Developer

User Agent Parser

Decode any User-Agent string into a clean breakdown — browser, engine, OS, device, and version — for log triage, bug reports, and analytics QA.

ツール要約

このツールは構造化された入力を受け取り、サーバーへアップロードせずにブラウザで決定的な出力を返します。

ツール名: User Agent Parser
入力の目的: 変換・検証・分析するソースコンテンツを入力してください。
出力の目的: コピー・再利用・デバッグに適した正規化された出力を受け取ります。
入力例: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Safari/605.1.15
出力例: browser: Safari 17.4 engine: WebKit 605.1.15 os: macOS 10.15.7 device: Desktop

User-Agent stringDrop file

Presets:

Browser

Safari

17.4

Engine

WebKit

605.1.15

Operating system

macOS

10.15.7

Device

Desktop

—

JSON view

Parsed JSONRead-only

{
  "browser": {
    "name": "Safari",
    "version": "17.4"
  },
  "engine": {
    "name": "WebKit",
    "version": "605.1.15"
  },
  "os": {
    "name": "macOS",
    "version": "10.15.7"
  },
  "device": {
    "type": "Desktop",
    "model": "",
    "vendor": ""
  },
  "isBot": false
}

ツールの紹介

Decode any User-Agent string into a clean breakdown — browser, engine, OS, device, and version — for log triage, bug reports, and analytics QA.

ツール概要

The User-Agent header is a historical mess: every browser claims to be Mozilla, lots of stacks lie about who they are, and important hints are hidden in trailing tokens. This parser uses a sequence of well-known signatures (in the right order) to identify the real browser and engine, then extracts the OS and the device type. It surfaces the parts that matter — browser, engine, OS, device, raw version — and flags ambiguous strings instead of guessing wildly. Great for triaging support tickets and validating server-side analytics.

ユースケース

Triage a bug report by extracting the user’s browser and OS from a noisy UA string.
Quickly validate analytics dashboards against raw logs.
Build a quick allow/deny list by inspecting the UA your real users send.

入力／出力の例

入力の目的

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Safari/605.1.15

出力の目的

browser: Safari 17.4
engine: WebKit 605.1.15
os: macOS 10.15.7
device: Desktop

よくある質問

How accurate is the detection?+

For mainstream browsers and operating systems, very accurate. For obscure or spoofed UAs the parser will still surface what it can find and flag the rest as Unknown.

Can it detect bots and crawlers?+

Yes — known crawlers (Googlebot, Bingbot, AhrefsBot, etc.) are recognized and labelled as bots so you can filter them out of analytics.

Is anything sent to a server?+

No. UA parsing happens entirely in your browser; nothing is uploaded.

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