An In-Depth Guide And Best Practices For Mobile SEO


Over the years, search engines have encouraged businesses to improve the mobile experience on their websites.

Today, all websites should be mobile-first. Google prioritizes the mobile versions of websites when indexing them for mobile and desktop.

Mobile has gone from a good idea to a best practice to a default assumption. If your website isn’t optimized for mobile, you’re way behind.

As early as January 2014, Google expanded its search performance feature in Google Search Console (known then as Google Webmaster Tools) to include mobile performance measurements.

Later that year, they expanded PageSpeed Insights to include mobile recommendations.

A March 2015 update, referred to as “Mobilegeddon” by many SEO pros, prioritized sites that rendered well on mobile devices.

Is your site mobile-friendly? Have you optimized your SEO for the mobile experience?

This guide will provide you with all that you need to know about mobile SEO and how to optimize your site to meet this modern demand.

What Is Mobile SEO And Why Is It Important?

The goal of mobile SEO is to optimize your website to attain better visibility in search engine results specifically tailored for mobile devices.

This form of SEO not only aims to boost search engine rankings, but also prioritizes enhancing mobile user experience through both content and technology.

While, in many ways, mobile SEO and traditional SEO share similar practices, additional steps related to site rendering and content are required to meet the needs of mobile users and the speed requirements of mobile devices.

Does this need to be a priority for your website? How urgent is it?

Consider this: 58% of the world’s web traffic comes from mobile devices.

If you aren’t focused on mobile users, there is a good chance you’re missing out on a tremendous amount of traffic.

Mobile-First Indexing

Additionally, as of 2023, Google has switched its crawlers to a mobile-first indexing priority.

This means that the mobile experience of your site is critical to maintaining efficient indexing, which is the step before ranking algorithms come into play.

Read more: Where We Are Today With Google’s Mobile-First Index

How Much Of Your Traffic Is From Mobile?

How much traffic potential you have with mobile users can depend on various factors, including your industry (B2B sites might attract primarily desktop users, for example) and the search intent your content addresses (users might prefer desktop for larger purchases, for example).

Regardless of where your industry and the search intent of your users might be, the future will demand that you optimize your site experience for mobile devices.

How can you assess your current mix of mobile vs. desktop users?

An easy way to see what percentage of your users is on mobile is to go into Google Analytics 4.

  • Click Reports in the left column.
  • Click on the Insights icon on the right side of the screen.
  • Scroll down to Suggested Questions and click on it.
  • Click on Technology.
  • Click on Top Device model by Users.
  • Then click on Top Device category by Users under Related Results.
  • The breakdown of Top Device category will match the date range selected at the top of GA4.
Screenshot from GA4, March 2024

You can also set up a report in Looker Studio.

  • Add your site to the Data source.
  • Add Device category to the Dimension field.
  • Add 30-day active users to the Metric field.
  • Click on Chart to select the view that works best for you.
Looker mobile v desktop - An In-Depth Guide And Best Practices For Mobile SEOScreenshot from Looker Studio, March 2024

You can add more Dimensions to really dig into the data to see which pages attract which type of users, what the mobile-to-desktop mix is by country, which search engines send the most mobile users, and so much more.

Read more: Why Mobile And Desktop Rankings Are Different

How To Check If Your Site Is Mobile-Friendly

Now that you know how to build a report on mobile and desktop usage, you need to figure out if your site is optimized for mobile traffic.

While Google removed the mobile-friendly testing tool from Google Search Console in December 2023, there are still a number of useful tools for evaluating your site for mobile users.

Bing still has a mobile-friendly testing tool that will tell you the following:

  • Viewport is configured correctly.
  • Page content fits device width.
  • Text on the page is readable.
  • Links and tap targets are sufficiently large and touch-friendly.
  • Any other issues detected.

Google’s Lighthouse Chrome extension provides you with an evaluation of your site’s performance across several factors, including load times, accessibility, and SEO.

To use, install the Lighthouse Chrome extension.

  • Go to your website in your browser.
  • Click on the orange lighthouse icon in your browser’s address bar.
  • Click Generate Report.
  • A new tab will open and display your scores once the evaluation is complete.
Lighthouse Scores - An In-Depth Guide And Best Practices For Mobile SEOScreenshot from Lighthouse, March 2024

You can also use the Lighthouse report in Developer Tools in Chrome.

  • Simply click on the three dots next to the address bar.
  • Select “More Tools.”
  • Select Developer Tools.
  • Click on the Lighthouse tab.
  • Choose “Mobile” and click the “Analyze page load” button.
Lighthouse in Developer Tools - An In-Depth Guide And Best Practices For Mobile SEOScreenshot from Lighthouse, March 2024

Another option that Google offers is the PageSpeed Insights (PSI) tool. Simply add your URL into the field and click Analyze.

PSI will integrate any Core Web Vitals scores into the resulting view so you can see what your users are experiencing when they come to your site.

PageSpeed Insights - An In-Depth Guide And Best Practices For Mobile SEOScreenshot from PageSpeed Insights, March 2024

Other tools, like WebPageTest.org, will graphically display the processes and load times for everything it takes to display your webpages.

With this information, you can see which processes block the loading of your pages, which ones take the longest to load, and how this affects your overall page load times.

You can also emulate the mobile experience by using Developer Tools in Chrome, which allows you to switch back and forth between a desktop and mobile experience.

Developer Tools Device Change - An In-Depth Guide And Best Practices For Mobile SEOScreenshot from Google Chrome Developer Tools, March 2024

Lastly, use your own mobile device to load and navigate your website:

  • Does it take forever to load?
  • Are you able to navigate your site to find the most important information?
  • Is it easy to add something to cart?
  • Can you read the text?

Read more: Google PageSpeed Insights Reports: A Technical Guide

How To Optimize Your Site Mobile-First

With all these tools, keep an eye on the Performance and Accessibility scores, as these directly affect mobile users.

Expand each section within the PageSpeed Insights report to see what elements are affecting your score.

These sections can give your developers their marching orders for optimizing the mobile experience.

While mobile speeds for cellular networks have steadily improved around the world (the average speed in the U.S. has jumped to 27.06 Mbps from 11.14 Mbps in just eight years), speed and usability for mobile users are at a premium.

Read more: Top 7 SEO Benefits Of Responsive Web Design

Best Practices For Mobile Optimization

Unlike traditional SEO, which can focus heavily on ensuring that you are using the language of your users as it relates to the intersection of your products/services and their needs, optimizing for mobile SEO can seem very technical SEO-heavy.

While you still need to be focused on matching your content with the needs of the user, mobile search optimization will require the aid of your developers and designers to be fully effective.

Below are several key factors in mobile SEO to keep in mind as you’re optimizing your site.

Site Rendering

How your site responds to different devices is one of the most important elements in mobile SEO.

The two most common approaches to this are responsive design and dynamic serving.

Responsive design is the most common of the two options.

Using your site’s cascading style sheets (CSS) and flexible layouts, as well as responsive content delivery networks (CDN) and modern image file types, responsive design allows your site to adjust to a variety of screen sizes, orientations, and resolutions.

With the responsive design, elements on the page adjust in size and location based on the size of the screen.

You can simply resize the window of your desktop browser and see how this works.

Responsive design - An In-Depth Guide And Best Practices For Mobile SEOScreenshot from web.dev, March 2024

This is the approach that Google recommends.

Adaptive design, also known as dynamic serving, consists of multiple fixed layouts that are dynamically served to the user based on their device.

Sites can have a separate layout for desktop, smartphone, and tablet users. Each design can be modified to remove functionality that may not make sense for certain device types.

This is a less efficient approach, but it does give sites more control over what each device sees.

While these will not be covered here, two other options:

  • Progressive Web Apps (PWA), which can seamlessly integrate into a mobile app.
  • Separate mobile site/URL (which is no longer recommended).

Read more: An Introduction To Rendering For SEO

Image Optimization

Images add a lot of value to the content on your site and can greatly affect the user experience.

From page speeds to image quality, you could adversely affect the user experience if you haven’t optimized your images.

This is especially true for the mobile experience. Images need to adjust to smaller screens, varying resolutions, and screen orientation.

One of the most important things you can do is incorporate responsive elements into your site’s cascading style sheets (CSS).

Rather than assigning absolute pixel values for images on your pages, use relative units of measure, such as a percentage of the page width. This will allow images on your pages to be responsive to various screen sizes.

This would be an example of an image setting with an absolute pixel value:

Absolute image width - An In-Depth Guide And Best Practices For Mobile SEOScreenshot from author, March 2024

Here is an image setting as a percentage of the page width:

Relative image width - An In-Depth Guide And Best Practices For Mobile SEOScreenshot from author, March 2024

In addition to CSS changes, consider updating the file formats of images on your site. Modern image formats offer more efficient and lossless compression than the older JPEG and PNG file types.

Some new image file formats developed for mobile include AVIF and WebP for Android devices and HEIC for IOS devices.

The new file formats can save as much as 34% in file size, which can result in significant improvements in page load times for media-rich pages.

WordPress users are able to take advantage of image optimization plugins, which can automatically convert your images to next-gen image formats. Other content management systems, such as Wix, automatically optimize images.

Read more: 12 Important Image SEO Tips You Need To Know

Avoid Intrusive Interstitials

Google rarely uses concrete language to state that something is a ranking factor or will result in a penalty, so you know it means business about intrusive interstitials in the mobile experience.

Intrusive interstitials are basically pop-ups on a page that prevent the user from seeing content on the page.

John Mueller, Google’s Senior Search Analyst, stated that they are specifically interested in the first interaction a user has after clicking on a search result.

google examples 480x297 - An In-Depth Guide And Best Practices For Mobile SEO

Not all pop-ups are considered bad. Interstitial types that are considered “intrusive” by Google include:

  • Pop-ups that cover most or all of the page content.
  • Non-responsive interstitials or pop-ups that are impossible for mobile users to close.
  • Pop-ups that are not triggered by a user action, such as a scroll or a click.

Read more: 7 Tips To Keep Pop-Ups From Harming Your SEO

Structured Data

Most of the tips provided in this guide so far are focused on usability and speed and have an additive effect, but there are changes that can directly influence how your site appears in mobile search results.

Search engine results pages (SERPs) haven’t been the “10 blue links” in a very long time.

They now reflect the diversity of search intent, showing a variety of different sections to meet the needs of users. Local Pack, shopping listing ads, video content, and more dominate the mobile search experience.

As a result, it’s more important than ever to provide structured data markup to the search engines, so they can display rich results for users.

In this example, you can see that both Zojirushi and Amazon have included structured data for their rice cookers, and Google is displaying rich results for both.

Rice cooker rich result - An In-Depth Guide And Best Practices For Mobile SEOScreenshot from search for [Japanese rice cookers], Google, March 2024

Adding structured data markup to your site can influence how well your site shows up for local searches and product-related searches.

Using JSON-LD, you can mark up the business, product, and services data on your pages in Schema markup.

If you use WordPress as the content management system for your site, there are several plugins available that will automatically mark up your content with structured data.

Read more: What Structured Data To Use And Where To Use It?

Content Style

When you think about your mobile users and the screens on their devices, this can greatly influence how you write your content.

Rather than long, detailed paragraphs, mobile users prefer concise writing styles for mobile reading.

Each key point in your content should be a single line of text that easily fits on a mobile screen.

Your font sizes should adjust to the screen’s resolution to avoid eye strain for your users.

If possible, allow for a dark or dim mode for your site to further reduce eye strain.

Headers should be concise and address the searcher’s intent. Rather than lengthy section headers, keep it simple.

Finally, make sure that your text renders in a font size that’s readable.

Read more: 10 Tips For Creating Mobile-Friendly Content

Tap Targets

As important as text size, the tap targets on your pages should be sized and laid out appropriately.

Tap targets include navigation elements, links, form fields, and buttons like “Add to Cart” buttons.

Targets smaller than 48 pixels by 48 pixels and targets that overlap or are overlapped by other page elements will be called out in the Lighthouse report.

Tap targets are essential to the mobile user experience, especially for ecommerce websites, so optimizing them is vital to the health of your online business.

Read more: Google’s Lighthouse SEO Audit Tool Now Measures Tap Target Spacing

Prioritizing These Tips

If you have delayed making your site mobile-friendly until now, this guide may feel overwhelming. As a result, you may not know what to prioritize first.

As with so many other optimizations in SEO, it’s important to understand which changes will have the greatest impact, and this is just as true for mobile SEO.

Think of SEO as a framework in which your site’s technical aspects are the foundation of your content. Without a solid foundation, even the best content may struggle to rank.

  • Responsive or Dynamic Rendering: If your site requires the user to zoom and scroll right or left to read the content on your pages, no number of other optimizations can help you. This should be first on your list.
  • Content Style: Rethink how your users will consume your content online. Avoid very long paragraphs. “Brevity is the soul of wit,” to quote Shakespeare.
  • Image Optimization: Begin migrating your images to next-gen image formats and optimize your content display network for speed and responsiveness.
  • Tap Targets: A site that prevents users from navigating or converting into sales won’t be in business long. Make navigation, links, and buttons usable for them.
  • Structured Data: While this element ranks last in priority on this list, rich results can improve your chances of receiving traffic from a search engine, so add this to your to-do list once you’ve completed the other optimizations.

Summary

From How Search Works, “Google’s mission is to organize the world’s information and make it universally accessible and useful.”

If Google’s primary mission is focused on making all the world’s information accessible and useful, then you know they will prefer surfacing sites that align with that vision.

Since a growing percentage of users are on mobile devices, you may want to infer the word “everywhere” added to the end of the mission statement.

Are you missing out on traffic from mobile devices because of a poor mobile experience?

If you hope to remain relevant, make mobile SEO a priority now.


Featured Image: Paulo Bobita/Search Engine Journal



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