Google’s use of a page’s mobile content for indexing and ranking.
Mobile-first indexing means Google uses the mobile version of a page’s content for indexing and ranking. The practical focus is whether the information available in the mobile experience represents the page properly. It is not an instruction to ignore desktop customers or maintain only a small-screen website.
Google recommends equivalent primary content across mobile and desktop versions. Layouts can differ while preserving the information. A mobile accordion that organizes existing content is not the same as removing that content from the mobile page or requiring an interaction to load it from elsewhere.
Review more than how attractive the first screen looks. Important text, images, links and relevant metadata need to remain available. If a redesign removes substantial product or service information on mobile to create a cleaner appearance, the indexing consequences should be considered alongside the customer experience.
Takeaway: Check that mobile visitors and Google can access the important information your desktop page provides. Adapt presentation for the screen without quietly dropping the substance of the page.
Example
A course provider shortens its mobile page by removing entry requirements that remain visible on desktop. A better design might organize the requirements into a readable mobile section while keeping the content available. The aim is useful content parity, not forcing the desktop layout onto a smaller screen.
What to check
Inspect the rendered mobile page and compare its primary content, directives and images with desktop. Distinguish content already present in an expandable component from content loaded only after a click. Mobile-first indexing is not a guarantee of ranking and does not mean every hidden visual element is ignored.
For more detail, see Mobile-first indexing best practices.