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User Agent Parser & Tester

Client-SideOffline ReadyDev ToolsNo login required

Detect browser version, operating system, layout engine, hardware architecture, and search engine / AI crawler signatures from User-Agent strings.

Test Device & Crawler Presets:

User-Agent String

0 characters
Browser
Unknown Browser
Version: Unknown
Operating System
Unknown OS
Release: Standard
Device Form
Desktop
Model: Standard Machine
Layout Engine
Unknown
Classification: Interactive User

Parsed JSON Output

{
  "raw": "",
  "browser": {
    "name": "Unknown Browser",
    "version": "Unknown",
    "major": "Unknown"
  },
  "os": {
    "name": "Unknown OS",
    "version": ""
  },
  "device": {
    "type": "Desktop"
  },
  "engine": {
    "name": "Unknown"
  },
  "isBot": false
}

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Bot & Crawler Classifier

Identifies search engine spiders and AI scrapers including Googlebot, Bingbot, Applebot, Twitterbot, and GPTBot.

100% Client-Side Parsing

Processes strings completely inside your browser memory. No device telemetry or browsing data is logged.

Frequently Asked Questions

What information does a User-Agent header reveal?
A User-Agent header identifies the browser engine (Blink, WebKit, Gecko), operating system version, device architecture, and whether the visitor is an automated web spider or human user.
Does this tool detect AI scrapers like GPTBot and ClaudeBot?
Yes. The built-in bot classifier detects search engine crawlers (Googlebot, Bingbot) and AI indexing bots (GPTBot, ChatGPT-User, ClaudeBot) based on their official RFC user-agent tokens.
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