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Tools/User Agent Checker

User Agent Checker

Inspect your browser's user agent string and see how websites identify your browser, operating system, and device. Parse any custom UA string.

Parse a Custom User Agent

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Why Does the User Agent Matter?

The User-Agent header is sent automatically by your browser with every HTTP request. Websites use it for content negotiation (serving mobile vs desktop layouts), analytics, bot detection, and browser-specific feature flags. Anti-bot systems cross-reference the UA string against other signals like TLS fingerprints, canvas hashes, and WebGL fingerprints to detect spoofing.

Common User Agent Formats

Chrome on Windows

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Firefox on Linux

Mozilla/5.0 (X11; Linux x86_64; rv:124.0) Gecko/20100101 Firefox/124.0

Safari on iPhone

Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Mobile/15E148 Safari/604.1

Googlebot

Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)

Python Requests

python-requests/2.31.0

Frequently Asked Questions

What is a user agent string?›
A user agent (UA) string is a text identifier your browser sends with every HTTP request. It tells servers what browser, rendering engine, operating system, and device type you're using — so they can serve appropriate content.
Can I change my user agent?›
Yes. Browsers offer developer tools to override the UA string. Extensions like "User-Agent Switcher" automate this. Scraping frameworks let you set custom UA strings per request.
What is a bot user agent?›
Bots (crawlers, scrapers, monitoring tools) use UA strings that identify them — like "Googlebot", "curl/7.x", or "python-requests/2.x". Websites use these to serve crawl-friendly responses or block unwanted automation.
Does using a proxy change my user agent?›
No — proxies forward your HTTP traffic but do not modify the User-Agent header. Your browser's UA string is sent as-is through the proxy. You need a separate tool or extension to change it.
What are sec-ch-ua headers?›
These are Client Hints — a modern alternative to parsing UA strings. They're sent by Chromium-based browsers and tell servers the browser brand, version, and whether the device is mobile. They're more reliable than parsing the full UA string.