Code Minifier - Minify JavaScript, CSS, HTML Online

Last updated March 22, 2026

Code Minification Overview

Code minification removes unnecessary characters from source code — whitespace, comments, and long variable names — without changing functionality. The result is smaller files that load faster. Minification is a standard step in web build pipelines for JavaScript, CSS, and HTML.

Minification by Language

JavaScript Minification with Terser

import { minify } from 'terser';

const code = `
  // Calculate factorial recursively
  function factorial(n) {
    if (n <= 1) return 1;
    return n * factorial(n - 1);
  }
  console.log(factorial(10));
`;

const result = await minify(code, {
  compress: {
    dead_code: true,
    drop_console: false,
    passes: 2
  },
  mangle: {
    toplevel: true
  },
  format: {
    comments: false
  }
});

console.log(result.code);
// → function n(r){return r<=1?1:r*n(r-1)}console.log(n(10));