CSS Clamp / Responsive Font Size Generator
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Generate fluid typography and spacing with CSS clamp(). Set a min and max size and your viewport range, then copy a clamp() value that scales smoothly across every screen, no media queries needed.
rem
rem
px
px
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Runs in your browser. Nothing is uploaded.
How Fluid Type Is Calculated
- Two anchor points, your min size at the min viewport and max size at the max viewport.
- Find the slope, the change in size divided by the change in viewport width gives a vw value.
- Find the intercept, a fixed rem term keeps text zoomable and accurate.
- Wrap in clamp(), the min and max bounds stop the size going too small or too large.
Why Fluid Type Helps
- Fewer media queries, one clamp() replaces several breakpoint rules.
- Looks right everywhere, type scales continuously instead of jumping.
- Accessible, a rem component keeps text zoomable for users who need it.
- Cleaner CSS, less code to maintain and fewer edge cases to test.
Next steps
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CSS Clamp Generator: FAQ
What does the CSS clamp generator do?
It builds a CSS clamp() value for fluid, responsive typography and spacing. You set a minimum size, a maximum size, and the viewport range, and it outputs a clamp() expression that scales smoothly between your breakpoints without media queries.
How does clamp() work?
clamp(min, preferred, max) returns the preferred value but never smaller than min or larger than max. For fluid type the preferred value is a formula based on the viewport width, so text grows as the screen widens and then locks at your maximum.
Why use fluid typography instead of breakpoints?
Fluid type scales continuously, so it looks right at every width instead of jumping at fixed breakpoints. It reduces the number of media queries you maintain and avoids awkward in-between sizes on tablets and large phones.
What units should I use, px or rem?
The tool can output rem for accessibility, which respects the user browser font-size setting, or px if you prefer absolute control. rem is generally recommended for font sizes so the design scales with user preferences.
What is the preferred value formula?
It is a linear equation, value equals slope times viewport width plus intercept, derived from your two size and width pairs. The tool calculates the slope in vw and the rem intercept so the size hits your min at the small width and your max at the large width.
Does it prevent zoom accessibility issues?
Using rem in the preferred value keeps an absolute rem component so users can still zoom text, which avoids the WCAG issue caused by viewport-only units. The generator includes a rem term for this reason.
Is the output ready to paste?
Yes. Copy the clamp() value directly into any font-size, padding, margin, gap, or width property. It works in all modern browsers.
Is this CSS clamp tool free?
Yes. It is free, private, runs in your browser, and needs no signup.
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