What does the JS Minifier do?

It removes single-line comments (//) and multi-line comments (/* */), then collapses consecutive whitespace. The result is a smaller file with the same runtime behaviour for most code.

Is this a full minifier like Terser or UglifyJS?

No — this is a lightweight basic minifier. It does not rename variables, remove dead code, or perform tree-shaking. Use it for quick size reduction without a build step.

Can it break my JavaScript?

In rare cases: regular expressions containing // may be affected, and strings with /* or */ patterns are handled conservatively. Always test the output before using in production.

Does it handle ES6+ syntax?

Yes — the minifier works on any valid JavaScript text. It does not parse the AST, so modern syntax like arrow functions, template literals, and optional chaining are preserved unchanged.

Is my code sent to a server?

No — minification runs entirely in your browser. Your code is never transmitted anywhere.

JS Minifier

Strip comments and collapse whitespace from JavaScript to reduce file size. Basic minification — no variable renaming. Runs entirely in your browser.

Your files never leave your device

Basic minification — removes comments and whitespace. Does not rename variables or perform tree-shaking. Always test the output before using in production.

Input JavaScript

Minified JS

How to JS Minifier

Paste your JavaScript into the input area.
The minified output appears instantly with the bytes saved shown above.
Click "Copy JS" to copy the result to your clipboard.
Or click "Download .js" to save the minified file.

Why Use This Tool?

Reducing JavaScript file size improves page load performance. This tool performs safe comment and whitespace removal — no variable renaming or dead code elimination — making it safe to use without a build pipeline.

JS Minifier

How to JS Minifier

Why Use This Tool?

Frequently Asked Questions