JavaScript Minifier

Minify JavaScript with Terser: strips whitespace and comments, shortens local variable names and applies safe compressions. Runs in your browser.

JavaScript input

Output

Runs entirely in your browser. Your data is never uploaded.

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What is JavaScript Minifier?

The JavaScript Minifier compresses modern JavaScript (ES2015+) with Terser, the minifier used by webpack and Vite. It removes whitespace and comments, renames local variables to short names and simplifies expressions.

How to use JavaScript Minifier

Paste your JavaScript into the input box.
Click Minify (the output also updates while you type).
Check the size line under the output.
Copy or download the minified code.

Example

Input

function add(first, second) {
  return first + second;
}
console.log(add(1, 2));

Output

function add(d,n){return d+n}console.log(add(1,2));

When to use JavaScript Minifier

Use it for small scripts, bookmarklets, inline <script> blocks or quick size checks. For applications, let your bundler minify with source maps. It does not transpile TypeScript or JSX – strip types first.

How JavaScript Minifier works

The code is minified with terser.minify using compress and mangle enabled and all comments removed. Terser parses to an AST, inlines constants, removes dead code and unused variables in local scopes, and renames function-local identifiers. Top-level names are not mangled, so global functions keep their names. Syntax errors are reported with line and column.