User Agent Parser
Parse User-Agent strings to extract detailed browser family, version, operating system, and device type.
Quick Answer & Understanding Your Result
A User Agent Parser breaks down HTTP `User-Agent` header strings into structured client metadata: Browser Name & Version, Operating System, Rendering Engine, CPU Architecture, and Device Type (Desktop, Mobile, Tablet, Bot).
Extracted Client Telemetry Fields
- Browser Family & Major/Minor Version: Detects Chrome, Safari, Firefox, Edge, Opera, Samsung Internet, and embedded webviews.
- Operating System & Architecture: Identifies Windows 11, macOS, iOS, Android, Linux, Ubuntu, and CPU architecture (x86_64, ARM64).
- Device Model & Form Factor: Determines Mobile, Tablet, Desktop, or Web Crawler Bot (Googlebot, Bingbot, GPTBot).
Analytics & Security Applications
- Bot Detection & Traffic Scrubbing: Identifying search engine crawlers and automated scraper bots in access logs.
- Web Analytics Telemetry: Grouping user traffic sessions by device form factors and browser capabilities.
Enter any User-Agent header string above to inspect structured client metadata and JSON diagnostics instantly.
Formula & Calculation Logic
Technical Specification & ASTApplies lexical pattern matching and token extraction across browser engines, operating systems, and bot identifiers in 0ms.
Step-by-Step Guide
Paste User-Agent String
Paste raw User-Agent header string from server access logs, curl requests, or web inspector.
Deterministic Token Parsing
The engine parses browser, OS, hardware, and bot tokens in 0ms.
Review Structured Telemetry
Inspect clean formatted JSON and overview summary cards of client device specifications.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Chrome on macOS Desktop | Identifies Apple Mac hardware running modern Chrome browser. | ||
| Googlebot Web Crawler | Detects official Google search engine indexer. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
W3C User-Agent Client Hints Specification
MDN Web Docs - User-Agent HTTP Header
Google Search Central: Overview of Google Crawlers (User Agents)
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: Client Info = UAParser(UserAgentHeaderString)
Last Reviewed: August 21, 2026
Primary Source: W3C User-Agent Client Hints Specification
Reference Document: MDN Web Docs - User-Agent HTTP Header
Computation Privacy: 100% client-side 0ms computation, zero data retention
All algorithms, formatters, and data conversions run 100% locally in your browser following official technical standards (RFC, ISO, W3C). Output should be verified prior to mission-critical production deployment.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.