The mobile-friendly ranking system was Google's use of mobile-friendliness as a ranking signal for mobile searches, expanded worldwide from 21 April 2015 and nicknamed Mobilegeddon by the industry. Google confirmed it. In April 2023 it was removed from the ranking systems guide, and Google retired the Mobile-Friendly Test and Mobile Usability report from December 2023. Google now says aspects of page experience other than Core Web Vitals do not directly help rankings, so mobile display is a user requirement first.
What was the mobile-friendly ranking system?
The mobile-friendly ranking system was Google's use of whether a page works well on a phone as a ranking signal for mobile searches. Google announced on 26 February 2015 that from 21 April 2015 it would expand this signal to mobile searches in all languages worldwide. The industry called the rollout Mobilegeddon.
Google's announcement pointed site owners to its Mobile-Friendly Test and the Mobile Usability report in Webmaster Tools to see how Googlebot viewed their pages.
Starting April 21, we will be expanding our use of mobile-friendliness as a ranking signal.
Google, Finding more mobile-friendly search results, Google Search Central Blog
How did the mobile-friendly signal relate to mobile-first indexing?
They were separate. Mobile-friendliness was a ranking signal; mobile-first indexing is about which version of a page Google crawls and indexes. When Google began migrating sites to mobile-first indexing in March 2018, it said being indexed this way had no ranking advantage and operated independently from its mobile-friendly assessment.
From 2020 the mobile-friendly signal became one of the listed page experience signals, alongside Core Web Vitals, HTTPS and intrusive interstitials.
Being indexed this way has no ranking advantage and operates independently from our mobile-friendly assessment.
Google, Rolling out mobile-first indexing, Google Search Central Blog
What evidence is there that Google used a mobile-friendly ranking system?
The evidence label is Confirmed: Google announced the signal and its launch date. The retirement is also on record. On 21 April 2023 Search Engine Roundtable reported that the mobile-friendly ranking system had been removed from the retired systems list in Google's ranking systems guide.
Google then retired its own measurement tools from 1 December 2023, while stating that mobile usability remained part of its page experience guidance. Google's current page experience documentation says aspects beyond Core Web Vitals do not directly help a site rank higher.
Also starting December 1, 2023, we'll be retiring Search Console's "Mobile Usability" report, the Mobile-Friendly Test tool and Mobile-Friendly Test API.
Danny Sullivan, Google, The role of page experience in creating helpful content, Google Search Central Blog
What should a site do about mobile-friendliness now?
Test mobile display yourself, because Google no longer gives a pass or fail. Google points to Lighthouse for mobile usability in its page experience documentation. Check three common mobile display failures: a missing viewport, content wider than the screen, and tap targets too close together.
Be honest about the payoff. Google does not claim a direct ranking gain for mobile display beyond Core Web Vitals, and mobile-first indexing means a broken mobile page is also the page Google indexes. The measurable gain is usually in mobile engagement and conversion.
Which Laurelin audit checks test for mobile-friendliness?
The new check Content overflows the mobile viewport and forces horizontal scrolling tests the most common mobile display failure that the retired Mobile-Friendly Test used to flag. It measures the user-facing condition, not a live ranking system.
Related existing checks: Missing viewport meta: the viewport configuration the old test required. Tap targets too small: tap target spacing, another old test criterion. Excessive ads or interstitials in main content: interstitials, which Google lists alongside mobile display in page experience. Fonts without font-display swap: text that is invisible while fonts load on mobile.
What are the key dates for mobile-friendly ranking?
- 2015-02-26: Google announces expanded use of mobile-friendliness as a ranking signal (source)
- 2015-04-21: Mobile-friendly ranking expansion starts for mobile searches worldwide (source)
- 2020-05-28: Mobile-friendliness listed as a page experience signal (source)
- 2023-04-21: Mobile-friendly ranking system reported removed from the ranking systems guide (source)
- 2023-12-01: Mobile-Friendly Test, its API and the Mobile Usability report retired (source)
Frequently asked questions about mobile-friendly ranking
Is mobile-friendliness still a Google ranking factor?
Not as a named system. It was removed from Google's ranking systems guide in 2023, and Google says page experience aspects other than Core Web Vitals do not directly help a site rank higher.
What replaced Google's Mobile-Friendly Test?
Google retired the Mobile-Friendly Test, its API and the Mobile Usability report from 1 December 2023 and pointed site owners to other tools such as Lighthouse from Chrome.