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Responsive Font Size

Bootstrap Responsive Font Size

Note: This documentation is for an older version of Bootstrap (v.4). A newer version is available for Bootstrap 5. We recommend migrating to the latest version of our product - Material Design for Bootstrap 5.
Go to docs v.5

RFS (simply the abbreviation for Responsive Font Size) is a font size engine which automatically calculates the appropriate font size based on the dimensions of the browser viewport.

How does it work?

  • Font sizes will rescale for every screen or device, this prevents long words from being chopped off the viewport on small devices
  • RFS will prevent the font size from rescaling too small so readability can be assured
  • Super easy to use, just use the font-size mixin (or responsive-font-size property for PostCSS) instead of the font-size property
  • The font sizes of all text elements will always remain in relation with each other

Note warning: Remember to add your SCSS code to the _custom-styles.scss file.

Basic example

Below, we show an example of article with responsive title and other content. Please, resize the browser window to see an effect.

The responsive-font-size mixin

Automated font-size rescaling with SCSS

2017/12/21
This text automatically rescales thanks to the RFS mixin. It uses the RFS algorithm to automatically calculate the appropriate font size based on the dimensions of the monitor or device.

PostCSS alternative

A PostCSS plugin is available which uses the responsive-font-size property.

Disable responsive font-size

Responsive font-sizing can be disabled within an element by adding the .disable-responsive-font-size class

Lorem ipsum text

No demo without Lorem ipsum text. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Provident tenetur delectus fuga et, doloribus rerum! Aperiam voluptate mollitia rerum necessitatibus repudiandae asperiores doloremque deleniti praesentium, dolorem maxime, quia, libero. Maiores? Lorem ipsum dolor sit amet, consectetur adipisicing elit. Iste distinctio quidem, obcaecati aperiam! Distinctio porro pariatur labore veniam deserunt mollitia consectetur unde voluptatem blanditiis eaque aperiam, sequi sed vero debitis!


        <h1 class="title h1 my-4">The responsive-font-size mixin</h1>
        <article class="article">
          <h2 class="article__title">Automated font-size rescaling with SCSS</h2>
          <div class="article__date">2017/12/21</div>
          <div class="article__content">This text automatically rescales thanks to the <a href="https://github.com/MartijnCuppens/postcss-rfs">RFS
              mixin</a>. It uses the RFS algorithm to automatically calculate the appropriate font size based on the dimensions
            of the monitor or device.
          </div>
        </article>
        <article class="article">
          <h2 class="article__title">PostCSS alternative</h2>
          <div class="article__content">A <a href="https://github.com/MartijnCuppens/postcss-rfs" target="_blank">PostCSS
              plugin</a> is available which uses the "responsive-font-size" property.</div>
        </article>
        <article class="article">
          <h2 class="article__title">RFS in Bootstrap?</h2>
          <div class="article__content">Currenty there is an open feature-request to put RFS in Bootstrap: <a href="https://github.com/twbs/bootstrap/issues/23053">Responsive
              font sizes</a>. The result of RFS in Bootstrap is shown on <a href="http://martijncuppens.github.io/rfs/">the
              bootstrap RFS demo site</a>.</div>
        </article>
        <article class="article disable-responsive-font-size">
          <h2 class="article__title">Disable responsive font-size</h2>
          <div class="article__content">Responsive font-sizing can be disabled within an element by adding the ".disable-responsive-font-size"
            class</div>
        </article>
        <article class="article">
          <h2 class="article__title">Lorem ipsum text</h2>
          <div class="article__content">No demo without Lorem ipsum text. Lorem ipsum dolor sit amet, consectetur adipisicing
            elit. Provident tenetur delectus fuga et, doloribus rerum! Aperiam voluptate mollitia rerum necessitatibus
            repudiandae asperiores doloremque deleniti praesentium, dolorem maxime, quia, libero. Maiores? Lorem ipsum dolor
            sit amet, consectetur adipisicing elit. Iste distinctio quidem, obcaecati aperiam! Distinctio porro pariatur labore
            veniam deserunt mollitia consectetur unde voluptatem blanditiis eaque aperiam, sequi sed vero debitis!</div>
        </article>

      


        @import "core/bootstrap/rfs";

        .title {
          @include responsive-font-size(4rem);
          margin: 0 0 .5em;
        }
        .article {
          background: white;
          box-shadow: 0 0 10px rgba(black, .25);
          padding: 20px 25px;
          
          &:not(:first-of-type) {
            margin-top: 20px;
          }
          
          &__title {
            @include responsive-font-size(27px);
            margin: 0;
          }
          
          &__date {
            padding-top: .25em;
            @include responsive-font-size(12);
            opacity: .75;
            font-style: italic;
          }
          
          &__content {
            padding-top: .75em;
            @include responsive-font-size(16);
            margin: 0;
            line-height: 1.4;
          }
        }
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Getting started: download & setup

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If you need additional help with compiling your custom package, please use our Compilation & Customization tutorial.

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Map of dependencies of SCSS files in MDBootstrap:


    Legend:

    '-->' means 'required'

    All free and pro files require files from 'core' catalog

    'none' means 'this component doesn't require anything except core files'

    A file wrapped by `< >` means that this file make the base component prettier but it isn't necessary for the proper working

    All PRO components require 'pro/_variables.scss' file

    scss/
    |
    |-- core/
    |   |
    |   |-- bootstrap/
    |   |	|-- _functions.scss
    |   |	|-- _variables.scss
    |   |
    |   |-- _colors.scss
    |   |-- _global.scss
    |   |-- _helpers.scss
    |   |-- _masks.scss
    |   |-- _mixins.scss
    |   |-- _typography.scss
    |   |-- _variables.scss
    |   |-- _waves.scss
    |
    |-- free/
    |   |-- _animations-basic.scss --> none
    |   |-- _animations-extended.scss --> _animations-basic.scss
    |   |-- _buttons.scss --> none
    |   |-- _cards.scss --> none <_buttons.scss>
    |   |-- _dropdowns.scss --> none <_buttons.scss>
    |   |-- _input-group.scss --> _forms.scss, _buttons.scss, _dropdowns.scss
    |   |-- _navbars.scss --> none <_buttons.scss, _forms.scss, _input-group.scss>
    |   |-- _pagination.scss --> none
    |   |-- _badges.scss --> none
    |   |-- _modals.scss --> _buttons.scss, _forms.scss (PRO --> _tabs.scss)
    |   |-- _carousels.scss --> <_buttons.scss>
    |   |-- _forms.scss --> none
    |   |-- _msc.scss --> none <_buttons.scss, _forms.scss, _cards.scss>
    |   |-- _footers.scss none <_buttons.scss> (PRO: )
    |   |-- _list-group.scss --> none
    |   |-- _tables.scss --> none (PRO: _material-select.scss, pro/_forms.scss, _checkbox.scss, pro/_buttons.scss, pro/_cards.scss, _pagination.scss, pro/_msc.scss)
    |   |-- _depreciated.scss
    |
    |-- pro/
    |   |
    |   |-- picker/
    |   |   |-- _default.scss --> none
    |   |   |-- _default-time.scss --> _default.scss, free/_forms.scss, free/_buttons.scss, pro/_buttons.scss, free/_cards.scss
    |   |   |-- _default-date.scss --> _default.scss, free/_forms.scss
    |   |
    |   |-- sections/
    |   |   |-- _templates.scss --> _sidenav.scss
    |   |   |-- _social.scss --> free/_cards.scss, free/ _forms.scss, free/_buttons.scss, pro/_buttons.scss,
    |   |   |-- _team.scss --> free/_buttons.scss, pro/_buttons.scss, free/_cards.scss, pro/_cards.scss
    |   |   |-- _testimonials.scss --> free/_carousels.scss, pro/_carousels.scss, free/_buttons.scss, pro/_buttons.scss
    |   |   |-- _magazine.scss --> _badges.scss
    |   |   |-- _pricing.scss --> free/_buttons.scss, pro/_buttons.scss
    |   |   |-- _contacts.scss --> free/_forms.scss, pro/_forms.scss, free/_buttons.scss, pro/_buttons.scss
    |   |
    |   |-- _variables.scss
    |   |-- _buttons.scss --> free/_buttons.scss, pro/_msc.scss, _checkbox.scss, _radio.scss
    |   |-- _social-buttons.scss --> free/_buttons.scss, pro/_buttons.scss
    |   |-- _tabs.scss --> _cards.scss
    |   |-- _cards.scss --> free/_cards.scss <_buttons.scss, _social-buttons.scss>
    |   |-- _dropdowns.scss --> free/_dropdowns.scss, free/_buttons.scss
    |   |-- _navbars.scss --> free/_navbars.scss  (PRO: )
    |   |-- _scrollspy.scss --> none
    |   |-- _lightbox.scss --> none
    |   |-- _chips.scss --> none
    |   |-- _msc.scss --> none
    |   |-- _forms.scss --> none
    |   |-- _radio.scss --> none
    |   |-- _checkbox.scss --> none
    |   |-- _material-select.scss --> none
    |   |-- _switch.scss --> none
    |   |-- _file-input.scss --> free/_forms.scss, free/_buttons.scss
    |   |-- _range.scss --> none
    |   |-- _input-group.scss --> free/_input-group.scss and the same what free input group, _checkbox.scss, _radio.scss
    |   |-- _autocomplete.scss --> free/_forms.scss
    |   |-- _accordion.scss --> pro/_animations.scss, free/_cards.scss
    |   |-- _parallax.scss --> none
    |   |-- _sidenav.scss --> free/_forms.scss, pro/_animations.scss, sections/_templates.scss
    |   |-- _ecommerce.scss --> free/_cards.scss, pro/_cards.scss, free/_buttons.scss, pro/_buttons.scss, pro/_msc.scss
    |   |-- _carousels.scss --> free/_carousels.scss, free/_cards.scss, free/_buttons.scss 
    |   |-- _steppers.scss --> free/_buttons.scss
    |   |-- _blog.scss --> none
    |   |-- _toasts.scss --> free/_buttons.scss
    |   |-- _animations.scss --> none
    |   |-- _charts.scss --> none
    |   |-- _progress.scss --> none
    |   |-- _scrollbar.scss --> none
    |   |-- _skins.scss --> none
    |   |-- _depreciated.scss
    |
    `-- _custom-skin.scss
    `-- _custom-styles.scss
    `-- _custom-variables.scss
    `-- mdb.scss

Map of dependencies of JavaScript modules in MDBootstrap:


    Legend:

    '-->' means 'required'

    All files require jQuery and bootstrap.js

    js/
    ├── dist/
    │   ├── buttons.js
    │   ├── cards.js
    │   ├── character-counter.js
    │   ├── chips.js
    │   ├── collapsible.js --> vendor/velocity.js
    │   ├── dropdown.js --> Popper.js, jquery.easing.js
    │   ├── file-input.js
    │   ├── forms-free.js
    │   ├── material-select.js --> dropdown.js
    │   ├── mdb-autocomplete.js
    │   ├── preloading.js
    │   ├── range-input.js --> vendor/velocity.js
    │   ├── scrolling-navbar.js
    │   ├── sidenav.js --> vendor/velocity.js, vendor/hammer.js, vendor/jquery.hammer.js
    │   └── smooth-scroll.js
    ├── _intro-mdb-pro.js
    ├── modules.js
    ├── src/
    │   ├── buttons.js
    │   ├── cards.js
    │   ├── character-counter.js
    │   ├── chips.js
    │   ├── collapsible.js --> vendor/velocity.js
    │   ├── dropdown.js --> Popper.js, jquery.easing.js
    │   ├── file-input.js
    │   ├── forms-free.js
    │   ├── material-select.js --> dropdown.js
    │   ├── mdb-autocomplete.js
    │   ├── preloading.js
    │   ├── range-input.js --> vendor/velocity.js
    │   ├── scrolling-navbar.js
    │   ├── sidenav.js --> vendor/velocity.js, vendor/hammer.js, vendor/jquery.hammer.js
    │   └── smooth-scroll.js
    └── vendor/
        ├── addons/
        │   ├── datatables.js
        │   └── datatables.min.js
        ├── chart.js
        ├── enhanced-modals.js
        ├── hammer.js
        ├── jarallax.js
        ├── jarallax-video.js --> vendor/jarallax.js
        ├── jquery.easing.js
        ├── jquery.easypiechart.js
        ├── jquery.hammer.js --> vendor/hammer.js
        ├── jquery.sticky.js
        ├── lightbox.js
        ├── picker-date.js --> vendor/picker.js
        ├── picker.js
        ├── picker-time.js --> vendor/picker.js
        ├── scrollbar.js
        ├── scrolling-navbar.js
        ├── toastr.js
        ├── velocity.js
        ├── waves.js
        └── wow.js

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