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CSS Clamp Generator

A fluid clamp() value for font-size, spacing or any size property, scaling between two viewport widths -- with a simulated-viewport slider so you can see the exact interpolated value at any width without resizing the window. Presets, randomize, and export to CSS, Tailwind, SCSS or React.

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What this tool does

Builds a fluid clamp(min, preferred, max) value — the modern way to scale font size, spacing, or any dimension smoothly with viewport width instead of jumping between fixed sizes at media-query breakpoints — by computing the correct slope-and-intercept vw formula from two size/ viewport pairs.

The math, done for you

Given a minimum size at a minimum viewport width and a maximum size at a maximum viewport width, the tool derives the linear equation between them and expresses it as the calc()-free Xpx + Yvw preferred value clamp() actually needs — the same calculation that's easy to get wrong doing it by hand.

Simulating any viewport width

A simulated-viewport slider shows the exact interpolated value at any width between (and beyond) the min/max bounds, with a live numeric readout and a real preview element sized or scaled to match — so a specific breakpoint's value can be checked without actually resizing the browser window.

Works for more than font-size

Seven properties are supported — font-size, padding, width, height, gap, line-height, and letter-spacing — with the preview adapting to show text, a sized box, or spaced chips depending on which property is selected.

Presets and randomizing

Five presets — H1 Heading, Body Text, Section Padding, Card Gap, and Container Width — cover common fluid-sizing needs, plus a randomize button for quick exploration.

Getting the CSS out

Export as plain CSS, a Tailwind arbitrary-value class, SCSS, or a React inline style object, copyable with one click.

Privacy

Everything runs locally in your browser -- nothing you build is sent to a server.

FAQ

Frequently asked questions

Is my data uploaded anywhere?
No. The clamp() value is calculated and previewed entirely in the browser -- nothing is sent to a server.
How does the tool figure out the vw coefficient?
It treats the min size at the min viewport and the max size at the max viewport as two points on a line, then solves for that line's slope and intercept -- the standard fluid-typography formula, done automatically instead of by hand.
Can I see the value at a specific viewport width without resizing my browser?
Yes -- the simulated-viewport slider shows the exact interpolated value and a live preview at any width, including widths outside the min/max range (where the value stays clamped at its floor or ceiling).
Does this only work for font-size?
No -- padding, width, height, gap, line-height, and letter-spacing are all supported, with the preview showing text, a sized box, or spaced chips depending on which property is chosen.
What happens outside the min/max viewport range?
The value stays clamped at its minimum below the min viewport width and at its maximum above the max viewport width -- that's the entire point of clamp() over a raw linear vw calculation, which would keep growing or shrinking indefinitely.
What export formats are available?
Plain CSS, a Tailwind arbitrary-value class, SCSS, or a React inline style object -- selectable from a dropdown next to the code output.
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