CSS Clamp Generator
Automatically calculate fluid clamp() function values for responsive design.
Real-time Preview
Fluid Typography
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About this tool
The CSS Clamp Generator is a tool that automatically generates fluid typography and spacing code using the CSS clamp() function, scaling smoothly according to the viewport width.
Simply input the minimum and maximum element sizes and viewport widths, and the optimal clamp() calculation will be generated. You can intuitively check the transition with graphs and real-time previews, and output the code in CSS, CSS variable, or Tailwind CSS formats.
All calculations are processed within your browser, ensuring no data is sent to a server. No account registration is required; use it for free right now.
How to use
Set parameters
Input the minimum and maximum viewport widths and sizes. You can also apply this to properties other than font size (e.g., margin, padding).
Check graph & preview
Visually confirm the size transition across different viewport widths via the graph. Use the preview area to simulate viewport changes and check actual rendering.
Copy the code
Select your preferred format from CSS, CSS Variable, or Tailwind, then click the copy button. Paste it directly into your project.
Glossary
- clamp()
- A CSS comparison function that sets lower and upper bounds in the format
clamp(min, preferred, max). It's a powerful way to achieve smooth fluid sizing in responsive design without media queries. - vw (viewport width)
- A CSS unit equal to 1% of the viewport's width. For example, if the viewport is 1000px wide,
1vwis 10px. It's essential for calculating fluid values tied to the screen width. - rem
- A relative CSS unit based on the root element's (usually
<html>) font size. It is recommended over px to respect users' browser settings and enhance accessibility. - Fluid Typography
- A design technique where font sizes smoothly scale based on viewport width rather than stepping abruptly at specific breakpoints, ensuring optimal readability on any screen size.
- preferred value
- The ideal value specified as the second argument in the
clamp()function. This tool calculates it as a linear function formatted asintercept(rem) + slope × 100(vw), enabling a smooth transition from the minimum to the maximum size.
Technical Details
Fluid typography using the CSS clamp() function is based on the mathematics of a linear function.
Deriving the Formula
Using the minimum size (minSize), maximum size (maxSize), minimum viewport width (minVW), and maximum viewport width (maxVW), the slope and intercept are calculated as follows:
- slope = (maxSize - minSize) / (maxVW - minVW)
- intercept = minSize - slope × minVW
Using these, the preferred value is calculated as intercept(rem) + slope × 100(vw).
Difference from Media Queries
Traditional @media queries cause abrupt, stepwise changes at specific breakpoints. clamp() provides smooth, linear scaling across any viewport width. This drastically reduces the amount of code required and improves maintainability.
FAQ
- Q.Is my data sent to a server?
- No. All calculations are completed entirely within your browser, meaning no data is sent externally. It is completely safe to use.
- Q.Does this work in Internet Explorer?
- No. Internet Explorer does not support the
clamp()function. Please use modern browsers like Chrome, Firefox, Safari, or Edge. - Q.Can I use this for properties other than font-size?
- Yes.
clamp()can be used for any CSS length property, includingpadding,margin,gap, andwidth. You can select the target property to generate the appropriate code. - Q.Why does the output use rem instead of px?
- Using rem is recommended for accessibility. If users increase their default font size in browser settings, px values will ignore it, whereas rem values will scale properly alongside the user's preferences.
- Q.How does the underlying math work?
- It calculates the "slope" and "intercept" of a linear equation using the provided minimum/maximum viewport widths and sizes to generate a
preferred valueusing vw units. This results in proportional scaling between the defined boundaries.
Use Cases
📱Responsive Web Design
Fluidly scale headings and body text from mobile to desktop with just a single line of CSS, eliminating the need for complex media queries.
🧩Design Systems
Centrally manage your entire typography scale using clamp(). Output as CSS variables to integrate them immediately as design tokens across your project.
📏Fluid Spacing
Apply clamp() to padding, margin, and grid gaps to create beautiful layouts that scale proportionately across the whole screen.
🤝Accessibility Compliance
By relying on rem-based output, you respect the user's default browser font size settings, offering a user-friendly and WCAG-compliant responsive design.
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