Author: Bill Ross | Reading Time: 3 minutes | Published: November 7, 2025 | Updated: April 8, 2026 Launch Date: April 21, 2015 By the spring of 2015, mobile search had been happening for a while. But many sites had neglected to optimize their sites for mobile use, without consequence. Google decided that it was time to put sites with no or poor mobile usability at lower ranks than sites with excellent mobile design. Before this change, they were frustrating their users and providing a terrible search experience, especially since much of Google’s search happened—and continues to happen—on mobile devices. The Mobile update put a stop to that. The Mobile update is all about creating the best experience for users on mobile devices. For this reason, the huge triggers for this algorithm update are poor mobile usability. If a site doesn’t have a mobile version, or if a site does have a mobile version, but it’s hardly usable, your rankings will feel it. The hazards for the Mobile update are few, but they’re serious. If you don’t cater website design to mobile users, you can kiss your rankings goodbye. If your site triggers the Mobile update with the hazards we outlined above—if you don’t have a mobile site or if your site isn’t especially mobile-friendly—then Google’s web crawlers will find out and can punish you. You can be severely downranked. At this point, you know the goal of the Mobile update: cater to mobile users. Mobile is the way of the future, and really, of the present. There are a few things you can do to ensure your site serves mobile users and ranks high on Google’s SERPs. Good news: The Mobile update works in real time. Once your site is mobile-friendly, Google’s crawlers can quickly update your ranking. To speed this up, request a recrawl from Google. The best way to optimize for mobile is with an SEO audit, especially if optimization seems daunting. After a thorough review, you’ll know what to improve to enhance the mobile experience and reach more users. The Google Mobile Update and Why Mobile-Friendly Design Matters for SEO

What Google’s Mobile Update Impacted
How The Mobile Update Works
How to Update Your Website Design To Take Advantage of The Mobile Update
Conclusion
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