What is a User-Agent string?

A User-Agent is a header your browser sends on every request identifying itself: browser name and version, rendering engine, operating system, and device family.

Is parsing done in the browser?

Yes. The User-Agent and any headers you paste are analyzed locally — nothing is uploaded to a server.

User-Agent & HTTP Header Parser

Paste any User-Agent string to identify the browser, engine, operating system, and device — or paste raw HTTP headers to see them in a clean table. Everything stays in your browser.

User-Agent string

Characters: 111

Browser

Safari

v537.36

Engine

WebKit

v537.36

Operating system

Windows

10 / 11

Device

Desktop / Laptop

—

Desktop

Frequently asked questions

Why does the User-Agent look complicated?

Browsers keep old tokens for backward compatibility. The important parts are the product tokens near the end — this tool reads those to identify the real browser and engine.

Can User-Agents be spoofed?

Yes. Use this tool to understand and debug, but never rely on a User-Agent alone for security decisions — combine it with feature detection and your logs.

Is my data uploaded?

No. Both parsers run entirely in your browser, so you can safely paste full request dumps including headers you would not want to share.

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Runs in your browser — nothing is uploaded.