Mobile-Friendly Tester
Test mobile-friendliness from HTML. Check viewport meta, font-size readability, tap target spacing, content width, responsive images. Score 0-100, pass/warn/fail per check, recommendations. Mobile preview dimensions, history (localStorage), shareable URL. 100% client-side.
About Mobile-Friendly Tester
Test mobile-friendliness from HTML. Check viewport meta, font-size readability, tap target spacing, content width, responsive images. Score 0-100, pass/warn/fail per check, recommendations. Mobile preview dimensions, history (localStorage), shareable URL. 100% client-side. Everything runs locally in your browser — your data never leaves your device.
How to use
- Enter your input in the tool above.
- Adjust any options to your preference.
- Use the Copy or Download buttons to save the result.
- Everything happens locally — your data never leaves your browser.
FAQ
What does the Mobile-Friendly Tester check?
Five things: (1) viewport meta tag presence and correctness, (2) inline font-size readability (≥16px for body text), (3) tap target density and sizing (≥48×48px), (4) responsive images (srcset/sizes/<picture>), (5) content width (no fixed-width containers >980px).
How is the score calculated?
Each check contributes up to 15-25 points. Maximum possible is 90 (viewport 25 + fonts 20 + tap 15 + images 15 + width 15), scaled to 100. Fail on any check drops the overall rating to warn or fail depending on score.
What does the tool look at in my HTML?
It scans for: <meta name='viewport'>, inline font-size CSS declarations, <a>/<button> elements with width/height attributes, <img> elements with srcset/sizes, <picture> elements, and fixed pixel widths in inline styles. It does NOT execute JavaScript or follow external CSS — so inline styles are the most reliable signal.
What are the recommended thresholds?
Viewport: width=device-width, initial-scale=1. Font size: ≥16px body text. Tap targets: ≥48×48px (Apple HIG) with ≥8px spacing. Images: srcset + sizes for responsive delivery. Content: max-width 980px or use relative units (%/vw).
What extra features does this tool have compared to others?
(1) Viewport meta check. (2) Font size analysis. (3) Tap target detection. (4) Image responsive check (srcset/sizes/picture). (5) Content width check (fixed widths >980px). (6) Overall 0-100 score. (7) Pass/warn/fail per check. (8) Recommendations. (9) Mobile preview device dimensions reference. (10) History (localStorage, last 20). (11) Shareable URL.
Is my data sent anywhere?
No. All HTML parsing runs locally. History is stored in localStorage on this device only.
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