Optimize your website performance by reducing your file sizes by 30 to 70% on average. This advanced minification, unminification and beautification tool processes JavaScript, CSS and JSON in real-time, without compromising your data security. Perfect for developers, web agencies and businesses looking to improve their SEO and user experience.

Supported languages

Select a language to compress, decompress or beautify your code.

How does it work?

Our minification tool is designed to be simple, fast and secure.

1

Paste your code

Copy and paste your code into the left editor. Our automatic detection recognizes the language.

2

Configure options

Customize minification according to your needs: compatibility, compression, optimizations.

3

Get the result

Your minified code appears instantly. Download or copy the result.

Minification examples

Discover how minification transforms your code to optimize performance.

JavaScript

Original code:

function calculateTotal(items) {
let total = 0;

for (let i = 0; i < items.length; i++) {
total += items[i].price * items[i].quantity;
}

return total;
}

function init() {
calculateTotal();
}

Minified code:

function calculateTotal(t){let l=0;for(let n=0;n<t.length;n++)l+=t[n].price*t[n].quantity;return l}function init(){calculateTotal()}

CSS

Original code:

.header {
background-color: #ffffff;
padding: 20px;
margin-bottom: 10px;
border-radius: 5px;
color: #333333;
}

.header .title {
font-size: 24px;
font-weight: bold;
color: #333333;
}

Minified code:

.header{background-color:#fff;padding:20px;margin-bottom:10px;border-radius:5px;color:#333}.header .title{font-size:24px;font-weight:700;color:#333}

What is JavaScript and CSS code minification?

JavaScript and CSS code minification is the process of removing unnecessary characters from source code without changing its functionality. This includes whitespace, comments, and shortening variable names to optimize web performance.

In modern web development, every millisecond counts. Minification transforms your readable code into an optimized version that loads faster, consumes less bandwidth, and improves user experience. It’s an essential practice for high-traffic sites, web applications, and e-commerce projects where performance directly impacts conversions. Discover our approach and algorithms →

File size reduction

Minification can reduce JavaScript and CSS file sizes by 30-70%, significantly improving page load times. This optimization is particularly crucial for mobile sites and slow connections, where every kilobyte saved matters.

Bandwidth optimization

Smaller files mean less data transfer, reducing bandwidth costs and improving user experience on slower connections. For a site with 10,000 daily visitors, this can represent substantial hosting cost savings.

Code obfuscation

Minified code is harder to read and reverse-engineer, providing a basic level of code protection. While not absolute security, it discourages attempts at copying or malicious modification.

SEO and Performance Optimization

Code minification directly improves your search engine ranking and your site’s user experience.

SEO Impact

• •Improves Google’s Core Web Vitals
• •Reduces page loading times
• •Increases conversion rates
• •Improves mobile experience

Technical optimizations

• •Removes unnecessary spaces
• •Shortens variable names
• •Optimizes expressions
• •GZIP compression compatible

Latest blog articles

Discover our guides and tutorials to optimize your web performance.

Frequently Asked Questions

Find answers to the most common questions about code minification.

Does minification break my code?

No, minification only changes the code presentation (spaces, comments, variable names) without altering its functionality. Your code works exactly the same way.

Can I unminify minified code?

Yes, this tool can unminify JavaScript and CSS minified code, although the result may not always be identical to the original code (comments and variable names are lost).

Is my data secure?

Absolutely. All processing happens client-side in your browser. No data is sent to servers, ensuring complete privacy.

What file types can I minify?

This tool supports JavaScript, CSS and JSON for minification, as well as PHP serialization. Each file type has its own optimization options for maximum results.

Does minification really improve performance?

Yes, minification can reduce file sizes by 30 to 70%, resulting in faster loading times and better user experience.

Is the tool really free?

Yes, Fast Minify is 100% free and requires no registration. You can use it as much as you want without any limitations.

Still have questions? Contact us →