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JavaScript Minifier

Minify and compress JavaScript for production.

PDF & Document ToolsBrowser-only • PrivateFree

JavaScript Input

Minified JS

Output will appear here...

Privacy First: All processing happens locally in your browser. Your data never leaves your device and is never uploaded to any server.

About JavaScript Minifier

The JavaScript Minifier shrinks your code by removing comments, whitespace, and line breaks, producing compact JS that downloads and parses faster in production. Smaller scripts mean quicker page loads and better performance scores. Minification runs locally in your browser with nothing uploaded. To make the code readable again, use the JavaScript Formatter, and minify your styles with the CSS Minifier.

How to Use

1Open JavaScript Minifier and paste or type your data into the input area.
2Adjust any available options to match the result you want.
3Your output is generated instantly — no button-clicking required for most tools.
4Use the Copy or Download button to save your result.

Common Use Cases

Previewing markdown and HTML before publishing
Formatting and minifying CSS, JavaScript, and HTML
Converting between markdown and HTML for docs and CMSs
Cleaning up code snippets for readability

Frequently Asked Questions

Is minified JavaScript still valid?

Yes. Minification only removes characters that don't change meaning, so the compressed script runs identically to the original while taking up less space.

Should I minify during my build instead?

For a full project, a build tool that also mangles names is ideal. This tool is perfect for quick one-off minification of a snippet or a small file without setting up tooling.

Is JavaScript Minifier free to use?

Yes. JavaScript Minifier is completely free with no sign-up, no subscription, and no usage limits. Every tool on CodeUtilityKit is free forever.

Is my data safe when I use JavaScript Minifier?

Absolutely. JavaScript Minifier runs entirely in your browser. Your input is processed locally with JavaScript and is never sent to, stored on, or logged by any server — so it is safe even for private or sensitive data.