On Tuesday, Google will introduce its widely dreaded mobile-friendly algorithm, a change that will favor sites designed for smartphones by boosting their search rankings.

Google sees the update -- which will not affect desktop searches -- as a natural response to the way that consumers use their phones today. But businesses are so concerned about the algorithm's impending impact that the media has dubbed its rollout date Mobilegeddon. 

And indeed, many will be affected. Forty percent of the Internet's top sites aren't considered mobile-friendly by Google's standards, according to marketing company Portent. However, if you're in the same boat, there's no need to pull an all-nighter to get your site in tip-top mobile shape for tomorrow.

It will take a few weeks for Google's update to be completed, Search Engine Land's Barry Schwartz writes. And, unlike some of Google's other algorithms, this one will update its picture of the Web in real-time. So when you do introduce a live mobile site, Google will recognize it relatively quickly.

Love it or hate it, change is coming, but Google and other resource providers have made an effort to take the guesswork out of going mobile. You can read the company's guide for building smartphone-friendly websites. And you can also get started with these tips:

Test your site.

Google has created a tool that lets you check if your site is mobile-friendly. Just type in your site's URL.


The algorithm will make its assessment on a page-by-page basis, meaning that if only part of your site is mobile-optimized, those pages won't be negatively impacted by the ones that aren't. "So make sure your most important pages are indexed as mobile friendly sooner than later," Schwartz advises.

Avoid common mistakes.

Just as you do when creating a desktop site, you'll have to consider best search engine optimization (SEO) practices when designing your mobile pages. Google has highlighted some of the most common SEO errors they see on mobile. These include blocked JavaScript, CSS and images files, content that doesn't play, and app download interstitials. Here's the full list