casedy / html-minifier

Javascript-based HTML compressor/minifier (with Node.js support)

HTMLMinifier is a highly configurable, well-tested, Javascript-based HTML minifier, with lint-like capabilities.

See corresponding blog post for all the gory details of how it works, description of each option, testing results and conclusions.

Test suite is available online.

Also see corresponding Ruby wrapper, and for Node.js, Grunt plugin & Gulp module.

How does HTMLMinifier compare to another solution — HTML Minifier from Will Peavy (1st result in google search for "html minifier")?

Site	Original size (KB)	HTMLMinifier (KB)	Will Peavy (KB)
Wikipedia	401.4	385.5	396.3
Stackoverflow	200.4	165.3	168.3
MSN	160	141	145
Amazon	245.9	237.1	225
ES6 table	117.9	82	92
HTMLMinifier page	48.8	41.3	43.3
Eloquent Javascript	890	860	872

Options Quick Reference

Option	Description	Default
removeComments	Strip HTML comments	false
removeCommentsFromCDATA	Strip HTML comments from scripts and styles	false
removeCDATASectionsFromCDATA	Remove CDATA sections from script and style elements	false
collapseWhitespace	Collapse white space that contributes to text nodes in a document tree.	false
conservativeCollapse	Always collapse to 1 space (never remove it entirely)	false
collapseBooleanAttributes	Omit attribute values from boolean attributes	false
removeAttributeQuotes	Remove quotes around attributes when possible.	false
removeRedundantAttributes	Remove attributes when value matches default.	false
useShortDoctype	Replaces the doctype with the short (HTML5) doctype	false
removeEmptyAttributes	Remove all attributes with whitespace-only values	false
removeOptionalTags	Remove unrequired tags	false
removeEmptyElements	Remove all elements with empty contents	false
lint	Toggle linting	false
keepClosingSlash	Keep the trailing slash on singleton elements	false
caseSensitive	Treat attributes in case sensitive manner (useful for SVG; e.g. viewBox)	false
minifyJS	Minify Javascript in script elements and on* attributes (uses UglifyJS)	false (could be true, false, Object (options))
minifyCSS	Minify CSS in style elements and style attributes (uses clean-css)	false (could be true, false, Object (options))
ignoreCustomComments	Array of regex'es that allow to ignore certain comments, when matched	[ ]
processScripts	Array of strings corresponding to types of script elements to process through minifier (e.g. "text/ng-template", "text/x-handlebars-template", etc.)	[ ]

Chunks of markup can be ignored by wrapping them with <!-- htmlmin:ignore -->.

Installation Instructions

From NPM for use as a command line app:

npm install html-minifier -g

From NPM for programmatic use:

npm install html-minifier

From Git:

git clone git://github.com/kangax/html-minifier.git
cd html-minifier
npm link .

Usage

For command line usage please see html-minifier --help

Node.js

require('html-minifier')