Online JS Minifier

Minify and compress JavaScript code to reduce file size and improve website performance

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2,144+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

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About This Tool

This free online JavaScript minifier tool helps developers optimize their JS code by removing unnecessary characters like whitespace, comments, and line breaks. The tool supports various optimization options including mangle variable names, compress expressions, and preserve specific comments. You can either paste your JavaScript code directly or upload .js files. The minified output is immediately available for download or copying, with detailed statistics showing the size reduction achieved.

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How to Use

Paste your JavaScript code into the textarea or upload a .js file using the file upload area
Configure minification options (mangle variables, compress expressions, preserve specific comments)
Click the 'Minify JavaScript' button to process your code
View the minified output in the results section with size statistics
Download the minified code as a .js file or copy it to clipboard

Frequently Asked Questions

Find Quick Answers

What is JavaScript minification?

JavaScript minification is the process of removing unnecessary characters from source code without changing its functionality. This includes removing whitespace, comments, and shortening variable names to reduce file size and improve loading times.

Is my JavaScript code safe with this tool?

Yes, all processing happens entirely in your browser. Your code never leaves your computer or gets sent to any server, ensuring complete privacy and security.

What optimization options are available?

You can choose to mangle variable names (shorten them), compress expressions, and preserve specific comments like license headers or important annotations.

What's the maximum file size I can minify?

There's no strict limit, but very large files may cause browser performance issues. For optimal experience, we recommend files under 5MB.

Does the tool support ES6+ JavaScript features?

Yes, the minifier uses Terser which fully supports modern JavaScript syntax including ES6, ES7, and newer features.

Need to run multiple calculations?

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