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JavaScript Minifier & Beautifier

Minify JavaScript to reduce file size or beautify compressed JS for readability. Free, client-side, no signup required.

Your data never leaves your browser Available via MCP
Next steps
CSS Minifier → HTML Beautifier → JSON Formatter →

How to Use

  1. Paste your JavaScript into the input panel.
  2. Click Beautify to format with indentation, or Minify to compress.
  3. Select your preferred indentation (2 or 4 spaces).
  4. Click Copy to copy the result.

Why Minify JavaScript?

JavaScript is often the largest render-blocking resource on web pages. Minifying removes comments, whitespace, and unnecessary formatting — typically reducing file size by 30-60%. Combined with gzip compression, total transfer size can drop by 70-80%. This directly impacts Core Web Vitals metrics like Largest Contentful Paint (LCP) and Time to Interactive (TTI).

Minification vs. Bundling vs. Compression

  • Minification — Removes unnecessary characters from source code (this tool)
  • Bundling — Combines multiple files into fewer files (Webpack, Rollup, esbuild)
  • Compression — Server-side encoding like gzip or Brotli that further reduces transfer size
  • Tree shaking — Removes unused exports during bundling

Production Minification Tools

For production builds, use dedicated minifiers integrated into your build pipeline: Terser (the successor to UglifyJS), esbuild (extremely fast, written in Go), or SWC (Rust-based, used by Next.js). These tools perform advanced optimizations like variable renaming, dead code elimination, and constant folding that go beyond whitespace removal.

Related Tools

Minify CSS with the CSS Minifier. Format HTML with the HTML Beautifier. Compare code changes with the Diff Checker. Format JSON output with the JSON Formatter. Test patterns with the Regex Tester. Encode JS for HTML embedding with the HTML Entity Encoder.

Frequently Asked Questions

What does JavaScript minification do?
JavaScript minification removes whitespace, comments, and unnecessary characters from your code without changing its behavior. This reduces file size, leading to faster downloads and page loads.
Will minification break my JavaScript?
Basic minification (whitespace and comment removal) does not change functionality. However, this is a lightweight minifier — for production use with advanced optimizations like variable renaming and dead code elimination, use build tools like Terser or esbuild.
What does the beautifier do?
The beautifier reformats compressed JavaScript into readable code with proper indentation, line breaks after statements, and consistent spacing around braces and brackets.
Is my data safe?
Yes. All processing happens entirely in your browser. No JavaScript code is sent to any server.

Code Examples

Learn how to use this tool programmatically in your favorite language.

Minify JavaScript

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CSS Minifier & Beautifier

Minify CSS to reduce file size or beautify for readability.

TOML Formatter & Converter

Format, minify, and convert TOML data with bidirectional JSON conversion.

Use this tool from AI agents. The CodeTidy MCP Server lets Claude, Cursor, and other AI agents use this tool and 46 others directly. One command: npx @codetidy/mcp

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