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JavaScript Minifier & Beautifier

Minify or beautify JavaScript code instantly in your browser — free online JS compressor and formatter.

Free JavaScript Minifier & Beautifier

Paste any JavaScript code into the field above and click Beautify to get nicely indented, readable output. Use Minify to strip whitespace, line breaks, and comments for production-ready scripts. This free online JavaScript minifier works entirely in your browser — no code is sent to any server.

What Is JavaScript Minification?

JavaScript minification is the process of removing all unnecessary characters from a script — including whitespace, line breaks, comments, and block delimiters — without changing its functionality. The resulting file is smaller, which means faster downloads, lower bandwidth costs, and improved page load times. JS minification is a standard step in any production build pipeline and is recommended by Google PageSpeed Insights, Lighthouse, and WebPageTest.

What Does JavaScript Beautification Do?

JavaScript beautification (also called JS formatting or pretty-printing) takes minified or obfuscated code and restores consistent indentation, line breaks, and spacing to make it human-readable. This is invaluable when debugging production bundles, reviewing third-party scripts, or auditing a codebase for security issues.

How to Use This JavaScript Minifier

  1. Paste your JavaScript code into the input field — minified, beautified, or anything in between.
  2. Click Beautify for readable, indented output, or Minify for compact production code.
  3. Copy the result with the copy button and use it in your project.

Common Uses

  • Minifying JavaScript files before deploying to production for faster page loads
  • Beautifying minified code from CDNs and bundlers like Webpack or Vite for debugging
  • Removing inline comments from shared or open-source JavaScript libraries
  • Reducing JS bundle size for better Core Web Vitals and Lighthouse scores
  • Formatting code snippets copied from browser DevTools for documentation

Frequently Asked Questions

What's the difference between minifying and beautifying?
Minifying removes all unnecessary characters (whitespace, comments, line breaks) to create the smallest possible file size for production. Beautifying (or prettifying) adds proper indentation and formatting to make minified code readable again for debugging.
Why should I minify JavaScript?
Minified JavaScript loads faster and uses less bandwidth. Smaller files mean quicker page loads, reduced server costs, and better user experience — especially important for mobile users and those on slow connections.
Does minification affect code functionality?
No. Minification only removes whitespace and comments, and may shorten variable names in advanced minifiers. The code logic and behavior remain identical. However, line numbers in error stack traces will differ from the original source.
Can I debug minified code?
Debugging minified code is difficult due to everything being on one line with meaningless variable names. Use source maps in production to map the minified code back to its original source for easier debugging. For quick inspection, use this tool to beautify the code first.
What formatting options are available?
When beautifying, you can typically customize: indentation size (tabs vs. spaces), maximum line length, brace style (same line vs. new line), and whether to preserve or normalize quotes. This tool provides sensible defaults for readable output.
Is this tool secure?
Yes. All processing happens entirely in your browser. Your JavaScript code is never sent to any server. For proprietary code or sensitive logic, this local processing ensures your source code stays private.

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