User Agent strings contain information about the browser, operating system, device, and rendering engine. Use this tool to debug client detection issues or analyze traffic patterns.
What is User Agent Parser?
User Agent (UA) strings are identifiers sent by browsers and applications in HTTP requests, revealing information about the client's browser, operating system, device type, and rendering engine. UA parsing helps with browser compatibility testing, traffic analysis, bot detection, and device-specific content delivery. While UA strings can be spoofed, they remain useful for analytics and debugging.
How to Use
- Paste a User Agent string into the input field, or
- Click 'Get My UA' to parse your current browser's UA string
- Click 'Parse' to analyze and extract components
- Review browser, OS, device, and engine information
- Use sample UAs to test different browsers and devices
Why Use This Tool?
Tips & Best Practices
- Click 'Get My UA' to quickly see your current browser info
- Use sample UAs to test detection logic
- Check if UA is a bot/crawler before serving content
- Mobile UAs often include device model information
- Safari UAs may show different format than Chrome
- API clients (axios, curl) have distinct UA patterns
Frequently Asked Questions
What is a User Agent string?
User Agent string is an HTTP header sent by browsers and clients identifying themselves. It contains browser name, version, operating system, device type, and rendering engine. Servers use UA for content adaptation, analytics, and compatibility decisions.
How do I find my User Agent?
Click the 'Get My UA' button on this tool to instantly see your current browser's User Agent string. You can also check in browser developer tools: navigator.userAgent in console, or inspect the User-Agent header in network requests.
Can User Agent strings be trusted?
User Agent strings can be spoofed - browsers allow custom UA strings, and bots may send misleading UAs. UA parsing gives hints about client identity but shouldn't be sole basis for security decisions. Combine UA with other signals for reliable detection.
What devices can be detected?
Desktop (Windows, Mac, Linux), Mobile (iPhone, Android phones), Tablet (iPad, Android tablets), and Bot/Crawler (Googlebot, Bingbot, etc.). Some Android UAs include device model names. iPhones typically show iOS version without model.
Why detect bots via User Agent?
Bot UAs often contain keywords like 'bot', 'crawler', 'spider'. Common bots: Googlebot, Bingbot, Facebookbot, Twitterbot. Identifying bots helps separate real users from automated traffic for analytics, rate limiting, and content serving decisions.
What's the difference between Chrome and Safari UA?
Chrome UAs contain 'Chrome/x.x' and use AppleWebKit engine. Safari UAs contain 'Safari/x.x' but NOT 'Chrome/x.x' - this is key distinction. Both use AppleWebKit, but Chrome adds Chrome identifier. Safari version differs from AppleWebKit version.