What Is Mobile-First Indexing? What It Means for Your Site

Mobile-first indexing means Google uses the mobile version of your website, crawled with its smartphone crawler, to decide what your pages are about and where they rank. If something is missing or broken on your phone version, Google treats it as missing or broken, even if your desktop site is perfect. Google finished moving the whole web over in 2023, so it now applies to every site.

For a business owner the takeaway is simple: what customers see on a phone is what Google judges you on. This article explains what changed, how to check your site and what to fix.

What is mobile-first indexing?

Indexing is how Google reads and stores your pages so it can show them in search results. In the past Google read the desktop version of a page. Now it reads the mobile version instead. Google’s own mobile-first indexing best practices put it this way: Google uses the mobile version of a site’s content, crawled with the smartphone agent, for indexing and ranking.

It is not a separate mobile index, and it doesn’t mean desktop searchers see different results. It means the phone version of each page is the one Google uses for everyone.

Has mobile-first indexing launched?

Yes. Google mobile-first indexing rolled out site by site over several years, and on 31 October 2023 Google announced that the move was complete (Mobile-first indexing has landed). If your Search Console once showed a message saying your site had been switched, that switch has now happened for the whole web.

Does Google still use mobile-first indexing?

Yes. It isn’t a phase that ended in 2023. It is simply how Google crawls and indexes websites now. Is mobile-first indexing Google’s approach for every new site you launch? Yes, so any website you build or redesign should be planned phone first.

How do I know if Google is reading my mobile site first?

You can check in Google Search Console, the free tool Google gives website owners:

1. Open your property in Google Search Console.
2. Paste one of your page addresses into the search bar at the top to run the URL Inspection tool.
3. Look at the crawl details. “Crawled as Googlebot smartphone” means Google is reading the mobile version.
4. Click “View crawled page” to see the HTML and screenshot Google actually saw.

If the crawled page is missing text, images or links that your desktop page has, that is the content Google can’t see.

How can I optimise my website for mobile-first indexing?

Mobile first indexing SEO comes down to making the phone version complete, fast and easy to crawl. Here is our SEO mobile-first indexing checklist:

• Same content on mobile and desktop. Text, headings, images and videos that appear on desktop should appear on mobile too. Content inside tabs or accordions is fine, as long as it loads on the page.
• Same structured data and meta tags. Your page titles, meta descriptions and structured data (code that labels things like your address and opening hours) should match across both versions.
• Images with alt text and sensible sizes. Compress images so pages load quickly on mobile data, and describe each image in its alt text.
• No content hidden behind actions. Google doesn’t tap, swipe or type to load content, so anything that only appears after an interaction may never be seen.
• Let Google crawl everything. Don’t block CSS, JavaScript or image files in your robots.txt file.
• Tap-friendly design. Buttons big enough for a thumb, text readable without zooming, and your phone number one tap away.

A responsive website (one design that adapts to every screen size) handles most of this automatically, which is why Google recommends it as the simplest set-up.

How can businesses use mobile-first indexing for better SEO?

Treat it as a prompt to look at your website the way most local customers already do: on a phone, often on the move. Open your own site on your phone and try to do the three things customers want most, such as finding your hours, calling you and booking or buying.

Every step that is slow, fiddly or missing is a problem for customers and for Google. Fixing those steps often improves enquiries before it improves rankings. And when visitors stay and engage instead of leaving straight away, your bounce rate drops too. For a regional business, where someone may be searching from a ute between jobs in Red Cliffs or Merbein, a quick, clear mobile page can decide who gets the call.

Frequently asked questions

Do I need a separate mobile website?

No. Google recommends a responsive website, where one set of pages adapts to every screen. Separate mobile sites (often on an “m.” address) are harder to keep in step with the desktop version, and any content missing from them is invisible to Google.

Does this mean my desktop site doesn’t matter?

No. Desktop visitors still matter, and Google still shows your pages to people on computers. It only changes which version Google reads to understand and rank your pages. Keep both versions complete and consistent, and design the mobile version first.

Is having a mobile-friendly website a ranking factor?

A good mobile experience is part of what Google calls page experience, which its documentation says its ranking systems reward. More importantly, a poor mobile version means Google may miss your content altogether, which hurts rankings far more than any single factor.

Do I need a new website to suit Google’s mobile crawler?

Not always. Many older sites can be fixed with a responsive theme, compressed images and some layout changes. If the site was built for desktop only, a rebuild is often cheaper than patching it. At Rock Solid Marketing, responsive websites start from $5,000 + GST for our Essentials package (up to 5 pages). If a few fixes will do the job, we’ll tell you before we quote.

The short version

Google now reads and ranks the phone version of your website. Check what Google sees with the URL Inspection tool, make sure your mobile pages carry all your content, and keep them fast and easy to use. If you’d like a hand, our technical SEO team can audit your site, and our web design team builds responsive sites from the ground up.