What are the benefits of JavaScript Minifier?

Significantly reduces JavaScript file size by removing comments, whitespace, and newlines. Safe compression that preserves string literals and regex patterns without corruption. Does not rename variables, keeping minified code easy to debug and understand. Fully browser-based processing ensures your sensitive code never leaves your machine.

Is JavaScript Minifier free?

Yes, it is completely free to use, and no registration is required. Tool processing happens entirely in your browser, and your input content and uploaded files are not sent to a server. Our first-party improvement metrics use no cookies, visitor IDs, or session IDs and store only normalized page paths and daily counts for fixed event IDs.

JavaScript Minifier

Remove comments and whitespace from JS code to reduce file size

JavaScriptコードを入力

About JavaScript Minifier

The JavaScript Minifier is an online tool for compressing and optimizing JavaScript source code. It automatically removes single-line comments (//), multi-line comments (/* */), collapses consecutive whitespace, and eliminates unnecessary newlines.

Content inside string literals (single quotes, double quotes, and template literals) and regex literals is preserved exactly as-is. Required spaces between keywords and identifiers are automatically maintained, ensuring the minified output remains syntactically valid.

The tool provides a clear before-and-after size comparison showing original size, minified size, bytes saved, and compression percentage — helping you optimize website load times and bundle sizes. With fully client-side processing, you can safely minify sensitive or proprietary code without any data leaving your browser.

How to use JavaScript Minifier

Paste or type your JavaScript code into the input textarea
Click the Minify button to compress the code
Review the minified output and compression statistics (original size, minified size, reduction percentage)
Click the Copy button to copy the minified code to your clipboard

Benefits of JavaScript Minifier

Significantly reduces JavaScript file size by removing comments, whitespace, and newlines
Safe compression that preserves string literals and regex patterns without corruption
Does not rename variables, keeping minified code easy to debug and understand
Fully browser-based processing ensures your sensitive code never leaves your machine