JS Minifier/Beautifier

Minify and beautify JavaScript with comment stripping and gzip sizing.

Input: 202 BOutput: 143 B

JavaScript Input

Output

function greet(name) {
const message = "Hello, " + name + "!";
console.log(message);
return message;
}
const users = [1, 2, 3].map(n => n * 2);

Conservative minifier: strips comments and collapses whitespace without renaming identifiers. Gzip size uses the browser's native CompressionStream. Validation runs code in a throwaway Function — safe for non-executing checks.

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Minify and beautify JavaScript without changing semantics. Strips comments, collapses whitespace, validates with the browser parser, and estimates gzip size.

[x]Features

-Comment stripping (line and block)
-Whitespace collapsing with string safety
-Beautifier with proper indentation
-Syntax validation via the browser parser
-Gzip size estimate using CompressionStream
-Download minified output as .js file

>Use Cases

>Reducing asset size before publishing
>Preparing minified snippets for CDN inline scripts
>Cleaning up generated or compiled JavaScript for review
>Checking how much compression gzip adds

Frequently Asked Questions

>How aggressive is the minification??

Conservative. Comments are stripped and whitespace is collapsed, but identifiers and line structure are preserved, so the output is always safe and never changes semantics.

>Can it compress ES modules or modern syntax??

It works on any valid JavaScript, including modern syntax, since validation uses the browser's own parser.