Free JS & CSS Unminify Tool

Make minified, compressed JavaScript and CSS code readable again. Works directly in your browser - no server upload needed. 100% free.

Unminify Your Code

📁 Drag & drop files here or click to upload

Supports .js, .css, .html, .xml, .json files

Free Online JS & CSS Unminify Tool

Our free JavaScript and CSS unminify tool is designed specifically for web developers and designers who need to read and analyze minified code. Whether you're debugging a website, learning from others' code, or need to modify minified scripts, this tool makes the process effortless.

What is Code Minification?

Minification is the process of removing all unnecessary characters from source code without changing its functionality. This includes:

  • White spaces and line breaks
  • Comments and documentation
  • Block delimiters and unnecessary semicolons
  • Shortening variable names (in advanced minification)

Why Unminify Code?

While minified code is perfect for production (smaller file size = faster loading), it's impossible to read and work with. Our unminifier helps you:

  • Debug production code - Read error messages in context
  • Learn from others - Study how popular websites structure their code
  • Modify existing scripts - Make changes to minified libraries
  • Educational purposes - Understand minification techniques

Key Features of Our Unminify Tool

Our tool stands out with these features:

  • Browser-based processing - Your code never leaves your computer
  • Multiple format support - JS, CSS, HTML, XML, and JSON
  • Adjustable formatting - Customize tab sizes for readability
  • File upload support - Drag and drop or click to upload
  • Zero cost - Completely free with no hidden charges
  • No registration required - Start using immediately

How It Works

The unminification process analyzes your compressed code and:

  1. Detects code structure and syntax patterns
  2. Adds appropriate line breaks and indentation
  3. Formats braces, brackets, and parentheses for clarity
  4. Preserves the original functionality while improving readability

Note: Our tool cannot restore original variable names or comments that were removed during minification. It focuses on making the existing code structure readable again.

Frequently Asked Questions

What does a JS & CSS unminifier do? +
Our free JS & CSS Unminify tool lets you uncompress, reformat, and reindent ugly minified JS & CSS code to make it readable. Copy and paste your code directly into the box above, or upload multiple JS or CSS files to see the unminifier in action. This tool is especially useful if you want to analyse a site's JS or CSS code, but you only have access to the minified version.
Why would you unminify JS or CSS code? +
Minified JS & CSS code is streamlined to the point of being unreadable. It's easier for servers and search engines to load minified code, but almost impossible for people to read it. If you want to be able to easily read this code, you have to recover lines, spaces, and other elements that were deleted through minifying. Our free JS & CSS Unminify tool can do this automatically, within seconds.
How do you use this tool? +
Using our free tool is super simple. Just copy paste your minified code into the box above, or drag-and-drop entire files in the outlined area. Select your code language (JavaScript, CSS, HTML, XML, or JSON), then click the "Unminify" button. Within seconds, you'll have access to the unminified version of your code.
Can I still optimize my code after unminifying it? +
Absolutely. Once you're done analysing or editing the code, use our free minifier tool to remove unnecessary spaces and lines. This will reduce all your JS & CSS files by up to 80% of their original size, improving your website's loading speed and performance.
Is my code safe when using this tool? +
Yes! All processing happens entirely within your browser. Your code never gets sent to our servers or any external servers. This ensures complete privacy and security for your proprietary code.
What code formats are supported? +
Our tool supports JavaScript (including JSX), CSS (including SCSS and LESS), HTML, XML, and JSON formats. The tool automatically detects the format based on the code structure, but you can also manually select the language for better accuracy.