Can User-Agent strings be spoofed by clients?

Yes! HTTP headers are client-controlled and can be easily modified using browser extensions, curl, or automated scraping scripts.

Web Developer Tools

User Agent Parser & Inspector

Parse client User-Agent strings into browser, operating system, rendering engine, and device details.

Web Developer Tools

User Agent Parser & Inspector

Parse client User-Agent strings into browser, operating system, and engine details.

User Agent String

BrowserUnknown Browser

Operating SystemUnknown OS

EngineUnknown Engine

About User Agent Parser & Inspector

The User-Agent (UA) String Parser & Client Inspector analyzes HTTP `User-Agent` strings and Client Hints, identifying Browser Name and Version, Operating System, Device Model, CPU Architecture, and Web Rendering Engine.

Step-by-Step Guide

How to Use User Agent Parser & Inspector

Step 1

Click "Detect Current Browser" or paste any custom User-Agent string.

Step 2

Review the categorized breakdown: Browser, OS, Device, Engine, and Bot status.

Step 3

Click "Copy JSON" to export structured data.

Industry Scenarios

Practical Use Cases for User Agent Parser & Inspector

Web Analytics & Server Access Log Debugging

Parse raw User-Agent headers from NGINX access logs to identify client browser versions, search engine bots, and mobile devices.

Browser Compatibility & Feature Detection QA

Inspect your own current browser User-Agent string to diagnose cross-browser rendering inconsistencies.

Sample Data & Transformation

Input & Output Examples

Parsing Chrome on macOS User-Agent

Input Sample:

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Processed Result:

Browser: Chrome 128.0 | OS: macOS 10.15.7 | Device: Desktop | Engine: Blink (WebKit 537.36)

Technical Capabilities

Key Features & Performance

✓1-Click "Detect My Current User-Agent" inspects your active browser environment.
✓Extracts Browser Name, Version, OS, OS Version, Device Type (Desktop, Mobile, Tablet, Bot), and Layout Engine (Blink, Gecko, WebKit).
✓Identifies search engine crawlers and AI bots (Googlebot, Bingbot, GPTBot).
✓100% Client-Side execution.
✓1-Click Copy parsed user-agent JSON.

Technical Glossary

Key Terminology & Definitions

User-Agent (UA) Header

An HTTP request header sent by web browsers identifying the software, version, and operating system to the web server.

User-Agent Client Hints (UA-CH)

A modern privacy-preserving web standard providing structured client capabilities (brands, platform, architecture) via separate HTTP headers.

Frequently Asked Questions (PAA)

User Agent Parser & Inspector FAQs

Historical compatibility: early web browsers spoofed the Mozilla identifier so legacy web servers would send them modern HTML layouts rather than stripped-down pages.