HTML CSS JavaScript Minifier Online

🔗 Related Tools

Free Online HTML, CSS & JS Minifier

Minification removes characters that browsers do not need, such as comments, extra spaces and line breaks. The result is a smaller file that downloads faster. Smaller files can help page speed, which is one of many factors in user experience and SEO. The amount you save depends on your code: heavily commented and indented code shrinks the most. All minification runs in your browser, so your code is never uploaded.

What Each Minifier Does

• HTML: removes comments, line breaks and extra spaces between tags.
• CSS: removes comments, spaces and newlines, and the last semicolon in each rule. It handles @media, @keyframes, @font-face and @import.
• JavaScript: removes comments and extra whitespace. It does not rename variables, so your functions and events keep working. For advanced minification with variable renaming, use a tool like Terser.

Before and After

<!-- Header -->
<div class="box">
    <h1>Hello</h1>
</div>

<div class="box"><h1>Hello</h1></div>

 /* Button */
.btn {
    color: #ffffff;
    margin: 0px;
}

.btn{color:#ffffff;margin:0px}

// add two numbers
function add(a, b) {
    return a + b;
}

function add(a,b){return a+b;}

Why Use This Minifier?

• Free, with no signup.
• Runs in your browser. Your code never leaves your device.
• Shows how much size you saved, as a percentage.
• Copy the result with one click or download it as a file.
• Works on mobile, tablet and desktop.

How to Use the Minifier

1. Choose the HTML, CSS or JS minifier.
2. Paste your code into the input box.
3. Click Minify Now.
4. Check the saved percentage, then click Copy Minified or Download File.
5. Test the minified code on your site before replacing the original.

Frequently Asked Questions

What is code minification?

Minification is the process of removing unnecessary characters, such as whitespace, comments and newlines, from code without changing what it does. The file becomes smaller and loads faster.

Will minifying break my code?

Usually not, but no minifier is 100% risk-free. Always keep a backup of your original code and test the minified version before using it on your live site.

Is my code uploaded to a server?

No. Minification happens locally in your browser using JavaScript. Your HTML, CSS and JS never leave your device.

What is the difference between minifying and compressing?

Minification removes unnecessary characters from the code itself. Compression (GZIP or Brotli) is applied by the server when it sends the file. Best practice is to minify your files and also enable server compression.

Does this tool rename JavaScript variables?

No. It removes comments and whitespace only. For advanced minification that shortens variable names, use a tool like Terser.

How much size will I save?

It depends on your code. Files with many comments and indentation shrink the most. The tool shows the exact percentage saved after each run.