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User Agent Parser

Inspect and parse user agent headers to detect host browser, OS version, engine, and devices.

Interactive Online Utility

User Agent Parser runs 100% locally in your browser sandbox with zero network roundtrips. Load or paste your code directly into the workspace above to format, parse, validate, or generate your output instantly. 

Paste User Agent string here, or click Parse to detect your browser.
PRO TIP Local Client-Side Processing

Otuls runs 100% locally in your browser. Your data is processed in-memory and never transmitted over external network connections.

Technical Guide & Overview

User Agent Parser is a dedicated developer utility designed to streamline common workflow tasks with zero installation, instant execution, and complete data privacy.

How It Works Under the Hood

The tool leverages modern browser standards (HTML5, WebAssembly, WebGL, and modern ECMAScript) to execute complex computations directly on your local device CPU and GPU without offloading processing to third-party cloud servers.

Authoritative Specifications & Primary Standards

Official specifications, RFCs, and authoritative open-source repositories for User Agent Parser:

IETF RFC

Internet standard defining User-Agent header syntax, product tokens, and comments.

GitHub Repository

The definitive open-source regex engine for detecting OS, browser, engine, and device.

Zero-Knowledge Client-Side Sandboxing

Privacy First: This tool operates completely inside your browser with zero remote logging or tracking.