Shows fallback font immediately, swaps when custom font loads. Avoids FOIT (invisible text). Essential for CWV.

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Font Loading Analyzer

Audit @font-face + font loading strategy

Paste HTML head + CSS

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Learn more — how it works, FAQ & guide

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Calculate percentages, increases, decreases & more

Calculate exact age in years, months, days, hours

Body Mass Index — metric and imperial

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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.

Font loading analyzer