User Agent Checker

See exactly what your browser reveals about you. This checker reads your user-agent string plus your platform, language, screen size, viewport and timezone — the same details every website you visit can detect.

User Agent Checker
Click the button to read your browser's user agent and environment.

What the User Agent Checker does

Your user agent is a text string your browser sends with every request, identifying the browser, its version, and the operating system it runs on. Websites use it to serve compatible pages, gather analytics, and sometimes to tailor content to your device.

This tool reads that string directly in your browser and pairs it with related environment details — platform, language, screen and viewport size, timezone, and connection status — so you can see the full fingerprint a site can collect. Everything is read locally; nothing is sent to our servers.

How to read the results

  • User Agent — the full identification string (browser, engine, version, OS).
  • Platform / Language — your OS family and preferred language.
  • Screen / Viewport — your display resolution and the visible page area.
  • Timezone — your local timezone as reported by the browser.

Worked example

Input: (reads your own browser)

User Agent    Mozilla/5.0 (Windows NT 10.0; Win64; x64) …
Platform      Win32
Language      en-US
Timezone      America/New_York

Modern browsers deliberately keep the user-agent string generic to reduce fingerprinting, but combined with screen size, language and timezone it still helps sites recognise your setup.

Common use cases

  • Confirm which browser and version you're actually running.
  • Grab your exact user-agent string for a bug report or support ticket.
  • Test how a site detects device type or language.
  • Understand the fingerprint data websites can read from your browser.

User Agent Checker — Frequently Asked Questions

What is a user-agent string?▾

It's a line of text your browser includes in every HTTP request that names the browser, its rendering engine and version, and your operating system. Servers read it to decide how to serve content and to compile analytics.

Can I change or hide my user agent?▾

Yes. Browser developer tools and certain extensions let you spoof the user-agent string, and privacy-focused browsers deliberately generalise it. Doing so can occasionally break sites that rely on it for feature detection.

Is this information sent to your servers?▾

No. The user-agent checker reads everything with client-side JavaScript in your own browser and displays it to you. None of it is transmitted to or stored by us — consistent with our no-logging privacy policy.

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