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User Agent Parser

Decode any User-Agent string into browser, engine, operating system and device — and find out whether it belongs to a search engine, AI crawler or script.

Actualizado el
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Browser
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Operating system
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Device type
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Rendering engine
Details
Browser
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JSON
{}

Tus datos nunca salen de tu ordenador. Todo se procesa localmente en tu navegador.

Cómo usar: User Agent Parser

  1. Your own user agent is loaded automatically. To analyze another one, paste it into the box — e.g. from a server log or analytics export.
  2. Or pick an entry from Load a sample to see how Googlebot, GPTBot, an iPhone or a smart TV identify themselves.
  3. Read the browser, OS, device type and engine in the summary cards; the details panel adds versions, vendor, model and CPU architecture.
  4. If the string belongs to a crawler, a banner names the bot and its operator. Copy the JSON result to use it in your code or tickets.

What is a user agent string?

A user agent (UA) string is the text a browser or HTTP client sends in the User-Agent request header to identify itself. Servers use it for analytics, bug workarounds, bot management and serving the right download. A typical Chrome on Windows string looks like this:

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

It is full of historical baggage: every browser claims to be “Mozilla/5.0”, Chrome mentions Safari and Gecko, and Edge adds Edg/ to Chrome’s string. That’s why reliable parsing has to check tokens in the right order — Edge before Chrome, Chrome before Safari.

How this parser works

  • Bots first: dozens of crawler tokens are matched — search engines (Googlebot, Bingbot, YandexBot, Applebot), AI crawlers (GPTBot, OAI-SearchBot, ClaudeBot, PerplexityBot, CCBot, Bytespider), social previews (facebookexternalhit, Twitterbot, Slackbot), SEO tools and HTTP libraries (curl, python-requests, Go-http-client).
  • Browser: specific browsers (Edge, Opera, Samsung Internet, Vivaldi, Yandex, in-app browsers) are checked before the generic Chrome, Firefox and Safari tokens.
  • Engine: Blink for Chromium browsers, Gecko for Firefox, WebKit for Safari — and for every browser on iOS, because Apple requires WebKit there (outside the EU).
  • OS & device: Windows NT versions are mapped to names, iOS/Android versions are extracted, and the device type comes from tokens like Mobile, iPad or SMART-TV.

Limits of user agent detection

Browsers now “freeze” parts of the string for privacy. Chrome reports minor versions as .0.0.0, Android Chrome sends Android 10; K instead of the real version and model, Windows 11 still says Windows NT 10.0, and Safari reports macOS as 10_15_7. Accurate values are only available through User-Agent Client Hints (Sec-CH-UA-* headers or navigator.userAgentData), which this tool also reads for your own browser. And any client can send any string, so never use the UA for security decisions.

Verifying real Googlebot traffic

Scrapers often pretend to be Googlebot. To verify, do a reverse DNS lookup of the visitor’s IP (it should end in googlebot.com, google.com or googleusercontent.com) and then a forward lookup of that hostname, which must return the same IP. You can run both with our DNS Lookup. To check which AI crawlers your robots.txt allows, use the AI Crawler Checker.

También se busca como: user agent, ua parser, user agent string, what is my user agent, browser detection, bot detection, googlebot user agent, gptbot.

Herramientas que combinan con: User Agent Parser

  • ¿Cuál es mi IP? — Tu dirección IP pública y toda la información que tu navegador revela a las páginas web que visitas: agente de usuario, resolución de pantalla, idioma, zona horaria y encabezados de solicitud.
  • Robots.txt Tester — Check whether a URL is allowed or blocked for Googlebot, Bingbot, GPTBot and other crawlers, see exactly which rule matched, and edit the file to test changes before you deploy them.
  • HTTP Header Checker — Fetch any URL and see exactly what the server sends back — status code, redirect chain and every response header, with a plain-English explanation of the ones that matter for SEO, caching and security.
  • Email Header Analyzer — Paste the raw headers of an email to see its whole journey: every server hop with the time it took, the SPF, DKIM and DMARC results, the originating IP, and warning signs like a mismatched Reply-To or Return-Path.

Preguntas frecuentes

What is my user agent?
It is loaded into the box automatically when you open this page. Click Use my user agent to reload it after editing the field.
Why does Chrome’s user agent mention Safari and Mozilla?
For compatibility. Early websites served advanced features only to “Mozilla” browsers, so every browser copied the token; Chrome later inherited “AppleWebKit … Safari” from its WebKit roots. Sites that sniff UAs would break if these tokens were removed.
Can I detect Windows 11 from the user agent?
No. Windows 10 and 11 both send Windows NT 10.0. Use the Sec-CH-UA-Platform-Version client hint instead — values of 13 or higher mean Windows 11.
How do I identify AI crawlers like GPTBot or ClaudeBot?
Their user agents contain tokens such as GPTBot, OAI-SearchBot, ChatGPT-User, ClaudeBot, PerplexityBot or CCBot. Paste a log line here to identify it, and control their access in robots.txt.
Should I use the user agent for feature detection?
No — check for the feature itself (e.g. 'share' in navigator or CSS @supports). UA sniffing breaks when browsers update or spoof strings; use it for analytics and bot handling only.
¿Puedo instalar User Agent Parser como aplicación web y utilizarla sin conexión?
Sí. User Agent Parser es una aplicación web instalable (PWA): se instala desde el navegador, no se descarga desde una tienda de aplicaciones. Haz clic en «Instalar aplicación» en la parte superior de esta página en Chrome o Edge (Windows, macOS, Linux, ChromeOS) o, en Android, utiliza «Compartir» → «Añadir a la pantalla de inicio» en iPhone y iPad, o «Archivo» → «Añadir al Dock» en Safari 17+ en un Mac. A continuación, se abrirá en su propia ventana con su propio icono y, como se ejecuta íntegramente en tu navegador, seguirá funcionando sin conexión. Firefox en el ordenador de sobremesa no permite instalar aplicaciones web. Cómo funciona la instalación.

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