Decode Messy User Agent Strings
Whenever you visit a website, your browser sends a User Agent (UA) string inside the HTTP headers. This string acts like a digital ID card, allowing servers to identify your exact web browser, operating system, and device type so they can serve optimized layouts or block malicious bots.
However, due to decades of complex "browser wars" and compatibility spoofing (like every modern browser pretending to be "Mozilla/5.0"), these strings have become highly convoluted and difficult for humans to read. Our User Agent Parser cuts through the noise, using intelligent regex patterns to instantly extract accurate client analytics.
How to Analyze a UA String
- 1Get the StringCopy a raw User Agent string from your server logs, Google Analytics, or error tracking software.
- 2Paste into ParserPaste the string into the left input panel. You can also click "Detect My Current Browser" to check your own device.
- 3Instant ExtractionThe tool instantly breaks down the string into human-readable data points: Browser, OS, Device, and Engine.
- 4Export DataClick "Copy as JSON" to export the parsed analytics for use in your API, database, or bug report.
What Data is Extracted?
- Browser Name & VersionDetects Chrome, Firefox, Safari, Edge, Opera, and Internet Explorer, alongside their specific version numbers.
- Operating System (OS)Identifies Windows, macOS, Linux, iOS, Android, and Chrome OS.
- Device Form FactorClassifies the source as a Desktop computer, Mobile phone, Tablet, or an automated Bot/Crawler.
- Rendering EngineDetects the underlying layout engine powering the browser (e.g., Blink, WebKit, Gecko, Trident).
Frequently Asked Questions
Common questions about browser detection, string spoofing, and analytics.
Why do all strings start with Mozilla/5.0?
In the 1990s, web servers checked if a browser was "Mozilla" to send it advanced layouts (frames). To avoid getting broken, basic text-only pages, competing browsers like Internet Explorer started spoofing their UAs to say they were "Mozilla compatible." This arms race resulted in almost every modern browser today starting their string with Mozilla/5.0 to guarantee standard page rendering.
Can a User Agent string be faked?
Yes, very easily. Because the User Agent is just a text string sent by the client, users can use browser extensions or DevTools to spoof it. Developers commonly do this to test how a website responds to a mobile device. Therefore, UA strings should not be relied upon as strict security mechanisms.
Why does Chrome's UA contain "Safari"?
Similar to the Mozilla situation, Apple built the WebKit engine (Safari) which servers began serving better pages to. When Google built Chrome, they used WebKit (initially), so they added "AppleWebKit" and "Safari" to their string to ensure compatibility. The parser looks for the Chrome/ flag specifically to differentiate them.
Is my data sent to your servers?
No. Our User Agent Parser executes entirely client-side using native JavaScript regular expressions within your web browser. Your data, IP address, and pasted logs are never uploaded to any external server.