OS, device, and CPU details.
- Use the copy button to copy the User-Agent string for documentation or testing.
About User-Agent Strings
A User-Agent string is a piece of text that web browsers and other applications send to websites to identify themselves. It contains information about the browser, rendering engine, operating system, device type, and more.
Tip
User-Agent parsing is commonly used for analytics, browser compatibility checks, and serving optimized content to different devices.
Key Features
- Detects browser name and version (Chrome, Firefox, Safari, Edge, etc.)
- Identifies the rendering engine (Blink, Gecko, WebKit)
- Parses operating system name and version
- Recognizes device type (desktop, mobile, tablet)
- Detects CPU architecture (x86, ARM, etc.)
- Auto-loads your current browser's User-Agent
- Supports custom User-Agent string input for testing
Common Use Cases
- Analyzing web traffic and browser usage statistics
- Testing browser detection logic in web applications
- Debugging device-specific rendering issues
- Identifying bot and crawler traffic from User-Agent strings
- Serving device-optimized content and layouts
- Auditing User-Agent strings for privacy and fingerprinting
Frequently Asked Questions
Why are User-Agent strings so long and complex?
User-Agent strings evolved over decades of browser history. New browsers added tokens from older browsers to ensure website compatibility. For example, Chrome includes 'Mozilla', 'AppleWebKit', and 'Safari' tokens because websites historically checked for those strings to serve content.
Can User-Agent strings be spoofed?
Yes, User-Agent strings can be easily changed by browser extensions, developer tools, or custom HTTP clients. You should never rely solely on User-Agent detection for security decisions. It is useful for analytics and progressive enhancement but not for access control.
What is User-Agent Client Hints?
User-Agent Client Hints is a newer API that replaces the traditional User-Agent string with structured, on-demand headers. It improves privacy by sending less information by default and lets servers request specific details they need. Chromium-based browsers already support this standard.