Magento Platform
Open Source (CE)
1.5, 1.6, 1.6.1,, 1.7, 1.8, 1.8.1, 1.9, 1.9.1, 1.9.2, 1.9.3, 1.9.4

Tech Specifications

Current Version:
Stable Build
10 October, 2019
Extensions, Site Optimization, Performance
License Type:
Open Software License 3.0 (OSL-3.0)


Minify HTML CSS JS including inline CSS/JS and speed up your site. Works with default Magento CSS/JS merger.

Other Extensions by Apptrian


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Minification is the process of removing all unnecessary characters  from source code without changing its functionality - e.g. code comments  and formatting, removing unused code, using shorter variable and  function names, and so on. After minification code is smaller in size  that means fewer bytes will be transmitted from your server to your  customer's web browsers which makes your site pages load faster. Beside  small speed increase search engines (especially Google) will give you a  plus in the SEO department (Search Engine Optimization). So you should  definitely Minify your code.

Apptrian Minify HTML CSS JS is a very small and efficient extension.  It will minify HTML including inline CSS and JS code. Minification of  CSS and JS files is compatible with default Magento CSS and JS file  merger. There are no complex setups nor query strings on minified CSS  and JS files. The extension is very easy to install and use. Compatible  with FPC and Varnish cache extensions. If there is a serious error in  some page code that page will not be minified. The extension will log  the error and URL of the page where this error occurs so developers can  track it down and fix the code.



  • An easy way to enable or disable HTML Minification.
  • Option to set Maximum HTML Minification.
  • Cache Compatibility Mode option for HTML minification.
  • Option to remove important comments or not.
  • An easy way to Minify CSS and JavaScript files with a button click.


This extension is FREE, however, support is NOT

Please understand that we get more than a few emails almost every day  asking for support. In most cases, problems are lack of basic Magento  knowledge and not reading Installation Instructions. Due to our other  projects, we do not have time to answer all of them. Because of this, we  cannot provide free support for our free extensions. However, we offer  very affordable support options for this extension on our site.



Q: After enabling "Minify HTML" I get "JSMin: Unterminated String at byte ..." on the frontend?
A: This happens when you have errors in your inline JavaScript. Examples would be:
ga('set','something', 'Women's'); un-escaped single quote
or if you have JSON object that has un-escaped new lines just before closing double quotes.
These are all errors and our extension is only exposing these errors. We wrote in our extension, you must have the error-free code if you want minification to work.

Q: Why after clicking the "Minify" button and success message, when I look at the files from my browser they are not minified?
A: You are probably using Expire Headers on CSS and JS files (Leverage  browser caching). Your browser is showing you cached (old) version of  the files. To quickly check if your files are minified use Google Page  Insights or similar testing utility.

Q: Why after enabling minification my pages are all mangled up / have missing parts?
A: You probably have errors in your HTML/CSS/JS code. One stray tag is  enough to cause this behavior. Before you enable minification you must  have the error-free code. Turn minification off, use the W3C validator to find errors and fix them.

Q: Why are not all CSS/JS files merged and minified?
A: First of all external(off-site) CSS/JS files will not be merged and minified. For example:

Minifying…ork?v=0.0.2000-RC8.41700-1420&lang=en_US could save 2KiB (5% reduction) after compression.

This happens if you use a Linkedin button, this file is on the Linkedin server not on your server it is their responsibility to minify it, not yours, your Magento installation nor our Minify extension. Second, all CSS and JS must be properly included in Magento via .xml file for example page.xml of your theme. Some extensions might hardcode link and script tags into .phtml templates, these files will not be merged by Magento default file merger (Magento does not know about them because they are not properly included) and subsequently, our Minify extension will not minify them.

Q: Why Google PageSpeed Insights reports that CSS/JS files are not fully minified? (1)
A: Sometimes it is because gzip compression is turned off on your server. Use your .htaccess file to enable it.

<IfModule mod_deflate.c>
# Compress text, html, javascript, css, xml:
AddOutputFilterByType DEFLATE text/plain text/html text/xml  text/css application/xml application/xhtml+xml application/rss+xml  application/javascript application/x-javascript

Q: Why Google PageSpeed Insights reports that CSS/JS files are not fully minified? (2)
A: Sometimes Google PageSpeed Insights will report that CSS/JS files are not fully minified. For example:
Minifying…a/js/6a3cfa142fd20a7dc62423f1c15e4ad9.js could save 648B (1% reduction) after compression.
This is normal. Some of the CSS/JS files/libraries published by Google  also have this or similar complaints from Google PageSpeed Insights.
Minifying…/cb=gapi.loaded_0 could save 684B (2% reduction) after compression.
If Google itself cannot satisfy its own Google PageSpeed Insights testing tool, then what chance anyone else has. :-D
 Rest assured your files are properly minified, by the tools recommended  by Google, so just ignore these types of complaints from Google  PageSpeed Insights.

Q: When I click the "Minify" button in extension configuration I get "Connection reset" error?
A: If you are on Windows you must set your Apache properly. (It is a common  problem when working with long regular expressions in PHP). You need to  increase the Apache's stack size. The best way to alter the Apache's  stack size is using the ThreadStackSize directive in the Apache's configuration file. Here is how to do it.
In your Apache httpd.conf file uncomment #Include conf/extra/httpd-mpm.conf like this.

# Server-pool management (MPM specific)
Include conf/extra/httpd-mpm.conf

Then in conf/extra/httpd-mpm.conf file set ThreadStackSize to 8388608. Something like this:

<IfModule mpm_winnt_module>
ThreadStackSize 8388608

It sets Apache's stack size to 8 MB, so it is the same as a default value on Linux.

Q: After clicking the "Minify" button I get a white screen in the web browser?
A: Delete all files in following directories: media/css,  media/css_secure, and media/js then visit several pages of your site on  the frontend and wait for them to fully load. (Visit homepage, one CMS  page, one category page, one product page, cart page, and checkout page.  This is done so Magento default merger can merge CSS and JS files, and  some extensions add CSS and/or JS files only on specific pages not  globally.) After you do this click the "Minify" button again and wait  for it to finish.

Q: After clicking the "Minify" button my site is all mangled up or not working?
A: You probably have errors in your CSS and/or JS files. Delete all  files in following directories: media/css, media/css_secure, and  media/js then visit several pages of your site on the frontend and wait  for them to fully load. (Visit homepage, one CMS page, one category  page, one product page, cart page, and checkout page. This is done so  Magento default merger can merge CSS and JS files, and some extensions  add CSS and/or JS files only on specific pages not globally.) After you  do this use CSS and JS validators to check your code and fix errors  before you try to minify again. Just before you want to try minification  again repeat the process of deleting files in media/css,  media/css_secure, and media/js directories and visiting several pages on  your frontend.


A Word From the Author

Thank you very much for your interest in Minify HTML CSS JS  extension. You can rest assured that by choosing this extension you are  getting high-quality product despite the fact it is free. The same  professional approach, dedication, and care are invested in this product  as if it is paid one. If you find this product useful and want to say  "thanks" you can do that by rating it and writing a short review about  it on Magento Marketplace. Also, you can like, share and follow us on Facebook, Google+, Pinterest, and Twitter.

If you have any questions about extension or Magento in general feel free to contact us.

Release Notes

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  • Compatible with Open Source (CE) : 1.5 1.6 1.6.1 1.7 1.8 1.8.1 1.9 1.9.1 1.9.2 1.9.3 1.9.4
  • Stability: Stable Build
  • Description:

    * Compatibility with PHP v7.3


  • Compatible with Open Source (CE) : 1.5 1.6 1.6.1 1.7 1.8 1.8.1 1.9 1.9.1 1.9.2 1.9.3 1.9.4
  • Stability: Stable Build
  • Description:

    * Compatibility with PHP v7.2
    * Fixed options text in Magento admin config


  • Compatible with Open Source (CE) : 1.5 1.6 1.6.1 1.7 1.8 1.8.1 1.9 1.9.1 1.9.2
  • Stability: Stable Build
  • Description:

    * Fixed few small issues with admin blocks
    * Code standards improvements


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The best place to start if you need help with a specific extension is to contact the developer. All Magento developers have both a contact email and a support email listed.

Q & A

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