JavaScript Minifier

Minify JavaScript online with Terser — remove whitespace and comments, mangle variable names and compress code. Shows byte savings.

JavaScript input

function greet(name) {
  // Say hello politely
  const message = 'Hello, ' + name + '!';
  console.log(message);
  return message;
}

greet('world');

Mangle names

Compress

About JavaScript Minifier

Paste JavaScript to shrink it with Terser — the industry-standard minifier used by webpack and Rollup — with optional name mangling and compression passes.

The minification runs entirely in your browser and reports the byte reduction, so proprietary code never leaves your machine.