JavaScript Minifier (Basic)

About this tool

Perform a safe, basic minification of JavaScript by removing comments and collapsing whitespace. For full mangling/optimization use a build tool like Terser.

Example

Input: // note\nvar x = 1;

Output: var x = 1;

Privacy

This tool runs entirely in your browser. Your data is processed locally and never uploaded to a server.

How to use this tool

1. Paste your JavaScript into the input box.
2. Check that the code does not depend on comments for behavior.
3. Click the minify button to remove comments and extra whitespace.
4. Copy the compacted result into your project or build step.

Step by step, what happens

1. The tool reads the JavaScript text you paste in.
2. It removes comments and collapses unnecessary whitespace.
3. It keeps the code structure intact, so normal syntax stays readable to the parser.
4. It returns a shorter version that is safe for basic minification, not full variable mangling.

Worked example

Here is a small script that logs a message and includes both line and block comments.

Input: const name = 'Ada'; // user name /* greet the user */ console.log('Hi ' + name);

1. The tool removes the line comment after the variable declaration.
2. It removes the block comment on the next line.
3. It trims extra line breaks and spaces while keeping the code valid.

Tips and common mistakes

• Do not rely on comments for code that must run, because this tool removes them.
• This is a basic minifier, so it does not rename variables or do advanced optimizations.
• Test the minified output in your app if your code uses tricky syntax, template strings, or regular expressions.
• If you need stronger compression for production bundles, use a build tool like Terser.

Frequently asked questions