htmlnano

Modular HTML minifier, built on top of the PostHTML. Inspired by cssnano.

Documentation

https://htmlnano.netlify.app

Usage

npm install htmlnano

const htmlnano = require('htmlnano');
const options = {
    removeEmptyAttributes: false, // Disable the module "removeEmptyAttributes"
    collapseWhitespace: 'conservative' // Pass options to the module "collapseWhitespace"
};
// posthtml, posthtml-render, and posthtml-parse options
const postHtmlOptions = {
    sync: true, // https://github.com/posthtml/posthtml#usage
    lowerCaseTags: true, // https://github.com/posthtml/posthtml-parser#options
    quoteAllAttributes: false, // https://github.com/posthtml/posthtml-render#options
};

htmlnano
    // "preset" arg might be skipped (see "Presets" section below for more info)
    // "postHtmlOptions" arg might be skipped
    .process(html, options, preset, postHtmlOptions)
    .then(function (result) {
        // result.html is minified
    })
    .catch(function (err) {
        console.error(err);
    });

Also, you can use it as CLI tool:

node_modules/.bin/htmlnano --help

More usage examples (PostHTML, CLI, Webpack): https://htmlnano.netlify.app/usage

Benchmarks

Website	Source (KB)	html-minifier-terser	html-minifier-next	htmlnano	minify	minify-html
alistapart.com	63	7.6%	11.6%	34.6%	11.1%	8.6%
developer.mozilla.org	109	38.0%	41.7%	52.8%	40.1%	39.9%
css-tricks.com	11	8.2%	34.1%	37.2%	18.8%	8.5%
en.wikipedia.org	224	4.5%	7.4%	7.2%	60.6%	2.9%
github.com	546	3.0%	9.7%	16.7%	7.3%	5.7%
edri.org	80	7.7%	12.3%	30.6%	12.3%	8.2%
leanpub.com	251	1.3%	6.9%	6.3%	6.0%	1.7%
stackoverflow.blog	139	3.9%	5.7%	7.0%	4.6%	4.7%
html.spec.whatwg.org	149	-3.9%	0.7%	-2.6%	0.3%	0.2%
eff.org	54	8.8%	14.7%	10.9%	13.4%	9.7%
apple.com	229	8.9%	12.5%	11.5%	10.4%	9.5%
w3.org	50	19.0%	24.6%	23.4%	24.4%	20.3%
mastodon.social	37	3.4%	6.8%	14.6%	5.9%	3.6%
bbc.co.uk	694	0.8%	6.3%	5.9%	4.7%	1.2%
un.org	151	14.2%	22.5%	41.2%	20.0%	15.0%
lafrenchtech.gouv.fr	152	13.2%	17.9%	64.1%	17.0%	13.8%
sitepoint.com	497	0.8%	7.4%	12.9%	6.1%	0.9%
faz.net	1572	3.4%	8.0%	15.8%	4.8%	3.6%
weather.com	2395	0.3%	11.4%	18.1%	11.0%	0.6%
tc39.es	7254	8.5%	11.3%	9.3%	9.5%	9.1%
home.cern	151	37.1%	46.4%	40.2%	38.9%	39.5%
Avg. minify rate		9.0%	15.2%	21.8%	15.6%	9.9%

Latest benchmarks: https://github.com/maltsev/html-minifiers-benchmark (updated daily).