JavaScript Minifier & Beautifier

About JavaScript Minifier

This free online JavaScript minifier and beautifier helps you optimize JS for production or format minified code for readability. All processing runs entirely in your browser — no code is sent to any server.

What Does JS Minification Do?

• Removes all comments (single-line // and multi-line /* */)
• Strips unnecessary whitespace, newlines, and indentation
• Preserves string literals, template literals, and regex patterns
• Optionally removes console.log statements
• Typically reduces JavaScript file size by 30-60%

Minification vs Uglification

• Minification (this tool): Removes whitespace and comments. Code remains readable if formatted. No variable renaming.
• Uglification (tools like Terser/UglifyJS): Additionally renames variables, inlines constants, removes dead code, and performs other transformations. More compression but requires build tools.

FAQ

Should I minify my JavaScript?

Yes, for production. Minified JS loads faster and reduces bandwidth costs. Modern build tools (webpack, Vite, esbuild, Rollup) do this automatically. This tool is useful for quick one-off minification or when you don't use a build pipeline.

Does minification break my code?

No. This minifier only removes whitespace and comments — it doesn't change your code's logic, variable names, or structure. The minified code will run exactly the same as the original.

What about source maps?

This tool doesn't generate source maps. For production use with source maps, use a build tool like Terser, esbuild, or webpack's built-in minification. This tool is best for quick minification tasks.