User-Agent Parser

What Is a User-Agent String?

A User-Agent (UA) string is a text header that web browsers and other HTTP clients send to web servers to identify themselves. It typically contains information about the browser name and version, operating system, device type, and rendering engine. For example, a Chrome UA string reveals the browser version, the underlying OS (Windows, macOS, Linux, Android, iOS), and whether the device is a desktop, mobile, or tablet. This parser extracts and displays all available information from any User-Agent string. Developers use it for analytics processing (identifying visitor devices and browsers), debugging (verifying correct UA detection), bot detection (identifying crawlers and scrapers), and content negotiation (delivering optimized content based on device capabilities).

How to Use This Tool

1. Paste a User-Agent string — Enter or paste any User-Agent string into the input area.
2. Click Parse — The tool analyzes the string and extracts browser, OS, device, and engine information.
3. Review the results — Parsed details are displayed in a structured card showing device type, engine, browser name, browser version, OS name, OS version, and CPU architecture.
4. Use examples — Click the example buttons (Chrome, Firefox, Safari, Bot, Mobile) to see parsed results for different user agents.
5. Identify bots — Bots and crawlers are flagged with a red BOT badge for quick identification.

Frequently Asked Questions