User Agent Parser

User Agent Parser - Browser & OS Detection Tool

Analyze any user agent string to extract browser name, version, operating system, device type, and rendering engine.

Paste any browser User-Agent string into the text area—you can find your current one displayed at the top of the tool. Click parse, and the tool extracts detailed information including browser name, version, operating system, device type (desktop, mobile, tablet), and rendering engine. The parser handles User-Agent strings from all major browsers including Chrome, Firefox, Safari, Edge, and mobile browsers. Results are displayed in a structured format showing each identified component. Your current User-Agent is detected automatically for quick reference. All parsing happens in your browser using pattern matching and regular expressions.

Web developers debug browser-specific issues by analyzing User-Agent strings from bug reports. Analytics teams understand their audience by decoding User-Agent data from server logs. QA engineers verify that their testing tools correctly identify browser and OS combinations. Security researchers identify suspicious or spoofed User-Agents in traffic logs. Web scraping developers test how their tools appear to target servers. Support teams diagnose customer issues by asking them to paste their User-Agent string for environment identification.

Modern web development should avoid User-Agent sniffing for feature detection—use feature detection APIs instead. However, for analytics and logging, User-Agent parsing remains valuable. Be aware that User-Agents can be easily spoofed, so never rely on them for security decisions. Mobile browsers often include multiple identifiers (like "Mobile Safari" containing both "Safari" and "Chrome"). The User-Agent string format is not standardized, leading to complex parsing logic with many edge cases. Google Chrome and Edge include "Safari" in their UA strings due to historical compatibility reasons.

All processing happens directly in your browser. Your files never leave your device — no server uploads, no cloud storage, no data retention. The tool works offline once loaded, requires no registration, and is completely free with no usage limits.