User Agent Parser — A user-agent string is the little blurb of text your browser sends to every website to identify itself. It looks like noise, but inside it tells you which browser, which version, which operating system, and which device type made the request. Parsing it is essential for analytics, browser-specific bug reports, and bot detection.
Parsing happens in your browser. Your UA string is not sent anywhere.
Was User Agent Parser useful?
User Agent Parser是什么？
A user-agent string is the little blurb of text your browser sends to every website to identify itself. It looks like noise, but inside it tells you which browser, which version, which operating system, and which device type made the request. Parsing it is essential for analytics, browser-specific bug reports, and bot detection.
Paste a UA string and get a clean breakdown: browser + version, OS + version, device type (mobile / tablet / desktop / bot), and a bot flag. The "What is my UA" button fills the field with your own browser's UA so you can see it parsed live.
使用方法
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Paste a UA string
From server logs, browser dev tools, or an HTTP header.
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Or click "Use my UA"
Fills the field with your own browser's UA string.
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Read the breakdown
Browser, version, OS, device, and bot flag appear below.
示例
Chrome on Windows
The classic desktop Chrome UA.
结果： Browser: Chrome 120 · OS: Windows 10 · Device: desktop
Googlebot
The Google web crawler.
结果： Browser: Unknown · OS: Unknown · Device: bot · Bot: true
常见问题
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Last reviewed: 2026-09-25