FAST DEV 24

Free mobile-friendly test and website checker

Google retired its Mobile-Friendly Test on December 1, 2023. Paste your address here instead: ten seconds, no sign-up.

What I check: 17 checks, from HTTPS and mobile layout to speed and a phone number you can tap.

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HTTPS and the SSL certificate

The check opens your address over https:// and then tries the plain http:// version to see whether it sends visitors on to the secure one. Without a valid certificate, browsers mark the site “Not secure”, and a customer sees that warning before leaving a phone number or paying. Many hosts and Cloudflare issue a free certificate from the control panel; after that, set http:// to redirect to https://. A certificate also expires: click the icon to the left of the address bar, look at the end date and renew it in time.

Speed on a phone

The check times how fast your server starts sending the page (a pass is under 1.5 seconds), measures the HTML size (under 300 KB), counts external scripts and finds images without a set size, which make the page jump while it loads. On mobile data each of these adds delay, and a visitor looking at a blank screen can simply go back to the search results. Google’s own yardstick, Core Web Vitals, counts a page as good when the main content appears within 2.5 seconds, a tap gets a response within 200 milliseconds and the layout shift score is 0.1 or less; PageSpeed Insights measures them for free. The usual fixes are to compress images, remove plugins you do not use and move to hosting that answers quickly.

Call button and tel: link

The check looks for a tel: link near the top of the page and for a phone number written as plain text, and tells you which it found and where. On a phone, a number inside a tel: link opens the dialer with one tap, while plain text has to be copied or retyped, and not every customer will bother. The fix is one link around the number in the header, where people look first: its address starts with tel:, followed by the full number with the country code. Make the button easy to hit with a thumb: Google’s Lighthouse flags tap targets smaller than 48 × 48 px.