The DNT (Do Not Track) request header indicates the user's tracking preference. It lets users indicate whether they would prefer privacy rather than personalized content.

Header type Request header
Forbidden header name yes


DNT: 0
DNT: 1


The user prefers to allow tracking on the target site.
The user prefers not to be tracked on the target site.


Reading Do Not Track status from JavaScript

The user's DNT preference can also be read from JavaScript using the Navigator.doNotTrack property:

navigator.doNotTrack; // "0" or "1"


Specification Status Comment
Tracking Preference Expression (DNT)
The definition of 'DNT Header Field for HTTP Requests' in that specification.
Obsolete Initial definition.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
DNTChrome Full support 23Edge Full support 12Firefox Full support 4IE Full support 9Opera Full support YesSafari No support 6 — 12.1WebView Android Full support YesChrome Android Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS No support ? — 12.2Samsung Internet Android Full support Yes


Full support  
Full support
No support  
No support

See also