User Agent Parser

About User agent parser

The user agent parser reads a browser's identification string and reports the browser, its version and rendering engine, the operating system, the device type and whether the client looks like a bot. Edge, Opera, Samsung Internet, Vivaldi, DuckDuckGo and Yandex are recognized before Chrome, which their strings also mention. The input is pre-filled with your own browser's string, so you can see a result immediately or paste one from a log.

How to use it

1. Look at the User Agent String box, which already holds your current browser's string. Replace it with any string you want to inspect.
2. Click Parse User Agent.
3. Read the Browser, Operating System and Device cards, plus the yellow notice if the string looks like a crawler.
4. Use Copy JSON to take the parsed fields as a JSON object.

Edge on Windows

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 Edg/126.0.2592.87

Browser: Microsoft Edge 126.0, engine Blink. Operating system: Windows 10, platform Desktop. Device: type Desktop, brand and model Unknown. Bot: no.

When to use it

• Working out which browser and OS produced a bug report that only includes a raw string.
• Spotting crawler traffic in server logs by pasting a suspicious entry.
• Confirming what your own browser is announcing to websites.
• Sanity-checking the strings you plan to send from a scripted HTTP client or test suite.

Questions about User agent parser

Why does Windows 11 show up as Windows 10?

Both versions announce themselves as Windows NT 10.0 in the string, so the tool cannot tell them apart. Microsoft's newer client hints are needed to distinguish them, and they are not part of the string.

Why does a Mac always report 10.15.7?

Safari and Chrome froze the macOS version in the string years ago as a privacy measure. Chrome likewise shows only its major version followed by zeros, so exact builds are not recoverable.

How does the bot check work?

It looks for words such as bot, crawler, spider, slurp and search. Well-known crawlers such as Googlebot, Bingbot, DuckDuckBot, GPTBot and Lighthouse get their own names; anything else is labeled Bot/Crawler.

How are Edge, Opera and other Chromium browsers told apart from Chrome?

Their own tokens, such as Edg, OPR, SamsungBrowser, Vivaldi, DuckDuckGo and YaBrowser, are checked before the Chrome token. Firefox, and Chrome, Firefox and Edge on iOS (FxiOS, CriOS, EdgiOS), are recognized too.

Why does Chrome on an iPhone say WebKit?

Apple requires every iOS browser to use its WebKit engine, so Chrome, Firefox, Edge and Opera on an iPhone or iPad are reported with WebKit. iPhone strings are also classed as iOS rather than macOS.

Can it tell me the exact phone model?

For Android it reads the model from the string, such as Pixel 8. Chrome now often shows just K in that spot, and then the model stays Unknown. Brand detection covers a handful of makers.

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