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User Agent Parser

Decode any HTTP User-Agent string to extract structured information about the browser, operating system, device type, and layout engine. The tool auto-fills your current browser's User-Agent so you can inspect your own session instantly.

User Agent Parser

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A tool by Digital Checkmark

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How to Use This Tool

The input is pre-filled with your current browser's User-Agent string
Edit or replace it with any User-Agent you want to parse
Click "Parse User Agent" to see the breakdown of browser, OS, and device details

What is User Agent Parser?

The User-Agent (UA) string is an HTTP request header sent by every web browser, crawler, and HTTP client to identify itself to servers. It typically encodes the browser name and version, the rendering engine, the operating system and version, and device type (desktop, mobile, tablet). UA strings follow no strict standard and have accumulated decades of compatibility quirks — most modern browsers include "Mozilla/5.0" for historical reasons, and Chromium-based browsers include "Safari" in their UA to maximize compatibility. Parsing UA strings is used for analytics, bot detection, adaptive content delivery, and debugging browser-specific issues.

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