User agent parser

Your browser's user agent is parsed below. Paste any other User-Agent string — from server logs, analytics or a bug report — to see the browser, rendering engine, operating system and device it describes.

How to parse a user agent string

1. The tool loads your own user agent automatically; paste another one to replace it, or pick a sample.
2. Read the summary line, then the browser, engine, OS and device details. Bots and HTTP libraries are flagged.
3. Check the notes: they tell you when a value is frozen (macOS 10.15.7, Windows NT 10.0, Android "K") and can't be trusted.

Reading a user agent string

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36 Edg/141.0.0.0

• Mozilla/5.0 — a historical token every browser sends for compatibility. It means nothing today.
• (Windows NT 10.0; Win64; x64) — platform: OS, version and CPU architecture.
• AppleWebKit/537.36 (KHTML, like Gecko) — engine tokens. Blink still claims WebKit 537.36 for compatibility.
• Chrome/141.0.0.0 Safari/537.36 — Chromium-based browsers include both; real Safari has Version/x Safari/y instead.
• Edg/141.0.0.0 — the actual browser. Edge, Opera (OPR/) and Samsung Internet add their own token at the end, which is why parsers check them before Chrome.

User-Agent Client Hints

Chromium browsers now send only low-entropy hints by default: Sec-CH-UA (brands), Sec-CH-UA-Mobile and Sec-CH-UA-Platform. A server can request more — model, platform version, full version list, architecture — by replying with Accept-CH, and pages can read them with navigator.userAgentData.getHighEntropyValues(). Safari and Firefox don't implement Client Hints, so keep a user-agent fallback.

Gotchas when detecting devices

• Since iPadOS 13, iPads send a desktop Mac user agent. Check navigator.maxTouchPoints > 1 to tell them apart.
• All iOS browsers use WebKit, so Chrome on iOS (CriOS) behaves like Safari for rendering bugs.
• Android phones include Mobile in the UA; Android tablets usually don't.
• For features, use feature detection ('share' in navigator, CSS.supports()) instead of the UA.

Related tools

• HTTP headers reference
• cURL converter
• HTTP status codes — full list
• Webhook tester — inspect incoming requests