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Mobile Responsive Checker

Evaluate HTML against a comprehensive responsive design quality checklist. Checks viewport configuration, CSS breakpoints, flexible layouts, images, typography, touch targets, and more.

Drop an .html file here or
Responsive page Non-responsive page Partially responsive

How It Works

This tool parses your HTML and evaluates it against a comprehensive mobile responsive design quality checklist. All processing happens entirely in your browser — no data is sent to any server.

Checklist Categories
  • Viewport & Meta — Viewport tag, DOCTYPE, charset, and zoom settings
  • Layout & Structure — Flexible containers, fixed-width elements, CSS Grid/Flexbox usage
  • Media Queries — Presence and range of responsive CSS breakpoints
  • Images & Media — Responsive images, srcset, picture elements, lazy loading
  • Typography — Base font sizes, relative units, readable line lengths
  • Touch & Interaction — Touch target sizing, spacing, hover-only patterns
  • Performance — Render-blocking resources, inline critical CSS, preload hints
  • Accessibility — Language attribute, focus styles, ARIA landmarks
Scoring

Each check is weighted equally. Passes score full points, warnings half, and failures zero. The final percentage determines the grade:

ScoreGrade
80 – 100%Responsive-ready
50 – 79%Needs improvement
0 – 49%Not responsive
Tip: This checklist analyzes static HTML source. For a complete audit, also test on real devices and measure Core Web Vitals.

Embed This Util

You can embed this util on your own site as a widget. Adding ?embed=1 to the URL loads a compact version with just the tool itself; no header, menu, or documentation. Paste this snippet into your HTML: 


    

       Copy snippet
      Adjust the height to taste.
    

  









  
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       Mobile-Friendly Test
       HTML Validator
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