Parse User-Agent strings from HTTP request headers to extract detailed technical information, including browser, operating system, and device type.
Enter UserAgent to start parsing

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Struggling to quickly identify a user's browser version, operating system, or device type from a messy User-Agent string? This tool is designed specifically to solve this pain point. It automatically parses the User-Agent string from HTTP request headers and breaks it down into structured key fields such as browser information, operating system details, and device type. The User-Agent is a part of the HTTP protocol, sent by the client (like a browser or crawler) to the server to identify its software environment. By parsing this specifically formatted string, our tool helps you quickly understand the technical background of your visitors.
Q: How accurate is the User Agent parsing?
A: The tool parses based on public User-Agent rule libraries, providing accurate identification for mainstream browsers and operating system versions. However, for highly customized, spoofed, or unconventional UA strings, the parsed results may have deviations or missing fields.
Q: Can a User-Agent retrieve IP and screen information?
A: No. The User-Agent string itself only contains software and hardware environment identifiers (such as browser, OS, and device type). It does not contain privacy or real-time information like IP addresses, screen resolutions, or geographic locations. That information must be obtained through other technical means.
Please ensure the User-Agent string you input is complete and correctly formatted; otherwise, it may affect the parsing results. The parsed results are for reference only. For critical scenarios like device compatibility testing, we recommend verifying with real devices. This tool does not store or upload the strings you enter, but please avoid pasting UAs containing sensitive internal identifiers in public. The tool does not support batch parsing or file uploads; it processes only one string at a time.
For web developers and data analysts, User-Agent parsing is foundational for device compatibility adaptation, traffic source analysis, and formulating anti-crawler strategies. A typical use case is: when website logs show abnormal traffic to a certain page, you can extract the corresponding User-Agent and parse it to determine if it comes from a specific crawler program (like a search engine spider). Please note that modern browser privacy modes or certain extensions may simplify or modify the User-Agent, causing the parsed device information to not perfectly match reality. For example, when the mobile Chrome browser uses "Request Desktop Site," its UA will include desktop system identifiers, making the parsed "device type" inaccurate. Therefore, when relying on UAs for critical business decisions, it is recommended to use them as a reference metric rather than the sole basis.