--- title: "Mobile-friendly update (2015): what changed and what applies now" url: https://seomadman.com/updates/mobile-friendly-update-2015 section: updates language: en published: 2026-09-26T00:00:00.000Z modified: 2026-09-26T00:00:00.000Z author: Adam Hafez topics: ["Technical SEO"] --- # Mobile-friendly update (2015): what changed and what applies now ## The short answer Google's mobile-friendly update began rolling out globally on 21 April 2015, boosting mobile-friendly pages in mobile search results in all languages. Google had announced it in February and said it would have a significant impact. It worked page by page. The SEO industry nicknamed it Mobilegeddon; Google never used that name. ## Key takeaways - Google announced the change on 26 February 2015 and began the global rollout on 21 April 2015. - It boosted mobile-friendly pages in mobile search results only, in all languages. - Google said it applied to individual pages, not entire websites. - Google strengthened the signal with a further update that it said would start in May 2016. - Mobilegeddon is an industry nickname; Google called it the mobile-friendly update. ## What Google changed Google announced the change on 26 February 2015 in a [Webmaster Central post](https://developers.google.com/search/blog/2015/02/finding-more-mobile-friendly-search): starting on 21 April, it would be "expanding our use of mobile-friendliness as a ranking signal," a change that "will have a significant impact in our search results." On launch day, Google's [rollout post](https://developers.google.com/search/blog/2015/04/rolling-out-mobile-friendly-update) said it was "boosting the ranking of mobile-friendly pages on mobile search results." Google defined mobile-friendly as pages where text is readable without tapping or zooming, tap targets are spaced appropriately, and the page avoids unplayable content or horizontal scrolling. The update affected only mobile rankings, in all languages, and applied "to individual pages, not entire websites." ## When it rolled out Google began the global rollout on 21 April 2015, as announced. It gave no completion date. On 16 March 2016, Google [announced](https://developers.google.com/search/blog/2016/03/continuing-to-make-web-more-mobile) a follow-up that would, beginning in May 2016, increase the effect of the mobile-friendly ranking signal. Mobilegeddon is not Google's name. It came from the SEO industry: [Search Engine Journal's history of the update](https://www.searchenginejournal.com/google-algorithm-history/mobile-friendly-update/) says several nicknames circulated before "Mobilegeddon" stuck. Google called it the mobile-friendly update. ## What is known about its impact Google gave no percentage. Its own words were that the change would "have a significant impact" and that sites whose pages were not mobile-friendly might see "a significant decrease in mobile traffic from Google Search." It also said query intent stayed a very strong signal, so a page with great content could still rank well without being mobile-friendly. Treat any figure attributed to this update as a third-party estimate. ## What site owners should do Mobile-friendliness now sits inside Google's [page experience guidance](https://developers.google.com/search/docs/appearance/page-experience), which asks "Does your content display well on mobile devices?" The same page says that beyond Core Web Vitals, other page experience aspects "don't directly help your website rank higher," though they make a site more satisfying to use. In practice: - Make pages readable on a phone without zooming, with tap targets spaced apart. - Avoid horizontal scrolling and content that cannot play on mobile devices. - Work on Core Web Vitals, the page experience signal Google says its ranking systems use. - Use Chrome Lighthouse to find mobile usability problems. ## How to check whether it affected you This is historical: Search Console keeps 16 months of data, so it cannot show April 2015. If you kept analytics from then, compare mobile organic Google traffic for a week before 21 April 2015 with a week in May, and check desktop traffic stayed flat. The [Google Algorithm Updates timeline](/updates) lists the other updates of 2015, so you can rule them out first. ## Related updates - The [HTTPS ranking signal](/updates/https-ranking-signal-2014) was the page experience signal before it. - The [intrusive interstitials update](/updates/intrusive-interstitials-update-2017) was the next page experience change, in 2017. - The [page experience update](/updates/page-experience-update-2021) was the next page experience change, in 2021. ## Frequently asked questions ### When did the mobile-friendly update launch? Google began rolling it out globally on 21 April 2015, the date it had set in its February 2015 announcement. Google did not state a completion date. ### Why was it called Mobilegeddon? The nickname came from the SEO industry, not Google. Search Engine Journal's history of the update says several nicknames circulated before Mobilegeddon stuck. Google called it the mobile-friendly update. ### Did the mobile-friendly update affect desktop rankings? No. Google said it affected only search rankings on mobile devices, applied in all languages globally, and worked on individual pages rather than entire websites. ### Does mobile-friendliness still matter for Google? Google's page experience guidance asks whether content displays well on mobile devices, but says that beyond Core Web Vitals, other page experience aspects don't directly help a site rank higher. ## Sources 1. [Rolling out the mobile-friendly update](https://developers.google.com/search/blog/2015/04/rolling-out-mobile-friendly-update) - Google Search Central Blog (primary) 2. [Finding more mobile-friendly search results](https://developers.google.com/search/blog/2015/02/finding-more-mobile-friendly-search) - Google Search Central Blog (primary) 3. [Continuing to make the web more mobile friendly](https://developers.google.com/search/blog/2016/03/continuing-to-make-web-more-mobile) - Google Search Central Blog (primary) 4. [Mobilegeddon: A Complete Guide to Google's Mobile-Friendly Update](https://www.searchenginejournal.com/google-algorithm-history/mobile-friendly-update/) - Search Engine Journal 5. [Understanding page experience in Google Search results](https://developers.google.com/search/docs/appearance/page-experience) - Google Search Central (primary)