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CSS clamp() Generator

Generate a CSS clamp() value for fluid typography or spacing from min and max sizes and a viewport range, with a live preview that scales.

CSS clamp() Generator

CSS value
font-size: clamp(1.0000rem, 0.3333rem + 3.3333vw, 3.0000rem);
Min
1.0000rem
Preferred
0.3333rem + 3.3333vw
Max
3.0000rem
Live preview (resize the window to see it scale)

The quick brown fox jumps over the lazy dog

Updated . Provided as is. Check the output before you rely on it in production.

How to use CSS clamp() Generator

  1. 1

    Set your size range

    Enter the minimum and maximum size you want the text or spacing to reach, choosing px or rem as the unit for those two size fields.

  2. 2

    Define the viewport range

    Set the min and max viewport widths in pixels (commonly 320 and 1280). The size scales linearly between these two breakpoints.

  3. 3

    Review the output and preview

    Read the generated clamp() value plus its min, preferred, and max parts, and watch the live preview text resize as you adjust the inputs.

  4. 4

    Copy into your CSS

    Use the Copy button to grab the clamp() value, then paste it into a font-size, margin, padding, or gap declaration in your stylesheet.

Questions and answers

What is CSS clamp() Generator?
CSS clamp(min, preferred, max) uses the preferred value but never goes below min or above max; with a rem plus vw preferred value, size scales smoothly with the viewport. This generator derives that preferred value from your min and max sizes and viewport widths and shows a preview that scales as you resize.
Is CSS clamp() Generator free?
Yes. It runs entirely in your browser at no cost and without an account, so you can build as many fluid type and spacing values as you need.
Does CSS clamp() Generator store or send my data?
No. The math runs locally in your browser using plain JavaScript. Nothing you enter is uploaded, saved remotely, or shared with any server.
How is the preferred value calculated?
It computes a slope from your size and viewport range, derives a rem intercept plus a vw term, then wraps them in clamp() with your min and max as the bounds.
For AI agents: how to call this tool

Machine-readable contract, endpoints and examples. Humans can ignore this section.

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/css-clamp-generator/

For automation planning, fetch the canonical contract at /api/tool/css-clamp-generator.json.