用户代理检查器

您的用户代理字符串透露有关浏览器、操作系统和设备的信息。确切查看网站可以检测到关于您的什么信息。

您的用户代理字符串

解析信息

浏览器功能

HTTP 头（客户端）

这些头部通常由您的浏览器随每个请求发送。有些只能在服务器端检测。

什么是用户代理？

A User-Agent string is an HTTP header that your browser sends to every website you visit. It identifies your browser type, version, operating system, and other technical details about your device.

网站为什么使用用户代理

• 内容适配： Serve mobile-optimized pages to mobile devices.
• 浏览器兼容性： Adjust features or styling based on browser capabilities.
• 分析： Track which browsers and devices visitors use.
• 安全： Block or warn users of unsupported browsers with known vulnerabilities.

隐私问题

Your User-Agent contributes to your 浏览器指纹. Combined with other attributes like screen resolution, installed fonts, and timezone, it can help identify you uniquely across websites — even without cookies.

这个工具如何工作？

This tool reads your browser's User-Agent string directly from the navigator.userAgent property — no server requests are needed. It then parses the string to extract structured information about your browser, operating system, and device. Additionally, it tests several browser capabilities (JavaScript, cookies, WebGL, etc.) and displays relevant HTTP headers available from the client side.

为什么要检查您的用户代理？

• 调试： Verify what User-Agent your browser is sending to websites.
• 隐私： Understand how much information your browser leaks about your device.
• 兼容性测试： Ensure your User-Agent is correctly formatted for web development.
• 安全： Check if your browser is identifying itself with an outdated or unusual string that could cause issues.

如何更改用户代理

• 浏览器开发者工具： Most browsers allow you to override the User-Agent in developer tools (F12 → Network conditions).
• 浏览器扩展： Extensions like "User-Agent Switcher" let you set custom UA strings.
• Tor 浏览器： Standardizes the User-Agent for all Tor users, making you blend in.
• Firefox 设置： You can modify general.useragent.override in about:config.