Mobile-Friendly Checklist

Free online mobile-friendly checklist — confirming a page genuinely works on phones.

100% Private — Runs entirely in browserInstant calculation & resultFree, no sign-up

Verify your page is genuinely mobile-friendly — the checks that used to be in Google's Mobile-Friendly Test.

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Viewport meta tag present (width=device-width, initial-scale=1)Without it, mobile renders a zoomed-out desktop page.Text at least 16px base size — no pinch-zoom neededGoogle flags illegible font sizes.Tap targets ≥ 48px with spacingPrevents mis-taps.No horizontal scrolling at 360px widthContent wider than the screen fails usability.No intrusive interstitials/popups on entryDirect ranking penalty.Test with Chrome DevTools device emulation AND a real phoneEmulation misses touch/keyboard quirks.Forms use correct input types (email, tel, number)Right mobile keyboard = fewer errors.Media queries cover 360–430px widths firstMost Android/iPhone traffic lands there.

Why follow ToolJiffy Mobile-Friendly Checklist?

Mobile devices account for over 60% of global web traffic, and Google enforces mobile-first indexing for all websites. Pages that suffer from tiny unreadable text, small tap targets, missing viewport meta tags, or broken horizontal scroll layouts deliver poor user experiences and lose mobile search rankings. ToolJiffy Mobile-Friendly Checklist provides an interactive developer roadmap in your browser.

Responsive Viewport Meta Tag Audit: Verifies width=device-width, initial-scale=1.0 viewport configuration.
Touch Target Sizing & Spacing: Ensures buttons and links meet 48px minimum touch dimensions to prevent mis-taps.
Fluid CSS Layout & Media Scaling: Prevents horizontal scrolling by enforcing max-width: 100% on images and tables.
100% On-Device Local Storage State: Progress checkboxes save automatically in browser localStorage without server logins.

Mobile-First Responsive Web Design Engine

ToolJiffy's checklist categorizes mobile web optimizations into viewport setup, media queries, touch interface ergonomics, typography scaling, and mobile page speed tasks.

Whether building mobile web apps, auditing client site responsiveness across phone viewports, or testing CSS breakpoints, structured checklists guarantee seamless mobile user experiences.

Client-side security for private responsive audits

Tracking mobile design progress for unreleased client projects or internal web apps should never require logging progress data on remote servers.

ToolJiffy operates on a zero-cloud architecture. All checklist states remain 100% local in your browser tab. Your audit data never leaves your device.

Step-by-step guide to building a mobile-friendly site

Add viewport tag: Include <meta name="viewport" content="width=device-width, initial-scale=1.0"> in HTML <head>.
Fluid media & containers: Apply img { max-width: 100%; height: auto; } and use CSS Flexbox/Grid layouts.
Optimize touch targets & fonts: Set body font size to 16px+ and ensure buttons have 48px+ touch target height.

Frequently asked questions

How does the Mobile-Friendly Checklist work in browser memory?

ToolJiffy provides an interactive, stateful checklist covering mobile web design standards: responsive viewport meta tags, tap target sizing (48px+), mobile typography scaling, fluid media layouts, and horizontal scroll prevention.

What is mobile-first indexing and why does Google require it?

Google predominantly uses the mobile version of a website`s content for indexing and search ranking. If a web page renders poorly on smartphones, search rankings drop across all devices.

What is the correct viewport meta tag for mobile responsiveness?

The mandatory responsive meta tag is <meta name="viewport" content="width=device-width, initial-scale=1.0"> placed inside the HTML <head> element.

Is my checklist progress saved on any server?

No, 100% private. All checklist checkbox states are saved locally in your browser`s localStorage. Your mobile optimization progress never leaves your computer.

What is the minimum tap target size for mobile buttons and links?

Interactive buttons, links, and form controls should be at least 48x48 CSS pixels with at least 8px spacing to prevent accidental mis-taps.

How do I prevent accidental horizontal scrolling on mobile screens?

Set `max-width: 100%` on images, tables, and embeds, use fluid CSS Flexbox/Grid layouts, and avoid fixed pixel container widths wider than 320px.

What body text font size is recommended for mobile readability?

Use a base font size of at least 16px (`1rem`) for body text to ensure comfortable reading without forcing users to pinch-zoom.

Is ToolJiffy Mobile-Friendly Checklist free without limits?

Yes! ToolJiffy is 100% free with unlimited usages, zero account sign-ups, and zero watermarks.

Explore related developer tools

Test screen viewports with Responsive Screen Tester, follow the Core Web Vitals Checklist, follow the Page Speed Optimization Checklist, or audit accessibility with Accessibility Checker.