The HTTP Referer header is automatically sent by browsers whenever you click a link. It tells the destination website which page you came from — potentially exposing your domain, URL structure, or user behavior to third parties you don't control.

Webmasters use referrer hiding to prevent their domain from appearing in competitor analytics, to protect affiliate links, to avoid leaking internal URL structures, and to keep user browsing behavior private when linking to external sites.

Adding rel="noreferrer" to an anchor tag instructs the browser to omit the Referer header for that navigation and implicitly sets noopener, preventing the opened tab from accessing the opener window. NoReferrer applies this attribute plus six additional techniques at the same time.

Yes — completely. NoReferrer runs entirely in your browser as a static page. No URLs are stored, logged, or transmitted to any server. Your destination URLs stay 100% private on your device.