JavaScript Minifier & Beautifier

About this tool

This JavaScript Minifier & Beautifier is a simple, private way to clean up code. It runs entirely in your browser, so nothing you paste is uploaded or shared. Use it when you want to compress code for faster delivery, or when you need to format JavaScript to make it readable again.

Minifying JavaScript means removing parts of the file that humans use but browsers do not need, such as extra spaces, line breaks, and most comments. The goal is a smaller file size and quicker downloads. Beautifying is the opposite: it restores indentation and consistent spacing so the logic is easier to follow. This tool uses a careful tokenizer to avoid changing strings, regular-expression literals, or template literals, which helps preserve behavior while still shrinking or formatting the code.

To use the calculator, paste your code into the input box, choose the mode (Minify or Beautify), and set the options you prefer. Then run the tool and copy the result from the output area. For quick workflows, press Ctrl/Cmd + Enter to run Minify. Your last input is kept locally in the browser so you can pick up where you left off.

Options let you control how aggressive the formatting is. For example, you can remove comments to reduce size, keep license banners if you need to preserve legal headers, collapse whitespace for a tighter bundle, and insert safe semicolons in tricky edge cases where JavaScript’s automatic semicolon insertion could change meaning.

Typical uses

• Compress a script before adding it to a website or embedding it in an HTML file.
• Beautify a minified library to review or debug it during development.
• Quickly format JavaScript snippets for documentation, tutorials, or code reviews.
• Clean up pasted code so it is consistent before committing it to a project.

Whether you need a JavaScript compressor, a code formatter, or a quick JS beautifier, this tool helps you go from messy or bulky code to clean, readable, or smaller output in seconds.

FAQ