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A plugin for PostCSS that generates viewport units (vw, vh, vmin, vmax) from pixel units.

Sponsored by Evrone


If your project involves a fixed width, this script will help to convert pixels into viewport units.


.class {
  margin: -10px .5vh;
  padding: 5vmin 9.5px 1px;
  border: 3px solid black;
  border-bottom-width: 1px;
  font-size: 14px;
  line-height: 20px;

.class2 {
  border: 1px solid black;
  margin-bottom: 1px;
  font-size: 20px;
  line-height: 30px;

@media (min-width: 750px) {
  .class3 {
    font-size: 16px;
    line-height: 22px;


.class {
  margin: -3.125vw .5vh;
  padding: 5vmin 2.96875vw 1px;
  border: 0.9375vw solid black;
  border-bottom-width: 1px;
  font-size: 4.375vw;
  line-height: 6.25vw;

.class2 {
  border: 1px solid black;
  margin-bottom: 1px;
  font-size: 6.25vw;
  line-height: 9.375vw;

@media (min-width: 750px) {
  .class3 {
    font-size: 16px;
    line-height: 22px;

Getting Started


Add via npm

$ npm install postcss-px-to-viewport --save-dev

or yarn

$ yarn add -D postcss-px-to-viewport


Default Options:

  unitToConvert: 'px',
  viewportWidth: 320,
  unitPrecision: 5,
  propList: ['*'],
  viewportUnit: 'vw',
  fontViewportUnit: 'vw',
  selectorBlackList: [],
  minPixelValue: 1,
  mediaQuery: false,
  replace: true,
  exclude: [],
  landscape: false,
  landscapeUnit: 'vw',
  landscapeWidth: 568
  • unitToConvert (String) unit to convert, by default, it is px.
  • viewportWidth (Number) The width of the viewport.
  • unitPrecision (Number) The decimal numbers to allow the vw units to grow to.
  • propList (Array) The properties that can change from px to vw.
    • Values need to be exact matches.
    • Use wildcard * to enable all properties. Example: ['*']
    • Use * at the start or end of a word. (['position'] will match background-position-y)
    • Use ! to not match a property. Example: ['*', '!letter-spacing']
    • Combine the "not" prefix with the other prefixes. Example: ['', '!font']
  • viewportUnit (String) Expected units.
  • fontViewportUnit (String) Expected units for font.
  • selectorBlackList (Array) The selectors to ignore and leave as px.
    • If value is string, it checks to see if selector contains the string.
      • ['body'] will match .body-class
    • If value is regexp, it checks to see if the selector matches the regexp.
      • [/^body$/] will match body but not .body
  • minPixelValue (Number) Set the minimum pixel value to replace.
  • mediaQuery (Boolean) Allow px to be converted in media queries.
  • replace (Boolean) replaces rules containing vw instead of adding fallbacks.
  • exclude (Array or Regexp) Ignore some files like 'node_modules'
    • If value is regexp, will ignore the matches files.
    • If value is array, the elements of the array are regexp.
  • landscape (Boolean) Adds @media (orientation: landscape) with values converted via landscapeWidth.
  • landscapeUnit (String) Expected unit for landscape option
  • landscapeWidth (Number) Viewport width for landscape orientation.

Use with gulp-postcss

add to your gulpfile.js:

var gulp = require('gulp');
var postcss = require('gulp-postcss');
var pxtoviewport = require('postcss-px-to-viewport');

gulp.task('css', function () {

    var processors = [
            viewportWidth: 320,
            viewportUnit: 'vmin'

    return gulp.src(['build/css/**/*.css'])

Use with PostCss configuration file

add to your postcss.config.js

module.exports = {
  plugins: {
    'postcss-px-to-viewport': {
      // options

Running the tests

In order to run tests, you need to install jasmine-node globally:

$ npm install jasmine-node -g

Then run the tests via npm script:

$ npm run test


Please read Code of Conduct and Contributing Guidelines for submitting pull requests to us.


We use SemVer for versioning. For the versions available, see the tags on this repository.


The changelog is here.


See also the list of contributors who participated in this project.


This project is licensed under the MIT License.


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npm i @766aya/postcss-px-to-viewport

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