User-Agent パーサー
「User-Agent パーサー」はコード、データと QRに使えるブラウザツールです。入力内容と結果は通常この端末内で処理され、登録は必要ありません。
使い方
使い方
- Paste a user-agent string or use the included example.
- Parse the value and review the broad classifications alongside the unchanged raw input.
- Use the result as a hint for diagnostics, not as a security or identity signal.
Readable broad classifications
The result reports a likely browser family and version, operating-system family and version, and broad device class such as desktop, phone, or tablet. Unknown values remain Unknown rather than being guessed from a remote database.
Raw input stays visible
The exact user-agent string is shown with the parsed result so you can compare the classification with the source value. Parsing happens in this browser and the input is never uploaded.
A hint, not identity or security
User-agent strings can be shortened, spoofed, frozen, or changed by browsers and embedded webviews. Do not use this parser for authentication, fraud decisions, capability detection, or precise hardware identification; feature detection is safer for web behavior.
よくある質問
あわせて知りたいこと
Does this send my user-agent to a server?
No. Pattern matching and display run locally in your browser.
Can it identify every browser and device?
No. It covers common browser and operating-system tokens and deliberately returns Unknown when the string does not provide enough evidence.
Is the result reliable for security decisions?
No. User-agent strings are client-controlled and can be spoofed. Use server-side security controls and actual feature detection where appropriate.