Google reads your mobile site, not your desktop one
Since mobile-first indexing, the mobile version is the version that determines your rankings. If it is slower, thinner or harder to use than your desktop site, that is the site Google is judging.
Why this decides more than people think
Two figures worth knowing, both from sources you can check.
- 89% of UK mobile users access the internet via smartphoneAccording to Uswitch. If your site does not work properly on a phone, you are invisible to most of the market.
- 76% of people searching for something nearby visit a business within a dayAnd 28% of those searches lead to a purchase, according to Think with Google. Local mobile searches carry unusually high intent.
What mobile-friendly actually means
Not that the site technically loads on a phone. That it works there — that someone can read, tap and buy without pinching, zooming or waiting.
- Responsive layoutAdapts to any screen rather than shrinking the desktop version and hoping.
- Fast on mobile dataNot just on your office wifi. Test it on 4G, away from the building.
- Tap targets sized for fingersButtons and menu items you can hit without aiming.
- Readable without zoomingIf you have to pinch to read it, most people will not bother.
- Minimal pop-upsAn overlay on a small screen is a wall. Google penalises intrusive interstitials, and users leave regardless.
- Tap-to-call that worksA phone number a customer can press. Obvious, and frequently missing or wrongly formatted.
What changes when you fix it
| Mobile-optimised | Desktop-only | |
|---|---|---|
| Mobile-first indexing | Fully supported | Assessed on a version that works poorly |
| Local search | Eligible for map pack and “near me” | Limited visibility |
| Tap to call | One press to phone you | Copy the number manually |
| Speed on mobile data | Loads on 4G without waiting | Often several seconds slower |
| Conversions from mobile | Higher — fewer barriers to enquiring | Lower — people give up first |
| Bounce rate | Lower — people stay | Higher — people leave and go back to Google |
Mobile and local visibility are the same problem
Local search happens on phones. Someone standing in the street looking for a nearby business is not on a laptop, which means the mobile signals and the local signals reinforce each other.
- Google Business ProfileAlmost entirely consumed on mobile, in the map pack, above the organic results.
- Click-to-callThe most common conversion on a local mobile search. If it does not work, the enquiry does not happen.
- Location-aware content and schemaHelps Google connect the page to the place someone is standing.
- Page speedWeighs heaviest on mobile connections, which is where the local searches are.
More on that side of it in local SEO.
Most sites are already mobile-friendly enough
If your site was built in the last five years on a mainstream platform, it is almost certainly responsive already. The question is not whether it adapts to a phone — it is whether it is fast and usable on one.
Those are different problems. Responsive design is largely solved. Mobile speed, tap targets and pop-ups are where the real damage happens, and none of them require a rebuild.
Frequently asked
- How do I check if my site is mobile-friendly?Load it on your own phone on mobile data. Then run it through our health score checker, which covers mobile factors alongside everything else.
- Does mobile design affect local rankings?Yes, substantially. Google rewards mobile-usable sites in local results, and local searches are overwhelmingly mobile.
- Is mobile optimisation included in SEO packages?It is part of technical SEO rather than a separate service. See technical SEO or pricing.
- Will this help with Google Maps?Indirectly. Map pack ranking depends mostly on your Google Business Profile and reviews, but a poor mobile site loses the visitor once they tap through.
- Do I need a separate mobile site?No. Separate mobile sites are a decade out of date. Responsive design serves one site to every device.
If this was useful
- SEO Health Score CheckerCovers mobile factors, speed indicators and the technical basics.
- Would I Buy From This Site?Whether visitors trust the site enough to enquire once they arrive.
- Website refreshIf the site works but has stopped saying the right things. From £199.
- Free SEO auditTells you whether mobile is actually your constraint, or something else is.
Not sure whether mobile is the problem?
The free audit covers mobile alongside content, local signals and tracking — and tells you which is costing you. If mobile is fine, we will say so.