👉🏻 tailwindcss-fluid-type

A plugin that makes the use of Fluid Type a breeze.

👉🏻 Installation

Install the plugin from npm:

# Using npm
npm install tailwindcss-fluid-type

# Using Yarn
yarn add tailwindcss-fluid-type

Then add the plugin to your tailwind.config.js file and do your settings if you're not happy with the defaults:

// tailwind.config.js
module.exports = {
  // You can disable the fontSize core plugin if you don't need non fluid font sizes.
  // If you don't disable it, the fluid-type plugin simply overrule the default font-sizes if the keys are the same.
  // Or you can use both alongside when you set an prefix in the settings
  corePlugins: {
    fontSize: false,
    // ...
  },
  plugins: [
    require("tailwindcss-fluid-type"),
    // ...
  ],
};

👉🏻 Usage

Nothing changed here to the default tailwindcss configuration:

<article>
  <h1 class="text-xl">Fluid type</h1>
</article>

👉🏻 Configuration

The plugin comes with a default configuration (see below) but it's possible to customize this config for your project. As default, we use rem for better accessibility, but you can also use px.

Important Note:
If you set values you have to set all values that you need for your font-sizes. There is no value merging here.

Default configuration

// tailwind.config.js
module.exports = {
  plugins: [
    require("tailwindcss-fluid-type")({
      // your fluid type settings
      // works only with unitless numbers
      // This numbers are the defaults settings
      settings: {
        fontSizeMin: 1.125, // 1.125rem === 18px
        fontSizeMax: 1.25, // 1.25rem === 20px
        ratioMin: 1.125, // Multiplicator Min
        ratioMax: 1.2, // Multiplicator Max
        screenMin: 20, // 20rem === 320px
        screenMax: 96, // 96rem === 1536px
        unit: "rem", // default is rem but it's also possible to use 'px'
        prefix: "", // set a prefix to use it alongside the default font sizes
        extendValues: true, // When you set extendValues to true it will extend the default values. Set it to false to overwrite the values.
      },
      // Creates the text-xx classes
      // This are the default settings and analog to the tailwindcss defaults
      // Each `lineHeight` is set unitless and we think that's the way to go especially in context with fluid type.
      values: {
        xs: [-2, 1.6],
        sm: [-1, 1.6],
        base: [0, 1.6],
        lg: [1, 1.6],
        xl: [2, 1.2],
        "2xl": [3, 1.2],
        "3xl": [4, 1.2],
        "4xl": [5, 1.1],
        "5xl": [6, 1.1],
        "6xl": [7, 1.1],
        "7xl": [8, 1],
        "8xl": [9, 1],
        "9xl": [10, 1],
      },
    }),
  ],
  variants: {
    fluidType: ["responsive"],
  },
};

Fluid type configuration without lineHeight

It is also possible to set just the fontSize without set the lineHeight

// tailwind.config.js
module.exports = {
  plugins: [
    require("tailwindcss-fluid-type")({
      values: {
        // ...
        base: 0,
        // ...
      },
    }),
  ],
};

Fluid type configuration with lineHeight & letterSpacing

And yes, you can also set the letterSpacing & lineHeight as you know from the tailwind documentation. letterSpacing can be all values that you like.

// tailwind.config.js
module.exports = {
  plugins: [
    require("tailwindcss-fluid-type")({
      values: {
        // ...
        base: [
          0,
          {
            lineHeight: 1.6,
            letterSpacing: "-0.1rem",
          },
        ],
        // ...
      },
    }),
  ],
};

👉🏻 Samples

Just set the fontSize property

// tailwind.config.js
module.exports = {
  plugins: [
    require("tailwindcss-fluid-type")({
      settings: {
        fontSizeMin: 1.125,
        fontSizeMax: 1.25,
        ratioMin: 1.125,
        ratioMax: 1.2,
        screenMin: 20,
        screenMax: 96,
        unit: "rem",
        prefix: "",
      },
      values: {
        // ...
        base: 0,
        // ...
      },
    }),
  ],
};

<p class="text-base">The quick brown fox jumps over the lazy dogs</p>

.text-base {
  font-size: clamp(
    1.125rem,
    calc(1.125rem + (1.25 - 1.125) * ((100vw - 20rem) / (96 - 20))),
    1.25rem
  );
}

Set the fontSize & lineHeight property

// tailwind.config.js
module.exports = {
  plugins: [
    require("tailwindcss-fluid-type")({
      settings: {
        fontSizeMin: 1.125,
        fontSizeMax: 1.25,
        ratioMin: 1.125,
        ratioMax: 1.2,
        screenMin: 20,
        screenMax: 96,
        unit: "rem",
        prefix: "",
      },
      values: {
        // ...
        base: [0, 1.6],
        // ...
      },
    }),
  ],
};

<p class="text-base">The quick brown fox jumps over the lazy dogs</p>

.text-base {
  font-size: clamp(
    1.125rem,
    calc(1.125rem + (1.25 - 1.125) * ((100vw - 20rem) / (96 - 20))),
    1.25rem
  );
  line-height: 1.6;
}

Set the fontSize, lineHeight & letterSpacing property

// tailwind.config.js
module.exports = {
  plugins: [
    require("tailwindcss-fluid-type")({
      settings: {
        fontSizeMin: 1.125,
        fontSizeMax: 1.25,
        ratioMin: 1.125,
        ratioMax: 1.2,
        screenMin: 20,
        screenMax: 96,
        unit: "rem",
        prefix: "",
      },
      values: {
        // ...
        base: [
          0,
          {
            lineHeight: 1.6,
            letterSpacing: "-0.1rem",
          },
        ],
        // ...
      },
    }),
  ],
};

<p class="text-base">The quick brown fox jumps over the lazy dogs</p>

.text-base {
  font-size: clamp(
    1.125rem,
    calc(1.125rem + (1.25 - 1.125) * ((100vw - 20rem) / (96 - 20))),
    1.25rem
  );
  line-height: 1.6;
  letter-spacing: -0.1rem;
}

Set a value as string

// tailwind.config.js
module.exports = {
  plugins: [
    require("tailwindcss-fluid-type")({
      values: {
        // ...
        "2xs": "11px",
        // ...
      },
    }),
  ],
};

<p class="text-2xs">The quick brown fox jumps over the lazy dogs</p>

.text-2xs {
  font-size: 11px;
}

Set a prefix

// tailwind.config.js
module.exports = {
  plugins: [
    require("tailwindcss-fluid-type")({
      settings: {
        // ...
        prefix: "fluid-",
      },
    }),
  ],
};

<p class="fluid-text-base">The quick brown fox jumps over the lazy dogs</p>

.fluid-text-base {
  font-size: clamp(
    1.125rem,
    calc(1.125rem + (1.25 - 1.125) * ((100vw - 20rem) / (96 - 20))),
    1.25rem
  );
  line-height: 1.6;
  letter-spacing: -0.1rem;
}

👉🏽 Compability with Tailwind Merge

To ensure compabibility with tailwind-merge, extends it's configuration to recognize fluid-text sizes. This enables seamless overriding and filtering of tailwind classes with tailwind-merge utility.

import { type ClassValue, clsx } from "clsx";
import { extendTailwindMerge } from "tailwind-merge";

const twMerge = extendTailwindMerge({
  extend: {
    classGroups: {
      "font-size": [
        {
          "fluid-text": ["sm", "base", "lg", "xl", "2xl", "3xl", "4xl", "5xl", "6xl", "7xl", "8xl", "9xl",
          ],
        },
      ],
    },
  },
});


export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

Overwrite default line-height

Sometimes it may be useful to override the default line height that you set in your config. Therefore, this plugin supports the Tailwind font size line-height shorthand. This works as follows.

<h1 class="text-9xl/snug">The quick brown fox jumps over the lazy dogs</h1>

See the official Tailwind documentation for more information.

👉🏻 Live Demo

Fluid Type Live Demo