User Agent Parser — Browser, OS and Device Detection
Parse any User-Agent string to detect browser, OS, device type, and engine. Auto-detects your current browser UA on load.
All parsing runs in your browser. Your User-Agent is never sent to any server.
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Frequently Asked Questions
Quick answers to common questions
What information does a User-Agent string contain?+
A User-Agent string typically contains: browser name and version, rendering engine, operating system and version, device type hints, and sometimes app or bot identifiers.
Why do all browsers include 'Mozilla/5.0' in their UA?+
This is a legacy compatibility artifact from the 1990s when servers gatekept features by detecting Netscape (Mozilla). Other browsers added Mozilla/5.0 to receive full-featured pages.
How do I detect bots and crawlers from User-Agent?+
Common bot indicators: 'bot', 'crawl', 'spider', 'Googlebot', 'Bingbot', 'facebookexternalhit'. This parser highlights known bot signatures.