Mobile-first indexing means the viewport meta is non-negotiable — and blocking zoom is an accessibility fail. Paste a URL — we read the viewport, theme-color and mobile-web-app meta.
The viewport meta tag tells mobile browsers how to size and scale a page — <meta name="viewport" content="width=device-width, initial-scale=1"> is the responsive-web standard. This checker inspects a URL's viewport tag, theme-color, and any zoom-blocking attributes, because Google indexes the mobile version of a site first: a missing or broken viewport makes the page render at desktop width on phones, hurting both rankings and readability.
The viewport meta tag tells mobile browsers to render a page at the device's real width instead of a default ~980px desktop canvas. Every responsive site needs <meta name="viewport" content="width=device-width, initial-scale=1"> — without it, phones show a shrunken, hard-to-read layout.
Yes. Google uses mobile-first indexing, so it ranks the mobile rendering of your page; a missing or misconfigured viewport makes that mobile version look broken and unusable, which weakens rankings and mobile usability scores.
Yes — blocking pinch-to-zoom is an accessibility failure under WCAG 1.4.4 and is flagged by Lighthouse. Users who need to enlarge text can't, so leave zoom enabled and avoid maximum-scale below 5.
theme-color sets the color of the browser toolbar and address bar on supported mobile browsers, letting the chrome match your brand. It has no direct ranking effect but is a low-effort polish for mobile UX.
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