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User-Agent Parser
Decode any user-agent string into browser, OS, engine and device — instantly, in your browser. We pre-filled yours below.
Browser
Chrome 131
Operating System
Windows 10/11
Rendering Engine
Blink
Device Type
Desktop
Is Bot
No
What is a user-agent string?
A user-agent (UA) is a header your browser or HTTP client sends with every request, describing the browser, version, operating system and rendering engine. Servers read it to deliver compatible content — and anti-bot systems read it to spot non-human clients. This parser breaks a UA string into its parts using the same patterns real servers use.
Why it matters for scraping
A missing or inconsistent user-agent is one of the fastest ways to get blocked. Sending a realistic UA that matches your other request fingerprints (TLS, headers, IP type) keeps automated traffic looking human. Pair a clean UA with residential proxies for a high success rate.
Frequently asked questions
What does this tool detect?
Browser and version, operating system and version, rendering engine, device type, and whether the UA looks like a bot.
Is it accurate?
UA parsing is heuristic — strings can be spoofed — but this tool follows the conventions used by mainstream browsers and servers.