FontSizePicker Edit

FontSizePicker is a React component that renders a UI that allows users to select a font size.
The component renders a user interface that allows the user to select predefined (common) font sizes and contains an option that allows users to select custom font sizes (by choosing the value) if that functionality is enabled.


import { FontSizePicker } from '@wordpress/components';
import { useState } from '@wordpress/element';
import { __ } from '@wordpress/i18n';

const fontSizes = [
        name: __( 'Small' ),
        slug: 'small',
        size: 12,
        name: __( 'Big' ),
        slug: 'big',
        size: 26,
const fallbackFontSize = 16;

const MyFontSizePicker = () => {
    const [ fontSize, setFontSize ] = useState( 12 );

    return (
            fontSizes={ fontSizes }
            value={ fontSize }
            fallbackFontSize={ fallbackFontSize }
            onChange={ ( newFontSize ) => {
                setFontSize( newFontSize );
            } }


<MyFontSizePicker />

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The component accepts the following props:

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If true, it will not be possible to choose a custom fontSize. The user will be forced to pick one of the pre-defined sizes passed in fontSizes.

  • Type: Boolean
  • Required: no
  • Default: false

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If no value exists, this prop defines the starting position for the font size picker slider. Only relevant if withSlider is true.

  • Type: Number
  • Required: No

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An array of font size objects. The object should contain properties size, name, and slug.
The property size contains a number with the font size value, in px or a string specifying the font size CSS property that should be used eg: “13px”, “1em”, or “clamp(12px, 5vw, 100px)”.
The name property includes a label for that font size e.g.: Small.
The slug property is a string with a unique identifier for the font size. Used for the class generation process.

Note: The slugs default and custom are reserved and cannot be used.

  • Type: Array
  • Required: No

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A function that receives the new font size value.
If onChange is called without any parameter, it should reset the value, attending to what reset means in that context, e.g., set the font size to undefined or set the font size a starting value.

  • Type: function
  • Required: Yes

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The current font size value.

  • Type: Number | String
  • Required: No

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If true, the UI will contain a slider, instead of a numeric text input field. If false, no slider will be present.

  • Type: Boolean
  • Required: no
  • Default: false

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If true, a reset button will be displayed alongside the input field when a custom font size is active. Has no effect when disableCustomFontSizes or withSlider is true.

  • Type: Boolean
  • Required: no
  • Default: true