Since 2019, Google has used Mobile-First Indexing for all new websites and since 2023 for the entire index. That means: Google crawls, indexes and evaluates the mobile version of your law firm website primarily — not the desktop version. If your site looks good and loads fast on a smartphone, that has a direct impact on your rankings — even when most of your clients later enquire via desktop.
On top of that comes the usage reality: more than 60% of searches for local services happen on smartphones. Anyone typing "lawyer employment law Hamburg" into the search bar of their phone is on the way to a lawyer, in an acute situation, or doing short-term research. These clients have neither time nor patience for a page that can't be operated at 375 px width.
This article explains what Mobile-First Indexing means for your law firm website, which mistakes occur frequently, and how to systematically check your mobile presentation.
What is the difference between responsive design and mobile-first design?
Responsive design adapts — mobile-first design is built for the smartphone from the start. Responsive design means a desktop website is adapted via CSS rules for smaller screens. Mobile-first means the design was conceived for the smartphone and extended for larger screens. In practice: a responsive law firm website may be operable on a smartphone but not optimal. Mobile-first websites load faster and have touch-friendly elements built in from the start.
How important is font size for mobile rankings?
Google explicitly flags pages with text that is too small as not mobile-friendly. The Mobile-Friendly Test shows the warning "Text too small to read" when body text falls below 12 px. For law firm websites we recommend at least 14 px body text and 16 px for longer texts. Beyond the SEO factor, readability is directly relevant: a client who cannot read your practice areas on a smartphone won't call.
What is Accelerated Mobile Pages (AMP) and do I need it?
AMP is an outdated Google initiative — no longer recommended for law firms today. AMP (Accelerated Mobile Pages) was a special page format for ultra-fast mobile delivery. Google removed AMP as a ranking signal in 2021. Law firms that keep their Core Web Vitals on the regular page in the green zone gain no advantage from AMP. The effort to implement AMP is significant and the benefit for law firm websites today is marginal.
What Mobile-First Indexing concretely means
Mobile-First doesn't mean desktop no longer matters. It means Google bases ranking decisions on the mobile version of your website. If your desktop version is perfect but the mobile version loads slowly or is missing content, that affects your rankings negatively — for all searches, including those from desktop.
Particularly critical: content visible on desktop but hidden on mobile (e.g. via "display: none") is no longer fully indexed by Google. Texts, FAQs or practice-area descriptions visible only to desktop users lose their SEO impact.
The practical consequences are significant: if your law firm website is perfectly structured on desktop but truncates content or shrinks text on the smartphone, Google evaluates the weaker version. This affects not only load speed but also indexing depth — FAQ sections hidden on mobile for space reasons lose their SEO value.
For law firms with older websites this is particularly relevant: many sites were originally built for desktop and later given a responsive theme. But "responsive" doesn't automatically mean "mobile-first optimised". Navigation works, but font sizes, button spacing and load times on 4G have never been systematically checked.
Common mobile issues on law firm websites
Checklist: mobile-first audit of your law firm website
With this checklist you can systematically audit the most important mobile aspects:
Mobile optimisation for your law firm website
OMmatic checks your website for mobile errors and implements the fixes — from responsive scaling to a touch-friendly menu.
Frequently asked questions
Is a responsive theme enough for mobile-first?
A responsive theme is a precondition, but not sufficient. Responsive design means the layout adapts to screen sizes. That is necessary, but not sufficient. Mobile load times (Core Web Vitals), touch-operable elements, readable font sizes and clickable phone numbers must additionally be checked and optimised.
Does a slow mobile version also affect desktop rankings?
Yes. Google evaluates rankings based on the mobile page. Mobile-First Indexing means the mobile crawler is the basis for all rankings. A technically poor mobile page leads to weaker rankings even for desktop searches.
How do I test the mobile presentation of my law firm website?
With Google PageSpeed Insights, the Google Mobile-Friendly Test and Chrome DevTools. Chrome DevTools (F12) offers a device simulation that lets you check your page at various screen sizes. The official Mobile-Friendly Test is available at search.google.com/test/mobile-friendly.
Does my page have to look identical on every smartphone?
Not identical, but equivalently usable. Slight design adjustments for different screen sizes are normal and desirable. What matters is that content, navigation and contact options are fully accessible on all devices and that Core Web Vitals for mobile are in the green zone.
What is the difference between responsive design and mobile-first design?
Responsive design adapts — mobile-first design is built for the smartphone from the start. Responsive design means a desktop website is adapted via CSS for smaller screens. Mobile-first means the design was conceived for the smartphone and extended for larger screens. In practice: a responsive law firm website may be operable on a smartphone but not optimal.
How important is font size for mobile rankings?
Google explicitly flags pages with text that is too small as not mobile-friendly. The Mobile-Friendly Test shows the warning "Text too small to read" when body text falls below 12 px. For law firm websites we recommend at least 14 px body text. Beyond the SEO factor, readability is directly relevant: a client who cannot read your practice areas on a smartphone won't call.
What is AMP and do I need it for my law firm website?
AMP is an outdated Google initiative — no longer recommended for law firms today. AMP (Accelerated Mobile Pages) was a special page format for ultra-fast mobile delivery. Google removed AMP as a ranking signal in 2021. Law firms that keep their Core Web Vitals on the regular page in the green zone gain no advantage from AMP. The effort to implement AMP no longer pays off today.
Conclusion
Mobile-First isn't a design trend — it's Google reality. Law firms that have optimised their website primarily for desktop lose visibility in a market where the majority of searches are made on mobile. The check with PageSpeed Insights and the Mobile-Friendly Test takes a few minutes and immediately shows where action is needed. How the technical optimisation embeds into a wider strategy is explained in our Web Design for Lawyers section.
Mobile optimisation for your law firm website
OMmatic optimises your law firm website for mobile-first — from responsive layout to touch-friendly CTAs and mobile performance.
