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CSS Clamp Font Size Generator
Create Responsive Typography with Fluid Font Scaling & Live Preview
Create perfectly responsive typography with our advanced CSS Clamp Generator. Calculate fluid font sizes that automatically scale based on viewport width, ensuring optimal readability across all devices. Perfect for modern websites, design systems, and responsive layouts that demand typographic excellence.
📱 Truly Responsive
Text that scales perfectly from mobile to desktop without breakpoints
🔄 Live Preview
See your typography scale in real-time with interactive slider
📏 Precise Control
Set minimum, preferred, and maximum font sizes with px/rem units
⚡ Copy-Ready Code
Get clean CSS code instantly for your projects
🎯 Modern CSS
Uses cutting-edge clamp() function for future-proof designs
🚀 Performance
Eliminates multiple media queries for cleaner, faster CSS
✨ Advanced Features
About CSS Clamp for Responsive Typography
The clamp() function in CSS is a powerful tool for creating fluid typography that responds perfectly to different screen sizes. It takes three parameters: a minimum value, a preferred value (which can include viewport units for scaling), and a maximum value.
Using clamp() ensures your text stays within readable sizes while still scaling smoothly between viewport widths, eliminating the need for numerous media queries and creating a more polished user experience.
Basic Syntax
The preferred value typically includes a viewport unit (vw) to create the fluid scaling effect.
Practical Example
This sets font size to minimum 1rem, maximum 3rem, with fluid scaling in between.
Our generator calculates the optimal formula based on your desired minimum and maximum font sizes across specific viewport ranges, giving you production-ready CSS code with perfectly smooth scaling.
Font-Size Clamp Generator
Viewport Settings
Font Size Settings
Live Preview
Responsive Heading
Secondary Heading
This is sample paragraph text that demonstrates how your font scaling will look across different viewport sizes. The text will resize smoothly as you adjust the viewport width slider above.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco.
Generated CSS Code
font-size: clamp(1rem, 0.5rem + 2vw, 1.5rem);
font-size: clamp(1rem, calc(0.5rem + 2vw), 1.5rem);
.responsive-text {
font-size: clamp(1rem, 0.5rem + 2vw, 1.5rem);
}
font-size: clamp(1rem, calc(0.5rem + 2vw), 1.5rem);
@mixin responsive-font-size() {
font-size: clamp(1rem, calc(0.5rem + 2vw), 1.5rem);
}
// Usage:
.text-element {
@include responsive-font-size();
}
@function fluid-font-size() {
@return clamp(1rem, calc(0.5rem + 2vw), 1.5rem);
}
// Usage:
.text-element {
font-size: fluid-font-size();
}
:root {
--font-size-min: 1rem;
--font-size-max: 1.5rem;
--font-size-fluid: clamp(var(--font-size-min), 0.5rem + 2vw, var(--font-size-max));
}
.text-element {
font-size: var(--font-size-fluid);
}
:root {
--text-body: clamp(1rem, 0.5rem + 2vw, 1.5rem);
--text-heading: clamp(1.5rem, 1rem + 3vw, 2.5rem);
--text-small: clamp(0.875rem, 0.5rem + 1.5vw, 1rem);
}
.body-text { font-size: var(--text-body); }
.heading { font-size: var(--text-heading); }
.small-text { font-size: var(--text-small); }
// Typography Variables
$font-size-min: 1rem;
$font-size-max: 1.5rem;
$font-size-fluid: clamp(#{$font-size-min}, calc(0.5rem + 2vw), #{$font-size-max});
.text-element {
font-size: $font-size-fluid;
}
// Design System Variables
$color-primary: #007bff;
$color-secondary: #6c757d;
$color-text: #495057;
$font-size-min: 1rem;
$font-size-max: 1.5rem;
$font-size-fluid: clamp(#{$font-size-min}, calc(0.5rem + 2vw), #{$font-size-max});
// Component Styles
.text-primary {
font-size: $font-size-fluid;
color: $color-primary;
}
.text-secondary {
font-size: $font-size-fluid;
color: $color-secondary;
}
// Typography Scale Map
$typography-scale: (
'xs': clamp(0.75rem, calc(0.5rem + 1vw), 0.875rem),
'sm': clamp(0.875rem, calc(0.5rem + 1.5vw), 1rem),
'base': clamp(1rem, calc(0.5rem + 2vw), 1.5rem),
'lg': clamp(1.125rem, calc(0.75rem + 2.5vw), 1.75rem),
'xl': clamp(1.25rem, calc(1rem + 3vw), 2rem),
'xxl': clamp(1.5rem, calc(1.25rem + 4vw), 3rem)
);
// Helper Function
@function font-size($size) {
@return map-get($typography-scale, $size);
}
// Usage Examples
.text-small { font-size: font-size('sm'); }
.text-body { font-size: font-size('base'); }
.text-heading { font-size: font-size('xl'); }
Ready-to-Use Examples
Typography Hierarchy
/* Responsive Typography Hierarchy */
h1 { font-size: clamp(1.75rem, calc(1.5rem + 4vw), 3rem); }
h2 { font-size: clamp(1.5rem, calc(1.25rem + 3vw), 2.5rem); }
h3 { font-size: clamp(1.25rem, calc(1rem + 2.5vw), 2rem); }
h4 { font-size: clamp(1.125rem, calc(0.875rem + 2vw), 1.5rem); }
h5 { font-size: clamp(1rem, calc(0.75rem + 1.5vw), 1.25rem); }
h6 { font-size: clamp(0.875rem, calc(0.75rem + 1vw), 1rem); }
body { font-size: clamp(1rem, calc(0.875rem + 1vw), 1.125rem); }
Button & Form Elements
/* Responsive Component Sizes */
.btn {
font-size: clamp(0.875rem, calc(0.75rem + 1vw), 1rem);
padding: clamp(0.5rem, calc(0.375rem + 1vw), 0.75rem) clamp(1rem, calc(0.75rem + 2vw), 1.5rem);
}
.form-control {
font-size: clamp(0.875rem, calc(0.75rem + 1vw), 1rem);
padding: clamp(0.375rem, calc(0.25rem + 1vw), 0.625rem);
}
.card-title {
font-size: clamp(1.125rem, calc(0.875rem + 2vw), 1.5rem);
}
.badge {
font-size: clamp(0.75rem, calc(0.625rem + 0.5vw), 0.875rem);
}
Utility Classes
/* Responsive Utility Classes */
.text-xs { font-size: clamp(0.625rem, calc(0.5rem + 0.75vw), 0.75rem); }
.text-sm { font-size: clamp(0.75rem, calc(0.625rem + 1vw), 0.875rem); }
.text-base { font-size: clamp(0.875rem, calc(0.75rem + 1.25vw), 1rem); }
.text-lg { font-size: clamp(1rem, calc(0.875rem + 1.5vw), 1.25rem); }
.text-xl { font-size: clamp(1.125rem, calc(1rem + 2vw), 1.5rem); }
.text-2xl { font-size: clamp(1.25rem, calc(1.125rem + 2.5vw), 2rem); }
.text-3xl { font-size: clamp(1.5rem, calc(1.25rem + 3vw), 2.5rem); }
/* Responsive Spacing */
.p-fluid { padding: clamp(1rem, calc(0.5rem + 2vw), 2rem); }
.m-fluid { margin: clamp(0.5rem, calc(0.25rem + 1vw), 1rem); }
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