The Google mobile friendly update 2015 started on April 21, 2015. From that day, Google used mobile-friendliness as a stronger ranking signal in mobile search, so pages that worked well on phones could rank higher there. People nicknamed it "Mobilegeddon", but the real effect was smaller than the name suggested.

What did the mobile-friendly update change?

Google announced the change on February 26, 2015, almost two months early. The post said: "Starting April 21, we will be expanding our use of mobile-friendliness as a ranking signal." This long notice gave site owners time to fix their pages.

The update had three clear limits:

  • Mobile only. It changed rankings only for searches on mobile devices. Desktop results stayed the same.
  • All languages. It applied to search results in all languages around the world.
  • Page by page. Google judged each page on its own, not the whole website.

A mobile-friendly page, in simple words, is one you can read and use on a small screen without zooming in. The text fits the screen, buttons are easy to tap, and the page does not need old plugins like Flash.

Who lost or gained traffic?

Pages that only worked well on a desktop screen had the most to lose in mobile results. Typical examples were:

  • Old blogs with fixed-width themes that showed tiny text on a phone.
  • Small business sites with menus and buttons too small to tap.
  • Sites that used Flash for menus, video or whole pages.
  • Pages with wide tables or images that forced readers to scroll sideways.

Sites with responsive themes gained the most. A responsive theme changes its layout to fit any screen. Many bloggers simply switched to a responsive theme before April 21 and saw no harm at all.

Google never said how many queries the update affected. The "Mobilegeddon" name sounded scary, but many sites saw only small changes.

Is the Google mobile friendly update 2015 still active?

Not as a named system. Google made the signal stronger once more. On March 16, 2016, it said it would increase the effect of the signal from May. On May 12, 2016, John Mueller of Google said the changes had fully rolled out.

In April 2023, Google removed the "mobile-friendly system" from its ranking systems page. It removed the page experience, page speed and secure sites systems at the same time. Danny Sullivan of Google explained that page experience "is not a ranking system but it is a ranking signal".

So mobile use still matters a lot. Google's core systems still use page experience signals, such as speed and ease of use on phones. Google also uses mobile-first indexing, which means it mainly looks at the mobile version of your page when it ranks it. Our guide to the page experience update covers this in more detail.

How to check if it affected your site

The 2015 change is too old for Search Console, which keeps only 16 months of data. You can still check how your site performs on phones today.

  1. Split traffic by device. In the Performance report, click the Devices tab. Compare clicks and average position on mobile and desktop.
  2. Find weak mobile pages. Filter by Device: Mobile, then open the Pages tab. Look for pages that rank much lower on phones than on desktop.
  3. Check Core Web Vitals. Open the Core Web Vitals report and pick Mobile. Core Web Vitals are Google's speed and stability scores for real visitors.
  4. Test pages on a real phone. Open your top pages on your own phone. Check that text is easy to read, buttons are easy to tap and nothing scrolls sideways.
  5. Run Lighthouse in Chrome. Open Chrome DevTools, pick the Lighthouse tab and run a mobile test. Fix the biggest issues it lists first.

What should you do now?

Most sites today already use a responsive theme. The work now is about speed and comfort on small screens.

  • Use a responsive theme. Make sure the same content shows on mobile and desktop, since Google mainly reads the mobile version.
  • Make images light. Big images slow phones down. Our image speed cheat shows quick ways to shrink them.
  • Avoid pop-ups that cover the page. Large pop-ups on phones annoy readers and hurt page experience.
  • Keep tap targets large. Give links and buttons enough space so readers can tap them with a thumb.

The Google mobile friendly update 2015 is now history, but its message is stronger than ever. Most of your readers likely visit on a phone, so build every page for them first.

Frequently asked questions

Was Mobilegeddon an official Google name?

No. Google called it the "mobile-friendly update". Mobilegeddon was a nickname from the SEO industry, chosen because people expected huge losses.

Did the update affect desktop rankings?

No. The 2015 update changed rankings only for searches on mobile devices. Desktop rankings stayed the same.

Does mobile-friendliness still matter for SEO?

Yes. Google removed the mobile-friendly system as a named system in April 2023. But page experience signals still count, and mobile-first indexing means Google mainly ranks the mobile version of your pages.