User-Agent Parser
Analyze any User-Agent string to detect browser, OS, device type, rendering engine, and bot status.
Features
Comprehensive User-Agent analysis
Detailed Detection
Identifies browser name and version, operating system, device type, and rendering engine.
Bot Detection
Detects major search engine bots like Googlebot, Bingbot, and common crawlers.
Real-Time Parsing
Results update instantly as you type with debounced auto-parsing.
Preset Library
Test with common User-Agent strings including bots, mobile devices, and legacy browsers.
How to Use
Analyze User-Agent strings in three steps
Enter User-Agent
Your browser's User-Agent is pre-filled, or paste any UA string to analyze.
View Results
See detected browser, OS, device type, engine, and bot status displayed in organized cards.
Try Presets
Select from common User-Agent presets to test different browsers, devices, and bots.
Frequently Asked Questions
A User-Agent string is a text identifier that your browser sends with every HTTP request. It tells the server what browser, operating system, and device you are using. Websites use this information to serve optimized content.
Yes, your User-Agent is sent with every HTTP request as the User-Agent header. It is visible to every website you visit, along with your IP address and other HTTP headers. This is normal browser behavior.
Search engine bots like Googlebot identify themselves through User-Agent strings so website owners can recognize crawler traffic and serve appropriate content. Some bots respect robots.txt directives based on their User-Agent.
User-Agent strings can be spoofed or modified by browsers and extensions. Many browsers also share similar patterns (Chrome-based browsers share Chromium's UA). For critical functionality, server-side feature detection is more reliable.