JavaScript Minifier

What Is the JavaScript Minifier?

It compacts JavaScript by removing unnecessary whitespace and blank lines, in your browser.

When to Use It

• To shrink a small script for an embed or inline snippet.
• When you do not have a build tool set up.

How to Use It

1. Paste your JavaScript.
2. Minify and copy the output.

Understanding the Result

The code runs the same way. Comments are kept, because removing them safely requires fully parsing the code - comment-like text can appear inside strings and regular expressions.

Limitations

This is a safe whitespace compactor, not a full minifier: it does not shorten variable names or remove unused code. For production builds use a bundler such as esbuild, Terser or Vite.

Example

function greet(name) {

    const message = 'Hello, ' + name;
    return message;
}

is compacted to fewer lines with indentation and blank lines removed, while every statement stays exactly as written.

Why a "Safe" Minifier?

Real minifiers such as Terser and esbuild parse the whole program before changing it. Tools that remove comments or line breaks with simple patterns can break code - for example, a // inside a URL string, or a line break that JavaScript's automatic semicolon insertion depends on. This tool avoids those risky changes, so the output always behaves like the input.

Minification vs Compression

For a production site, use a bundler and make sure compression is on - check it with the GZIP Checker. To make minified code readable again, use the JavaScript Formatter.