Skip to content

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

What This Tool Does

CSS clamp() Generator is built for deterministic developer and agent workflows.

Generate a CSS clamp() value for fluid, responsive typography or spacing from min/max sizes and a viewport range.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

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.

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.

Frequently Asked Questions

What is CSS clamp() Generator?
It is a browser tool that builds a CSS clamp() value for fluid typography or spacing, interpolating linearly between a minimum and maximum size across a viewport range.
How do I use CSS clamp() Generator?
Enter your min and max size, the min and max viewport widths, and a base rem. The tool outputs a ready-to-paste clamp() value with a live preview that scales.
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.