This is the line your browser sends to every website you visit. Everything below is read in your own browser and nothing is sent anywhere.
Almost every browser's user agent starts with Mozilla/5.0, and Chrome's also mentions AppleWebKit, KHTML and Safari. That's history, not confusion: for decades browsers copied each other's strings so that servers checking for a rival wouldn't send them a stripped-down page. The result is a string that names four browsers and means one.
Modern Chrome also freezes parts of the string (a "reduced" user agent) and sends the real detail in separate Sec-CH-UA client-hint headers instead. That's why the version numbers above may look rounder than you expect.
Useful when you want to test how a site answers a different browser or a crawler. Click to copy.
Two ways, and they do different things:
User-Agent header sent to chosen sites, permanently, without DevTools open. Page JavaScript still sees your real browser.Full steps for both, with screenshots of where each option lives: how to change your user agent in Chrome.
A Chrome extension for setting request and response headers, with ready-made User-Agent presets (Chrome on Windows, iPhone Safari, Googlebot), one-click CORS, and rules that show whether they actually fired. Free, no analytics, no ads, no account.
Get HeaderForge for Chrome