User-Agent & Device Inspector
Parse and inspect HTTP User-Agent headers, identify browser engines, operating systems, hardware architectures, and search engine crawler bots. 100% private in-browser tool.
Version: Unknown
Arch: Unknown
Standard Client Device
vUnknown
Anatomy of an HTTP User-Agent Header
| Component Segment | Sample String | Technical Meaning |
|---|---|---|
| Compatibility Identifier | Mozilla/5.0 | Historical compatibility standard indicator |
| Platform Token | (Windows NT 10.0; Win64; x64) | Operating system version and CPU architecture |
| Engine Token | AppleWebKit/537.36 | HTML rendering and layout core |
| Browser Vendor Token | Chrome/128.0.0.0 Safari/537.36 | Primary application name and release number |
Major Web Crawler & Search Bot User-Agent Signatures
| Crawler Name | Organization | Key User-Agent Substring |
|---|---|---|
| Googlebot | Google Search | Googlebot/2.1 |
| Bingbot | Microsoft Bing | bingbot/2.0 |
| Twitterbot | X / Twitter Link Preview | Twitterbot/1.0 |
How to Inspect User-Agent Headers Online
- Auto-Detect Device: Click "Detect My Device" to inspect your current browser and operating system specs.
- Or Paste Custom Header: Copy any User-Agent string from server access logs or analytics reports.
- Inspect Results: Review the extracted browser, operating system release, engine, CPU architecture, and bot flags.
Frequently Asked Questions
100% In-Browser Privacy
All User-Agent header parsing and engine classification execute locally in your web browser. No device fingerprinting or logs are sent to any remote server.
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