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Typography is the art and technique of arranging type to make written language legible and appealing.
The CSS Clamp() Generator is a tool that automatically generates responsive font sizes (fluid typography) using the CSS clamp() function, which smoothly scales based on viewport width.
Simply input the minimum and maximum font sizes and viewport widths, and the tool will calculate the optimal clamp() formula. Visualize the scaling with an interactive graph and real-time text preview. Supports CSS variable and Tailwind CSS code output.
All calculations are performed in your browser — no data is sent to any server. No registration required, completely free to use.
Set Parameters
Adjust the minimum and maximum viewport widths and font sizes using the sliders. You can also customize the root font size for rem calculations.
Check Graph & Preview
The scaling graph visualizes how font size changes across viewport widths. Use the preview area to simulate different viewport widths and see the actual text appearance.
Copy Code
Choose your preferred format — CSS, CSS Variable, or Tailwind — and click the 📋 button to copy. Paste directly into your project.
- clamp()
- A CSS comparison function in the form
clamp(min, preferred, max)that sets lower and upper bounds for a value. If the preferred value is below min, min is used; if above max, max is used. - vw (viewport width)
- A CSS unit equal to 1% of the viewport width. For example,
1vw= 9.6px on a 960px-wide screen. - rem
- A CSS relative unit based on the root element's (
<html>) font size. The default is1rem = 16px. - Fluid Typography
- A design technique where font sizes scale smoothly with viewport width, rather than changing in steps via media queries.
- Preferred Value
- The second argument of
clamp(), calculated asintercept(rem) + slope × 100(vw). - Viewport
- The visible area of a web page in the browser, which varies depending on device and window size.
Fluid typography with CSS clamp() is based on linear function principles.
Formula Derivation
From the minimum font size (minFS), maximum font size (maxFS), minimum viewport width (minVW), and maximum viewport width (maxVW), the slope and intercept are calculated:slope = (maxFS - minFS) / (maxVW - minVW)intercept = minFS - slope × minVW
The preferred value is expressed as intercept(rem) + slope × 100(vw).
Compared to Media Queries
Traditional @media queries create discontinuous jumps in font size at each breakpoint. With clamp(), text scales smoothly across all viewport widths, eliminating the need for multiple media queries and significantly reducing CSS complexity.
- Q. Is any data sent to a server?
- A. No. All calculations are performed entirely in your browser. No data is ever transmitted.
- Q. Does it work on mobile?
- A. Yes. The tool is fully responsive and works on smartphones and tablets.
- Q. Does clamp() work in IE?
- A. No. Internet Explorer does not support clamp(). All modern browsers (Chrome, Firefox, Safari, Edge) fully support it.
- Q. Can I use clamp() for things other than font-size?
- A. Yes. clamp() works with any CSS length property: padding, margin, gap, width, and more.
- Q. Should I use rem or px?
- A. rem is recommended for accessibility. It respects users' browser font size settings and scales appropriately.
- Q. How does the calculation work?
- A. It computes the slope and intercept from min/max font sizes and viewport widths, then generates a preferred value using vw units.
- Q. Is this tool free?
- A. Yes. Completely free with no usage limits.
Responsive Web Design
Create fluid headings and body text that scale smoothly from mobile to desktop with a single CSS declaration. No more media query management.
Design Systems
Manage your entire typography scale with clamp(). Export as CSS variables for use as design tokens in your system.
Fluid Spacing
Apply clamp() not just to fonts but also to padding, margins, and gaps for proportional scaling across the entire layout.
Accessibility
rem-based output respects user font size preferences. Build responsive designs that comply with WCAG guidelines.
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