Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Sec-CH-UA-Mobile user agent client hint request header indicates whether the browser is on a mobile device.
It can also be used by a desktop browser to indicate a preference for a "mobile" user experience.
Sec-CH-UA-Mobile is a low entropy hint.
Unless blocked by a user agent permission policy, it is sent by default, without the server opting in by sending
|Header type||Request header, Client hint|
|Forbidden header name||yes|
?1indicates that the user-agent prefers a mobile experience (true).
?0indicates that user-agent does not prefer a mobile experience (false).
Sec-CH-UA-Mobile is a low entropy hint it is typically sent in all requests.
A desktop browser would usually send requests with the following header:
A browser on a mobile device would usually send requests with the following header:
|User-Agent Client Hints |
BCD tables only load in the browser