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Responsive Text CSS Generator - Online Fluid Typography

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Typography Settings
Enter a positive number
Enter a positive number
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1rem = ? px
Live Preview
800px
The quick brown fox jumps over the lazy dog
Current computed size: 20.00px
Generated CSS 
font-size: clamp(16px, 16px + 8 * ((100vw - 320px) / 880), 24px);

Fluid Typography FAQ

Fluid typography smoothly scales text between a defined minimum and maximum font size based on the viewport width. Instead of setting fixed breakpoints, the text size adjusts dynamically using CSS functions like clamp().

clamp(min, preferred, max) selects a value between a defined minimum and maximum. The preferred value is typically a calculation involving viewport units (vw), allowing the font size to scale fluidly. Example: clamp(1rem, 2.5vw, 2rem).

Common choices are 320px (small mobile) for min viewport and 1200px (wide desktop) for max viewport. Adjust these to match your design’s breakpoints or target audience devices.

Modern browsers allow combining units inside calc(). It’s perfectly valid to use 100vw - 320px alongside rem values. This generator produces clean, standard-compliant CSS that works in all modern browsers.

Absolutely. The same fluid formula can be applied to line-height, margin, padding, or any numeric property. Just replace the min/max values with your desired limits.

The clamp() function and unit mixing inside calc() are supported in all modern browsers (Chrome, Firefox, Safari, Edge) with global coverage of over 95%. Older browsers will ignore the rule and fall back to the first defined size before the clamp().
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