User Agent Parser & Detector
Parse HTTP User-Agent strings instantly to identify web browser, OS, rendering engine, and device form factor.
Our free User Agent Parser and Detector enables developers, system administrators, and QA testers to parse any HTTP User-Agent string. Identify browser names, exact versions, operating systems, and device form factors in seconds.
Common Use Cases
- ✓Identify Browser & OS Version
Inspect your active web browser version, operating system release, and rendering engine details.
- ✓Debug Web Application Analytics
Parse server access logs or analytics payloads to identify incoming client devices and web crawlers.
- ✓Test Responsive User-Agent Switchers
Paste custom mobile or tablet User-Agent strings to verify device detection logic.
Key Features
Automatic Client Detection
Auto-detects your current browser's live HTTP User-Agent header on page load.
Detailed Field Breakdown
Parses browser name, version, OS, architecture, engine (Blink/WebKit/Gecko), and device type.
Bot & Crawler Detection
Identifies search engine bots like Googlebot, Bingbot, DuckDuckBot, and social media crawlers.
How to Use This Tool
- View Auto-Detected UA: Your current browser User-Agent string is parsed automatically.
- Paste Custom User-Agent: Optionally paste any HTTP User-Agent header from server logs into the input field.
- Inspect Parsed Cards: Review browser version, operating system, rendering engine, and device category cards.
- Copy String: Click Copy UA String to copy raw user-agent text to your clipboard.
Understanding HTTP User-Agent Strings
A User-Agent (UA) is a characteristic HTTP request header string that a web browser sends to web servers. It contains information about the application type, operating system, software vendor, or software version of the requesting client.
Web developers and security analysts use User-Agent parsers to analyze traffic logs, diagnose browser compatibility bugs, and enforce device-specific rendering.
Advanced Features and SEO Benefits
User-Agent Client Hints (UA-CH)
Modern Chromium browsers complement raw UA strings with Sec-CH-UA headers for privacy-preserving client detection.
Bot & Scraper Fingerprinting
Helps identify automated scraping bots, web crawlers, and legacy web clients.
Frequently Asked Questions
What is my current User Agent string?
Our tool automatically displays your current browser User-Agent string in the top input box as soon as you open the page.
Can I parse User-Agent strings from server logs?
Yes, paste any User-Agent string from Nginx, Apache, Cloudflare, or AWS logs to inspect device details.
Does User-Agent detection work for mobile devices?
Yes, it detects iOS, Android, iPadOS, Windows Mobile, and tablet form factors accurately.
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