100% In-Browser Privacy

User Agent Parser

Developer Tools

Parse and decode User-Agent strings to identify browser name, browser version, operating system, device model, CPU architecture, and bot status.

100% In-Browser Privacy

Zero Server Uploads

User Agent String

Browser

Unknown Browser

vUnknown

Operating System

Unknown OS

Platform

Device Type

Desktop

Form Factor

Rendering Engine

Unknown Engine

Core Engine

Who Is User Agent Parser Built For?

Web developers debugging browser compatibility issues and device-specific styling bugs

Security analysts investigating server access logs and suspicious web crawler requests

QA engineers validating device detection headers across mobile and desktop test devices

Key Benefits & Core Capabilities

Auto-Detects Your Current User-Agent

Instantly inspects and breaks down your own active browser’s user-agent header on page load.

Detailed Component Breakdown

Extracts Browser, Engine (Blink, Gecko, WebKit), OS, Device Type (Mobile, Tablet, Desktop), and CPU.

Bot & Crawler Detection

Identifies search engine crawlers (Googlebot, Bingbot, Baiduspider) and automated scraper agents.

100% In-Browser Parsing

Parse private server access log strings locally with complete data confidentiality.

Step-by-Step Guide: How to Use User Agent Parser

1
View or Paste UAYour current browser UA is auto-detected, or paste any custom header string.
2
AnalyzeThe parser extracts browser name, version, OS, architecture, and rendering engine.
3
ExportCopy individual fields or export structured JSON metadata.

How It Works & Technical Architecture

Web browsers and HTTP clients send a User-Agent header containing device, platform, and rendering engine tokens with every web request.

The Softnag User Agent Parser matches the input string against comprehensive regex pattern dictionaries in client JavaScript.

It extracts structured attributes (such as Chrome 124 on macOS Sonoma x86_64) and renders them in clean visual cards with zero cloud communication.

Practical Use Cases & Applications

Debugging Server Access Logs

Paste user-agent strings from Nginx, Apache, or Cloudflare logs to identify client devices.

Validating Device Emulation

Verify that custom user-agent headers configured in test runners like Playwright or Puppeteer parse correctly.

Bot Traffic Identification

Distinguish legitimate search engine bots from suspicious automated scraping tools.

Troubleshooting Mobile Rendering Bugs

Identify specific mobile browser versions reporting layout errors on your web app.

Supported Formats & Input Options

Raw User-Agent StringCurrent Browser UA (Auto-detected)Mobile / Bot / Desktop Headers

Frequently Asked Questions

What is a User-Agent string?

A User-Agent is a text string sent by your web browser in HTTP request headers that identifies the browser, operating system, and rendering engine to web servers.

Can this tool parse mobile and tablet user agents?

Yes. Softnag identifies iOS (iPhone/iPad), Android, Windows, macOS, Linux, ChromeOS, and specific device models.

Can it detect search engine bots like Googlebot?

Yes. It recognizes Googlebot, Bingbot, Yandex, DuckDuckBot, Baidu, and social media scrapers (Twitterbot, FacebookExternalHit).

Are parsed user-agent strings stored or logged on your servers?

No. The parser runs 100% locally in your browser memory.

Can I copy the parsed data as JSON?

Yes. You can copy the parsed device attributes as formatted JSON with one click.

What is a User-Agent header?

A User-Agent header is a string sent by web browsers and HTTP clients to web servers to identify the client application, operating system, and hardware architecture.