See your page on a phone.
Paste any page. It opens on a 390px phone in a real browser and is measured on 9 checks: the four Google’s retired Mobile-Friendly Test ran, and five it never did.
Try it on
- Free, no sign-up
- About 20 seconds
- Real browser, real CSS
What it checks
9 things, measured on the page
Each check is a measurement with its threshold shown, not an AI opinion. The same rules run in LandingBoost’s full scan.
Viewport tag
The page tells phones to use their own width (width=device-width) and does not block zooming.
Google’s old test checked thisFits the phone width
Nothing is wider than the screen, so visitors never pan sideways to read or find a button.
Google’s old test checked thisText size
Paragraph text is at least 14px (16px reads comfortably and stops iOS zooming into forms). Legal small print is left out.
Google’s old test checked thisTap target size
Buttons and links are at least 24px (WCAG 2.2 minimum); the main button 44px tall. Links inside sentences are exempt.
Google’s old test checked thisButton in the first screen
A visitor sees one clear next step before scrolling, not only a menu link.
Cookie banner over the button
On a first visit, the cookie or consent banner does not sit on top of the main button.
Headline size
The headline alone takes less than 40% of the first screen, so the explanation and button stay in view.
First-screen explanation
The first screen has a full sentence (10+ words) saying what this is, not only a slogan.
Paragraph length
No paragraph fills a quarter of the phone screen or runs past 50 words.
How it works
Three steps, no account
- 1
Paste a page
Any page: your homepage, pricing, a blog post.
- 2
We open it on a phone
390 × 844 with touch, as a first-time visitor with no cookies.
- 3
See what to fix
Each problem with its measurement and the size or rule to aim for.
Background
Google’s Mobile-Friendly Test is gone
Retired 1 December 2023
On 1 December 2023 Google retired the Mobile-Friendly Test, its API and the Mobile Usability report in Search Console, and sent people to Lighthouse. Mobile usability did not stop mattering: it is still part of Google’s page experience guidance, and most visitors to a new product arrive on a phone.
Lighthouse scores speed, accessibility and SEO. It does not tell you whether a cookie banner sits on your main button, whether your headline pushes the button below the fold, or whether the first screen says what your product is. Those are the reasons a phone visitor leaves, so this test checks them next to the layout basics.
Questions
About the test
Is this Google’s Mobile-Friendly Test?
No. Google retired its Mobile-Friendly Test, the test’s API and Search Console’s Mobile Usability report on 1 December 2023, and pointed people to Lighthouse. This test measures the same layout basics the old test flagged (the viewport tag, content wider than the screen, small text, small tap targets) and adds the first-screen questions it never asked. Mobile usability is still part of Google’s page experience guidance.
What phone does it use?
A 390 × 844 pixel screen (the size of an iPhone 12 to 15) with touch, the user agent of a current iPhone, in Chrome. Your page loads with its real styles and scripts, as a first-time visitor with no cookies would see it.
Why does it look different on my own phone?
Your phone may have accepted the cookie banner already, be signed in, or get another version of an A/B test. This test is always a first visit, which is what a new visitor from search or an ad sees.
Does it change anything on my site?
No. It opens the page, scrolls it once, measures it and takes a picture. It never clicks, fills in or submits anything.
Is it free?
Yes, with no sign-up. Each person gets a few tests an hour so the browser stays fast for everyone.
How do I keep it from breaking again?
Pages change without anyone noticing: a new cookie tool, a plugin update, a redesign. LandingBoost opens your page every day and tells you when something that stops sign-ups appears. Daily checks are free for one site.
More free tools
Check the rest of your page
Broken link checker
Every link on a page opened and sorted: broken, redirected, refused by the site, fine.
OpenLink preview checker
What X, LinkedIn, Slack, Discord, Facebook, WhatsApp and iMessage show when your link is pasted.
OpenWebsite screenshot
Your whole page on a phone and a desktop, as a first-time visitor sees it, ready to download.
Open