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Async single-file cross-platform no-dependencies Minifier for the Web. GPL License LGPL License Python Version Travis report

screenshot --help

usage: [-h] [--version] [--wrap] [--prefix PREFIX]
                             [--timestamp] [--quiet] [--hash] [--zipy]
                             [--sort] [--comments] [--overwrite]
                             [--after AFTER] [--before BEFORE] [--watch]
                             [--multiple] [--beep]

CSS-HTML-JS-Minify. StandAlone Async cross-platform Unicode-ready Python3-ready Minifier for the Web.

positional arguments:
  fullpath         Full path to local file or folder.

optional arguments:
  -h, --help       show this help message and exit
  --version        show programs version number and exit
  --wrap           Wrap output to ~80 chars per line, CSS only.
  --prefix PREFIX  Prefix string to prepend on output filenames.
  --timestamp      Add a Time Stamp on all CSS/JS output files.
  --quiet          Quiet, Silent, force disable all logging.
  --hash           Add SHA1 HEX-Digest 11chars Hash to Filenames.
  --zipy           GZIP Minified files as '*.gz', CSS/JS only.
  --sort           Alphabetically Sort CSS Properties, CSS only.
  --comments       Keep comments, CSS/HTML only (Not Recommended)
  --overwrite      Force overwrite all in-place (Not Recommended)
  --after AFTER    Command to execute after run (Experimental).
  --before BEFORE  Command to execute before run (Experimental).
  --watch          Re-Compress if file changes (Experimental).
  --multiple       Allow Multiple instances (Not Recommended).

CSS-HTML-JS-Minify: Takes a file or folder full path string and process all
CSS/HTML/JS found. If argument is not file/folder will fail. Check Updates
works on Python3. Std-In to Std-Out is deprecated since it may fail with
unicode characters. SHA1 HEX-Digest 11 Chars Hash on Filenames is used for
Server Cache. CSS Properties are Alpha-Sorted, to help spot cloned ones,
Selectors not. Watch works for whole folders, with minimum of ~60 Secs between
  • Takes a full path to anything, a file or a folder, then parse, optimize and compress for Production.
  • If full path is a folder with multiple files it will use Async Multiprocessing.
  • Pretty-Printed colored Logging to Standard Output and Log File on OS Temporary Folder.
  • Set its own Process name and show up on Process lists.
  • Can check for updates for itself.
  • Full Unicode/UTF-8 support.
  • Smooth CPU usage, Single Instance Checking.
  • Can Obfuscate, GZIP and Hash files, also Watch for changes on files.
  • Can execute arbitrary commands after and before running.
  • *.css files are saved as *.min.css, *.js are saved as *.min.js, *.htm are saved as *.html




Apple Mac Os X: (Provided by Loggerhead) screenshot


MS Windows:


Command-line usage file.htm file.css file.js /project/static/

Python code usage

from css_html_js_minify import process_single_html_file, process_single_js_file, process_single_css_file, html_minify, js_minify, css_minify

process_single_html_file('test.htm', overwrite=False)
# 'test.html'
process_single_js_file('test.js', overwrite=False)
# 'test.min.js'
process_single_css_file('test.css', overwrite=False)
# 'test.min.css'

html_minify('  <p>yolo<a  href="/" >o </a >     <!-- hello --></p>')
# '<p>yolo<a href="/" >o </a > </p>'
js_minify('var i = 1; i += 2 ;\n alert( "hello  "  ); //hi')
# 'var i=1;i+=2;alert("hello  ");'
css_minify('body {width: 50px;}\np {margin-top: 1em;/* hi */  }', comments=False)
# '@charset utf-8;body{width:50px}p{margin-top:1em}'

The optional arguments that these functions take are almost the same as the command-line flags. Check the list above (just use add_hash instead of hash). Additionally, you can force a specific path for the output files using output_path.


pip install css-html-js-minify

Uninstall pip uninstall css-html-js-minify


  • Why another Compressor ?, there are lots of compressors for web files out there!; Or maybe not ?.
  • Many of them only work inside Django/Flask, or frameworks of PHP/Java/Ruby, or can not process whole folders.
  • This project is the big brother of another project that does the inverse, a Beautifier for the Web.


To keep things simple KISS, the human readable indented commented hackable HTML is kept as *.htm and the compressed production-ready as *.html. This is inspired from JavaScript/CSS *.min.js and *.min.css. We did not "invent" this file extension.

To migrate from typical file extension HTML to HTM, which is the exactly same, you can run this:

find . -name "*.html" -exec rename "s/.html/.htm/" "{}" \;

This will make a copy of all *.html renaming them as *.htm recursively from the current folder. Nothing deleted.


Coding Style Guide

  • Lint, PEP-8, PEP-257, iSort must Pass Ok. pip install pep8 isort
  • If there are any kind of tests, they must pass. No tests is also acceptable, but having tests is better.

JavaScript support

  • ES6 and ES7 and future standards may not be fully supported since they change quickly, mainly driven by Node.JS releases.
  • Future JavaScript support is orphan, if you want to make ES6, ES7 work feel free to send pull request, we will merge it.


  • Please Star this Repo on Github !, it helps to show up faster on searchs.
  • Help and more Help and Interactive Quick Git Tutorial.


  • GNU GPL and GNU LGPL and MIT.

This work is free software: You can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This work is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; Without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this work.


Input CSS:

 * preserve commment

/* delete comment */
.class, #NotHex, input[type="text"], a:hover  {
    font-family : Helvetica Neue, Arial, Helvetica, 'Liberation Sans', sans-serif;
    border: none;
    margin: 0 0 0 0;
    border-color:    fuchsia;
    color:           mediumspringgreen;
    background-position:0 0;;
    transform-origin:0 0;
    margin: 0px !important;
    font-weight :bold;
    color: rgb( 255, 255, 255 );
    padding : 0.9px;
    position : absolute;
    z-index : 100000;
    color: #000000;
    background-color: #FFFFFF;
    background-image: url("data:image/jpeg;base64,R0lGODlhAQABAIAAAAUEBAAAACwAAAAAAQABAAACAkQBADs=");

Uglify (NodeJS): (474 Bytes, 0.189 Secs)

/* * preserve commment */ .class,#NotHex,input[type="text"],a:hover {font-family:Helvetica Neue,Arial,Helvetica,'Liberation Sans',sans-serif;border:0;margin:0;border-color:fuchsia;color:mediumspringgreen;background-position:0 0;transform-origin:0 0;margin:0 !important;font-weight:bold;color:#fff;padding:.9px;position:absolute;z-index:100000;color:#000;background-color:#fff;background-image:url("data:image/jpeg;base64,R0lGODlhAQABAIAAAAUEBAAAACwAAAAAAQABAAACAkQBADs=")};

css-html-js-minify (Python3): (469 Bytes, 0.010 Secs)

/*!* preserve commment */ .class,#NotHex,input[type=text],a:hover{font-family:Helvetica Neue,Arial,Helvetica,'Liberation Sans',sans-serif;border:0;margin:0;border-color:#f0f;color:#00fa9a;background-position:0 0;transform-origin:0 0;margin:0 !important;font-weight:700;color:#fff;padding:.9px;position:absolute;z-index:100000;color:#000;background-color:#FFF;background-image:url(data:image/jpg;base64,R0lGODlhAQABAIAAAAUEBAAAACwAAAAAAQABAAACAkQBADs=)}

Ethics and Humanism Policy

  • May this FLOSS be always Pristine and Clean, No AdWare, No Spamm, No BundleWare, No Infomercial, No MalWare.
  • This project is LGBTQQIAAP friendly.


StandAlone Async cross-platform Minifier for the Web.



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