What are the three values in a clamp() function?

A minimum value, a preferred (fluid, viewport-based) value, and a maximum value — the browser picks whichever of the three actually applies at the current viewport width.

Do I need to manually calculate the preferred value's scaling rate?

No, that's exactly what this tool handles — you set your min and max, and it calculates the correct fluid scaling formula for the preferred value.

Is clamp() well supported across browsers?

Yes, it has broad support across modern browsers for both font-size and general spacing use cases.

Does CSS Clamp() Generator upload my files to a server?

No. CSS Clamp() Generator runs entirely in your browser using on-device processing, your files never leave your device.

CSS Clamp() Generator

Generate a fluid CSS clamp() value for responsive typography and spacing.

Runs in your browser

Minimum size (px)

Maximum size (px)

Minimum viewport (px)

Maximum viewport (px)

CSS output

font-size: clamp(1.000rem, 0.6479rem + 1.5023vw, 2.000rem);

Preview text at this size

About this tool

CSS clamp() lets font size or spacing scale fluidly between a minimum and maximum based on viewport width, but calculating the correct preferred value (the middle argument that controls the scaling rate) involves real math most people don't want to do by hand. This tool generates a fluid CSS clamp() value for responsive typography and spacing, handling that scaling calculation for you so text and spacing scale smoothly across screen sizes.

Frequently asked questions

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