How to check mobile compatibility after Google Mobile-Friendly Test is discontinued?

Google discontinued google mobile friendly test and the “Mobile Usability” report in Search Console in December 2023. The removal of the former one-time check that indicated whether a page was mobile-friendly does not mean that mobile compatibility no longer affects indexing and rankings; Google still primarily uses Smartphone Googlebot to crawl webpages and uses mobile content as the basis for indexing and evaluation.

What truly needs to be replaced is not a green “Pass” badge, but three types of assessment: whether Google can crawl and render the mobile page; whether users can use it normally on real mobile networks; and whether page speed and layout stability undermine the experience. No single tool can cover all three, so a more reliable approach is to combine URL Inspection, PageSpeed Insights, and real-device testing.

First, use URL Inspection to confirm whether Google sees the page correctly

Go to “URL Inspection” in Google Search Console, enter the full URL, and first review the indexed version. What needs to be confirmed here is not whether the page can open on your own computer, but whether the page Google most recently crawled is indexable, whether the expected canonical page has been selected, and whether crawling was performed using Smartphone Googlebot.

If the page was recently modified and has not yet been recrawled, or if you suspect that what Google reads differs from the browser result, you can use “Test Live URL.” Focus on the crawl and rendering results: if the screenshot shows blank areas, missing main content, pop-up overlays, broken styling, or errors, the issue is usually not “screen size,” but resource loading, front-end rendering, or access restrictions.

• JavaScript dependencies:If above-the-fold main content, product specifications, or language-switching content relies entirely on asynchronous script loading, confirm that Google can actually obtain this content after rendering.
• Resource accessibility:If CSS, JavaScript, image CDNs, or font files are blocked by robots.txt, WAF, regional restrictions, or login verification, Googlebot may receive an incomplete page.
• Responsive consistency:Do not lose core product information, body content, internal links, or structured data between desktop and mobile versions because of CSS hiding.
• Abnormal status codes:Incorrect redirects on mobile, 4xx/5xx responses, or redirects to irrelevant pages can all affect normal crawling.

URL Inspection is suitable for answering whether a search engine can see the page, but it is not a speed-testing tool and cannot replace user interaction testing. A normal inspection result only indicates that there are no obvious obstacles in the indexing process.

Use PageSpeed Insights to identify mobile performance and layout issues

PageSpeed Insights (PSI) should be used as an entry point for routine troubleshooting. After entering a URL, distinguish between “real-user data” and Lighthouse lab data. The former comes from qualifying Chrome user experience datasets and reflects the experience of existing visits; the latter runs in a simulated mobile environment and is suitable for identifying reproducible performance issues on the current page.

On mobile, pay particular attention to the three Core Web Vitals: LCP reflects how quickly primary content appears, INP reflects the responsiveness of interactions such as clicks, expanding menus, and form submissions, and CLS reflects whether elements shift during page loading. They are not the entirety of “mobile compatibility,” but they often expose issues that affect inquiries and browsing, such as uncompressed above-the-fold images, too many third-party tracking scripts, Cookie banners squeezing content, and images or embedded content without reserved dimensions.

PSI diagnostic recommendations should be assessed based on the actual functionality of the page, rather than mechanically pursuing a perfect score. Common multilingual scripts, customer service tools, form validation, maps, and videos on international trade websites all add loading costs. A more valuable order of action is to first ensure that above-the-fold core content and inquiry entry points are usable, then compress images and defer non-critical scripts, and finally assess whether unnecessary third-party components should be removed.

Browser device mode is only suitable for preliminary screening; real-device testing remains essential

The device toolbar in Chrome DevTools can quickly switch screen width, pixel density, and network throttling, making it suitable for checking breakpoints during redesigns: whether navigation collapses properly, whether tables overflow horizontally, whether buttons are truncated, and whether fixed bottom contact information blocks forms. Its advantage is efficiency; its limitation is that it cannot fully simulate browsers on different operating systems, keyboard pop-ups, permission prompts, and real network fluctuations.

Pages involving inquiries, orders, or document downloads should complete full-path testing in at least common mobile browsers: enter from a search landing page, switch languages, open product details, click WhatsApp, email, or forms, and after submission, confirm that success messages and email notifications function properly. Many pages are visually “responsive,” but country code input fields cannot bring up the numeric keyboard, verification codes are covered by floating buttons, or attachment uploads fail. Such issues would not have been automatically identified by the former mobile friendly test.

Do not mistake “responsive design” for “mobile-ready”

Responsive CSS addresses layouts changing with screen size, but it cannot automatically solve the mobile experience. Common risks include: desktop-sized images being directly scaled down, causing slow above-the-fold loading; product specification tables being difficult to read on phones; menu hierarchies being too deep; small fonts and dense links causing accidental taps; pop-ups or ads covering main content; and too many animations and autoplay videos being retained on mobile.

For pages that rely on Google organic traffic, also check whether content signals are consistent between mobile and desktop versions. If product models, application descriptions, FAQs, breadcrumbs, and related product links are removed from mobile for the sake of “simplicity,” the information Google can read when indexing with the mobile version will also decrease. The correct approach is not simply to hide information, but to improve readability through collapsible sections, anchor navigation, short paragraphs, and horizontally scrollable tables while retaining crawlable core content.

Incorporate checks into the publishing process rather than remedying issues after indexing anomalies occur

Whenever you change themes, modify navigation, integrate marketing scripts, add multilingual pages, or adjust the CDN, you should spot-check the homepage, core product pages, content pages, and form landing pages. First confirm the layout in browser device mode, then use PSI to review mobile performance and layout shifts, and finally use Search Console to test the live URL for important URLs. If a page has already been indexed but traffic or impressions are abnormal, further determine the scope of the issue by reviewing the “Page indexing” status, crawl time, and canonical page information in Search Console.

After google mobile friendly test was discontinued, testing shifted from a one-time “pass/fail” check to ongoing validation. For operational execution, the key is not to find an identical replacement button, but to distinguish among rendering, performance, and conversion-path issues: if Google cannot see the page, address crawling and resources first; if the page loads slowly, address above-the-fold content and scripts first; if users cannot complete an action, return to the real-device process and fix issues one by one.