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How to Minify Your Website’s CSS, HTML & Javascript

How to Minify Your Website’s CSS, HTML & Javascript

When you minify your website’s CSS, HTML, and Javascript files, you can shave some valuable time off of your site’s page load speed. Now we aren’t talking about cutting your page load speed in half or anything, but when it comes to the speed of your website, any little bit helps. How fast your site loads is not only important for first time visitors, but it is also important for moving search engine ranking.

The term “minify” is programming lingo that describes the processes of removing unnecessary characters in the source code. These characters include whitespaces, line breaks, comments, and block delimiters which are useful for us humans but unnecessary for machines. We minify the files of a website containing CSS, HTML, and Javascript code so your web browser can read them faster.

Here is an example of what CSS minification looks like.

CSS Before Minification

/* Layout helpers

.ui-helper-hidden {
display: none;
.ui-helper-hidden-accessible {
border: 0;
clip: rect(0 0 0 0);
height: 1px;
margin: -1px;
overflow: hidden;
padding: 0;
position: absolute;
width: 1px;

CSS After Minification

.ui-helper-hidden{display:none}.ui-helper-hidden-accessible{border:0;clip:rect(0 0 0 0);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}

Obviously, this is just a small example using a snippet of CSS code, but you can imagine the the amount of space this would save when minifying thousands of lines of code. So, if you wanted to do this manually by hand, technically you could. But you would run a high risk of error and needlessly shave valuable time off or your life!

Take my advice and use the tools at your disposal.

Online Tools to Minify Your Files Manually

Thankfully, you don’t have to be a developer or know any of the programming languages in order to minify your site files. Minification has become standard practice in the world of web design so it shouldn’t surprise you to learn that there are a lot of wonderful (and free) tools out there to do the work for you.

Here is a list of some helpful tools to get your started. Since many of these can minify more than one code type, I’ve included the code type options in parenthesis.

  • Closure Compiler (JS only) – Closure Compiler is part of Closure Tools, a suite of tools from Google Developers. It allows you to minify your Javascript along with other helpful optimizations. You can pull in your Javascript using by entering the URL of the js file location and then choose how you want the code to be optimized and formatted. For example, you choose to optimize your code for Whitespace only if you want. Once you hit the compile button, it will minify (or compile) the code for you as well check your code for any errors.
  • cssminifier.com and javascript-minifier.com (CSS and JS) – These two minifiers by Andrew Chilton are simple to use. Simply paste in your code and then click the Minify button to output the minified code. You can even download the output code as a file for convenience.
  • csscompressor.net (CSS only) – This online CSS compressor is quick, easy, and free to use.
  • jscompress.com (JS only)- This JavaScript compression tool allows you to compress JavaScript code via Copy and Paste but you can also upload multiple JavaScript files at once. This is great for combining JavaScript files into one file for better page load speed.
  • refresh-sf.com (HTML, CSS and JS) – This compressor will minify JavaScript, CSS and HTML code types. It also includes all the compressor options for each code type if you need them.
  • htmlcompressor.com (HTML, CSS and JS) – This online compressor/minifier tool supports HTML, CSS and JS code types. It even supports different combination of code types like CSS + PHP and JavaScript + PHP. And you can even check the compressed code for errors as well.
  • minifycode.com (HTML, CSS and JS) – This site offers minifiers for JavaScript, CSS and HTML with a simple and clean UI that minifies your code with a single click of a button. It also includes a “beautifier” tool to uncompress minified code to make it easy to read (basically the opposite of minification).
  • Dan’s Tools – Dan’s Tools offers a CSS Minifier and a JavaScript Minifier. Both tools have a really clean UI that is and easy to use. They don’t offer any advanced options but it is perfect for common minification purposes.

If you are looking for some offline tools to minify your HTML CSS or JavaScript locally, here are a few options:

How to Minify Your Website’s CSS, HTML & Javascript

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How to Minify Your Minify your HTML, CSS and JavaScript Using an Online Tool

Many of these online tools have a similar process which involve the following steps:

Paste in your source code or upload the source code file.
Optimize the settings for a specific output (if options are available)
Click a button to minify or compress the code.
Copy the minified code output or download the minified code file.

For this example, I’m going to use the minify tools from minifycode.com.

First, locate the css file (commonly named style.css) in your site files and open the file using a page editor. Then copy the entire css code to your clipboard.

minfy html css javascript

Go to minifycode.com and click the CSS minifier tab. Then paste the CSS code into the input box and click the Minify CSS button.

minfy html css javascript

After the new minified code is generated, copy the code.

minfy html css javascript

Then go back to the css file of your website and replace the code with the new minified version.

That’s it!

Repeat the same process to minify your site’s JavaScript and Html file(s) as well.

How to Minify HTML, CSS and JavaScript in WordPress Using Plugins

The easiest way to minify your HTML, CSS and JavaScript in WordPress is to use a plugin. This allows you to optimize your WordPress site files for decreased page load times automatically with a few clicks of a button.

There are a lot of plugins out there that will do the job but I will briefly mention a few standouts.

Autoptimize (FREE)

minfy html css javascript
Autoptimize is probably the most popular minify plugins out there. It’s popular because it ease easy to use and full of powerful performance features. It can aggregate (combine scripts), minify, and cache your code. As a bonus, you have additional options for optimizing Google Fonts, images and more.

To use Autoptimize, you can download, install and activate the plugin from the WordPress Dashboard under Plugin > Add New.

minfy html css javascript

Once the plugin is activated, navigate to Settings > Autoptimize. Then under the main settings tab, check the code you wish to optimize (HTML, CSS, and/or JavaScript) and click Save Changes.

minfy html css javascript

You can also click the Show Advanced Settings button at the top of the page to further customize how you want your code to be optimized.

minfy html css javascript

That’s about it! Pretty simple and powerful.

Fast Velocity Minify (FREE)

minfy html css javascript

Fast Velocity Minify is another popular, free and powerful WordPress plugin that does more than just minify. It minifies and combines your CSS and Javascript to reduce HTTP requests to your server, thus living up to its name to give you fast velocity page load times. There are addition optimization options available but the default settings work beautifully for most sites.

To use the plugin, first install and activate if from your WordPress Dashboard by navigating to Plugins > Add New. Then search for “fast velocity minify” and once it popups up in the search results, click to install and activate it.

minfy html css javascript

Once the plugin is activated, your files will automatically become minified and optimized for best performance. That was easy!

Jump over to the plugin settings page (Settings > Fast Velocity Minify) to see all the options available. Under the Status tab, you can see a helpful list of your JavaScript and CSS files that have been processed.

minfy html css javascript

Under the Settings tab, you can customize the way your files are being optimized. Since minification of HTML, CSS and JavaScript are already active, you can use these settings to adjust the default options or disable minification for certain code types. There is even options for optimizing Google Fonts and Font Awesome.

minfy html css javascript

That’s it!

W3 Total Cache (FREE)

minfy html css javascript
W3 Total Cache is a great caching plugin that includes the option to minify your HTML, JS, and CSS.

minfy html css javascript

WP Fastest Cache (FREE)

minfy html css javascript
WP Fastest Cache – These FREE WordPress caching plugin is extremely popular with high reviews. The plugin performs various performance optimizations including combining and minifying your HTML CSS and JavaScript for better performance.

Once the plugin has been installed, simply click the WP Fastest Cache tab in the WordPress Dashboard sidebar (the one with the amazing cheetah icon). Under the settings tab, you will find options to combine and minify HTML and CSS files. Although minifying JavaScript is only available in the pro version.

minfy html css javascript

Final Thoughts

If you want faster page load times and better performance scores, you will want to minify you HTML, CSS and Javascript files. With all the online tools available, you can easily minify your code for any website. And for you WordPress users, there are some powerful plugins available to minify those files automatically with a few clicks. The plugins above are only a few of the great plugins out there that handle minification among other performance optimizations. In fact you may already have a performance type plugin that has minification already available. For example, many of the caching plugins include the minification option. I hope this post helps you decide which is the best option for you.

I look forward to hearing from you in the comments below.


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