Google: we render pages with both desktop & mobile user-agents.

Google’s John Mueller said on Twitter that pages can still be rendered by Google’s desktop user agent when Google shifts to mobile-first indexing for a domain.

Google mobile first indexing

Although some pages will be indexed with the desktop user agent, only the content of the pages for mobile will be indexed:

Check your web pages with a mobile user agent

Use the website audit tool in SEOprofiler to check your web pages with a mobile user agent. The website audit tool also enables you to check your pages with a desktop user agent:

Check your website now

Johannes Selbach

Johannes Selbach is the CEO of SEOprofiler. He blogs about search engine optimization and website marketing topics at "http://blog.seoprofiler.com".