Will minifying break my code?

Terser preserves behaviour for standard code. Avoid relying on function or variable names at runtime, since locals get renamed.

Does it produce a source map?

This tool returns minified code only. Use your build pipeline if you need source maps.

JavaScript minifier

Paste JavaScript to minify it with Terser: dead-code removal, variable mangling, and whitespace stripping for a much smaller file. Runs locally.

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What the JS minifier does

It runs your code through Terser, which removes whitespace and comments, drops unreachable code, and renames local variables to shrink the output significantly.

Why minify JavaScript

Smaller scripts download and execute faster. Minification is standard practice for shipping production JavaScript to real users.

Powered by Terser

Terser is the same industry-standard minifier used by major bundlers, so results match what a production build pipeline would produce.

How to javascript minifier

Paste your JavaScript into the input pane.
Click Convert to minify it with Terser.
Copy the compact code or download it as a .js file.

Related converters

JavaScript BeautifierReformat minified or messy JS with Prettier.CSS MinifierStrip comments and whitespace to shrink your CSS.HTML MinifierCollapse whitespace and strip comments to shrink HTML.