Modular Type Scale Generator — CSS Typography & Font Sizing

Typography is the invisible backbone of every great web design. When font sizes jump arbitrarily from heading to heading, the visual hierarchy feels broken — users can't intuitively scan the page and extract meaning. The solution is a modular type scale: a mathematically harmonious sequence of font sizes derived from a single base value and a fixed ratio. Our free Postsize Font Maker generates a complete, production-ready CSS type scale with custom variables and Tailwind config output so your entire typographic system is consistent, scalable, and aesthetically pleasing from day one.

What Is a Modular Type Scale?

A modular type scale applies a single multiplication ratio consistently across every font size step. For example, using a Major Third ratio of 1.25 with a 16px base produces: 16px → 20px → 25px → 31.25px → 39.06px → 48.83px. Each step is exactly 1.25× the previous one, creating a natural visual rhythm that feels professional even if the viewer can't consciously articulate why.

Classic type scale ratios — named after musical intervals — include Minor Second (1.067), Minor Third (1.2), Major Third (1.25), Perfect Fourth (1.333), Augmented Fourth (1.414), Perfect Fifth (1.5), and the dramatic Golden Ratio (1.618). Choosing the right ratio depends on the nature of your application: content-heavy editorial sites often benefit from a subtle Minor Third, while bold marketing pages can leverage a Perfect Fifth for dramatic heading contrast.

Export CSS Custom Properties Instantly

Our tool generates CSS variable declarations (custom properties) that you can drop directly into your project's stylesheet. Variables like --text-sm, --text-base, --text-lg, --text-xl, through to --text-5xl give every developer on your team a consistent naming convention backed by mathematically calculated values — eliminating the ad hoc font-size decisions that slowly fragment a design system.

Google Fonts integration means you can preview the chosen scale immediately with any Google Font family — from the minimal elegance of Inter to the authoritative weight of Playfair Display — before committing to your production codebase. This live preview surface dramatically reduces the back-and-forth between designers and developers during the handoff phase.

Tailwind CSS Config Output

Tailwind CSS projects define their font size scale in tailwind.config.js under the theme.fontSize key. Our tool generates the exact JavaScript object you need to extend Tailwind's default scale with your custom values — saving the tedious manual conversion from pixels to rem and the configuration boilerplate. Simply copy the generated config block and paste it into your project's Tailwind configuration file.

Maintaining a custom Tailwind type scale ensures that your design tokens remain single-sourced. When a product decision requires shifting the base size from 16px to 18px, you change one value in the generator, export a new config block, and every size across the entire application scales harmoniously — no hunting through component files for hardcoded pixel values.

Frequently Asked Questions (FAQ)